blocks|key|292530|text|我能想到两个答案。两者都不像只有一个连接运算符那么令人愉快。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|292531|首先，使用具有appendString方法的NSMutableString，消除了对额外temp字符串的一些需要。|offset|length|style|CODE|292532|其次，使用NSArray通过componentsJoinedByString方法进行连接。|292533|entityMap^0|0|7|C|M|F|0|5|7|E|O|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@$D|S|E|T|F|G]|$D|U|E|V|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|K|$]]

Two answers I can think of... neither is particularly as pleasant as just having a concatenation operator.

First, use an <code>NSMutableString</code>, which has an <code>appendString</code> method, removing some of the need for extra temp strings.

Second, use an <code>NSArray</code> to concatenate via the <code>componentsJoinedByString</code> method.

blocks|key|3509908|text|使c+=+[a+stringByAppendingString:+b]更短的唯一方法是在st点附近使用autocomplete。%2B操作符是C的一部分，它不知道Objective-C对象。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3509909|entityMap^0|1|Y|18|2|1S|1|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

The only way to make <code>c = [a stringByAppendingString: b]</code> any shorter is to use autocomplete at around the <code>st</code> point. The <code>+</code> operator is part of C, which doesn't know about Objective-C objects.

blocks|key|3509928|text|一个选项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3509929|[NSString+stringWithFormat:@"%25@/%25@/%25@",+one,+two,+three];|code-block|syntax|javascript|3509930|另一种选择：|3509931|我猜您对多重追加(a%2Bb%2Bc%2Bd)不满意，在这种情况下，您可以这样做：|3509932|NSLog(@"%25@",+[Util+append:one,+@"+",+two,+nil]);+//+"one+two"
NSLog(@"%25@",+[Util+append:three,+@"/",+two,+@"/",+one,+nil]);+//+three/two/one|3509933|使用像这样的东西|3509934|%2B+(NSString+*)+append:(id)+first,+...
{
++++NSString+*+result+=+@"";
++++id+eachArg;
++++va_list+alist;
++++if(first)
++++{
++++++++result+=+[result+stringByAppendingString:first];
++++++++va_start(alist,+first);
++++++++while+(eachArg+=+va_arg(alist,+id))+
++++++++result+=+[result+stringByAppendingString:eachArg];
++++++++va_end(alist);
++++}
++++return+result;
}|3509935|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<h2>An option:</h2>

<pre><code>[NSString stringWithFormat:@"%@/%@/%@", one, two, three];
</code></pre>

<h2>Another option:</h2>

I'm guessing you're not happy with multiple appends (a+b+c+d), in which case you could do:

<pre><code>NSLog(@"%@", [Util append:one, @" ", two, nil]); // "one two"
NSLog(@"%@", [Util append:three, @"/", two, @"/", one, nil]); // three/two/one
</code></pre>

using something like

<pre><code>+ (NSString *) append:(id) first, ...
{
 NSString * result = @"";
 id eachArg;
 va_list alist;
 if(first)
 {
 result = [result stringByAppendingString:first];
 va_start(alist, first);
 while (eachArg = va_arg(alist, id)) 
 result = [result stringByAppendingString:eachArg];
 va_end(alist);
 }
 return result;
}
</code></pre>

blocks|key|292578|text|NSString+*label1+=+@"Process+Name:+";
NSString+*label2+=+@"Process+Id:+";
NSString+*processName+=+[[NSProcessInfo+processInfo]+processName];
NSString+*processID+=+[NSString+stringWithFormat:@"%25d",+[[NSProcessInfo+processInfo]+processIdentifier]];
NSString+*testConcat+=+[NSString+stringWithFormat:@"%25@+%25@+%25@+%25@",+label1,+processName,+label2,+processID];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|292579|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>NSString *label1 = @"Process Name: ";
NSString *label2 = @"Process Id: ";
NSString *processName = [[NSProcessInfo processInfo] processName];
NSString *processID = [NSString stringWithFormat:@"%d", [[NSProcessInfo processInfo] processIdentifier]];
NSString *testConcat = [NSString stringWithFormat:@"%@ %@ %@ %@", label1, processName, label2, processID];
</code></pre>

blocks|key|292585|text|NSString+*label1+=+@"Process+Name:+";
NSString+*label2+=+@"Process+Id:+";
NSString+*processName+=+[[NSProcessInfo+processInfo]+processName];
NSString+*processID+=+[NSString+stringWithFormat:@"%25d",+[[NSProcessInfo+processInfo]+processIdentifier]];
NSString+*testConcat+=+[NSString+stringWithFormat:@"%25@+%25@+%25@+%25@",+label1,+processName,+label2,+processID];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|292586|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

blocks|key|3509963|text|按如下方式使用stringByAppendingString:：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3509964|NSString+*string1,+*string2,+*result;

string1+=+@"This+is+";
string2+=+@"my+string.";

result+=+[result+stringByAppendingString:string1];
result+=+[result+stringByAppendingString:string2];|code-block|syntax|javascript|3509965|或|3509966|result+=+[result+stringByAppendingString:@"This+is+"];
result+=+[result+stringByAppendingString:@"my+string."];|3509967|entityMap^0|7|O|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

Use <code>stringByAppendingString:</code> this way:

<pre><code>NSString *string1, *string2, *result;

string1 = @"This is ";
string2 = @"my string.";

result = [result stringByAppendingString:string1];
result = [result stringByAppendingString:string2];
</code></pre>

OR

<pre><code>result = [result stringByAppendingString:@"This is "];
result = [result stringByAppendingString:@"my string."];
</code></pre>

blocks|key|292644|text|如果你有2个NSString+，你也可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|292645|NSString+*joinedFromLiterals+=+@"ONE+"+@"MILLION+"+@"YEARS+"+@"DUNGEON!!!";|code-block|syntax|javascript|292646|这对于加入#defines也很有用：|292647|#define+STRINGA+@"Also,+I+don't+know+"
#define+STRINGB+@"where+food+comes+from."
#define+JOINED+STRINGA+STRINGB|292648|好好享受吧。|292649|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you have 2 NSString literals, you can also just do this:

<pre><code>NSString *joinedFromLiterals = @"ONE " @"MILLION " @"YEARS " @"DUNGEON!!!";
</code></pre>

That's also useful for joining #defines:

<pre><code>#define STRINGA @"Also, I don't know "
#define STRINGB @"where food comes from."
#define JOINED STRINGA STRINGB
</code></pre>

Enjoy.

blocks|key|3510054|text|这是为了更好地记录日志，并且只记录日志-基于dicius优秀的多参数方法。我定义了一个Logger类，并这样调用它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3510055|[Logger+log:+@"foobar+",+@"+asdads+",+theString,+nil];|code-block|syntax|javascript|3510056|几乎很好，除了必须以"nil“结束var参数之外，但我想在Objective-C中没有办法绕过这一点。|3510057|Logger.h|3510058|@interface+Logger+:+NSObject+{
}
%2B+(void)+log:+(id)+first,+...;
@end|3510059|Logger.m|3510060|@implementation+Logger

%2B+(void)+log:+(id)+first,+...
{
++++//+TODO:+make+efficient;+handle+arguments+other+than+strings
++++//+thanks+to+@diciu+http://stackoverflow.com/questions/510269/how-do-i-concatenate-strings-in-objective-c
++++NSString+*+result+=+@"";
++++id+eachArg;
++++va_list+alist;
++++if(first)
++++{
++++++++result+=+[result+stringByAppendingString:first];
++++++++va_start(alist,+first);
++++++++while+(eachArg+=+va_arg(alist,+id))+
++++++++{
++++++++++++result+=+[result+stringByAppendingString:eachArg];
++++++++}
++++++++va_end(alist);
++++}
++++NSLog(@"%25@",+result);
}

@end+|3510061|为了只连接字符串，我在NSString上定义了一个Category，并为它添加了一个静态(%2B)连接方法，该方法看起来与上面的方法完全一样，只是它返回字符串。它在NSString上，因为它是一个字符串方法，它是静态的，因为您想从1-N个字符串中创建一个新字符串，而不是在附加中的任何一个字符串上调用它。|offset|length|style|BOLD|3510062|entityMap^0|0|0|0|0|0|0|0|1Q|2G|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|15|8|@$S|16|T|17|U|V]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

This is for better logging, and logging only - based on dicius excellent multiple argument method. I define a Logger class, and call it like so:

<pre><code>[Logger log: @"foobar ", @" asdads ", theString, nil];
</code></pre>

Almost good, except having to end the var args with "nil" but I suppose there's no way around that in Objective-C.

Logger.h

<pre><code>@interface Logger : NSObject {
}
+ (void) log: (id) first, ...;
@end
</code></pre>

Logger.m

<pre><code>@implementation Logger

+ (void) log: (id) first, ...
{
 // TODO: make efficient; handle arguments other than strings
 // thanks to @diciu http://stackoverflow.com/questions/510269/how-do-i-concatenate-strings-in-objective-c
 NSString * result = @"";
 id eachArg;
 va_list alist;
 if(first)
 {
 result = [result stringByAppendingString:first];
 va_start(alist, first);
 while (eachArg = va_arg(alist, id)) 
 {
 result = [result stringByAppendingString:eachArg];
 }
 va_end(alist);
 }
 NSLog(@"%@", result);
}

@end 
</code></pre>

In order to only concat strings, I'd define a Category on NSString and add a static (+) concatenate method to it that looks exactly like the log method above except it returns the string. It's on NSString because it's a string method, and it's static because you want to create a new string from 1-N strings, not call it on any one of the strings that are part of the append.

blocks|key|1009218|text|创建一个方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1009219|-+(NSString+*)strCat:+(NSString+*)one:+(NSString+*)two
{
++++NSString+*myString;
++++myString+=+[NSString+stringWithFormat:@"%25@%25@",+one+,+two];
++++return+myString;
}|code-block|syntax|javascript|1009220|然后，在您需要它的任何函数中，将字符串或文本字段或其他任何内容设置为此函数的返回值。|1009221|或者，要创建快捷方式，请将NSString转换为C%2B%2B字符串并在其中使用“%2B”。|1009222|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Create a method:

<pre><code>- (NSString *)strCat: (NSString *)one: (NSString *)two
{
 NSString *myString;
 myString = [NSString stringWithFormat:@"%@%@", one , two];
 return myString;
}
</code></pre>

Then, in whatever function you need it in, set your string or text field or whatever to the return value of this function.

Or, to make a shortcut, convert the NSString into a C++ string and use the '+' there.

blocks|key|3510140|text|嗯，由于冒号是一种特殊的符号，但它是方法签名的一部分，所以可以扩展带有category的NSString来添加这种非惯用的样式的字符串连接：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|3510141|[@"This+"+:+@"feels+"+:+@"almost+like+"+:+@"concatenation+with+operators"];|code-block|syntax|javascript|3510142|您可以根据需要定义任意多个冒号分隔的参数...;-)|3510143|另外，我还添加了带有变量参数的concat:，该参数接受以nil结尾的字符串列表。|3510144|//++NSString%2BConcatenation.h

#import+<Foundation/Foundation.h>

@interface+NSString+(Concatenation)

-+(NSString+*):(NSString+*)a;
-+(NSString+*):(NSString+*)a+:(NSString+*)b;
-+(NSString+*):(NSString+*)a+:(NSString+*)b+:(NSString+*)c;
-+(NSString+*):(NSString+*)a+:(NSString+*)b+:(NSString+*)c+:(NSString+*)d;

-+(NSString+*)concat:(NSString+*)strings,+...;

@end

//++NSString%2BConcatenation.m

#import+"NSString%2BConcatenation.h"

@implementation+NSString+(Concatenation)

-+(NSString+*):(NSString+*)a+{+return+[self+stringByAppendingString:a];}
-+(NSString+*):(NSString+*)a+:(NSString+*)b+{+return+[[self:a]:b];}
-+(NSString+*):(NSString+*)a+:(NSString+*)b+:(NSString+*)c
++++{+return+[[[self:a]:b]:c];+}
-+(NSString+*):(NSString+*)a+:(NSString+*)b+:(NSString+*)c+:(NSString+*)d
++++{+return+[[[[self:a]:b]:c]:d];}

-+(NSString+*)concat:(NSString+*)strings,+...
{
++++va_list+args;
++++va_start(args,+strings);

++++NSString+*s;++++
++++NSString+*con+=+[self+stringByAppendingString:strings];

++++while((s+=+va_arg(args,+NSString+*)))+
++++++++con+=+[con+stringByAppendingString:s];

++++va_end(args);
++++return+con;
}
@end

//++NSString%2BConcatenationTest.h

#import+<SenTestingKit/SenTestingKit.h>
#import+"NSString%2BConcatenation.h"

@interface+NSString_ConcatenationTest+:+SenTestCase

@end

//++NSString%2BConcatenationTest.m

#import+"NSString%2BConcatenationTest.h"

@implementation+NSString_ConcatenationTest

-+(void)testSimpleConcatenation+
{
++++STAssertEqualObjects([@"a":@"b"],+@"ab",+nil);
++++STAssertEqualObjects([@"a":@"b":@"c"],+@"abc",+nil);
++++STAssertEqualObjects([@"a":@"b":@"c":@"d"],+@"abcd",+nil);
++++STAssertEqualObjects([@"a":@"b":@"c":@"d":@"e"],+@"abcde",+nil);
++++STAssertEqualObjects([@"this+"+:+@"is+"+:+@"string+"+:+@"concatenation"],
+++++@"this+is+string+concatenation",+nil);
}

-+(void)testVarArgConcatenation+
{
++++NSString+*concatenation+=+[@"a"+concat:@"b",+nil];
++++STAssertEqualObjects(concatenation,+@"ab",+nil);

++++concatenation+=+[concatenation+concat:@"c",+@"d",+concatenation,+nil];
++++STAssertEqualObjects(concatenation,+@"abcdab",+nil);
}|3510145|entityMap^0|18|8|1L|4|0|0|0|F|7|T|3|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|Y|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|Z|8|@]|E|@]|F|$]]|$1|N|3|O|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|E|@]|F|$]]|$1|P|3|Q|5|I|7|15|8|@]|E|@]|F|$J|K]]|$1|R|3|-4|5|6|7|16|8|@]|E|@]|F|$]]]|S|$]]

Well, as colon is kind of special symbol, but is part of method signature, it is possible to exted the <code>NSString</code> with category to add this non-idiomatic style of string concatenation:

<pre><code>[@"This " : @"feels " : @"almost like " : @"concatenation with operators"];
</code></pre>

You can define as many colon separated arguments as you find useful... ;-)

For a good measure, I've also added <code>concat:</code> with variable arguments that takes <code>nil</code> terminated list of strings. 

<pre><code>// NSString+Concatenation.h

#import &lt;Foundation/Foundation.h&gt;

@interface NSString (Concatenation)

- (NSString *):(NSString *)a;
- (NSString *):(NSString *)a :(NSString *)b;
- (NSString *):(NSString *)a :(NSString *)b :(NSString *)c;
- (NSString *):(NSString *)a :(NSString *)b :(NSString *)c :(NSString *)d;

- (NSString *)concat:(NSString *)strings, ...;

@end

// NSString+Concatenation.m

#import "NSString+Concatenation.h"

@implementation NSString (Concatenation)

- (NSString *):(NSString *)a { return [self stringByAppendingString:a];}
- (NSString *):(NSString *)a :(NSString *)b { return [[self:a]:b];}
- (NSString *):(NSString *)a :(NSString *)b :(NSString *)c
 { return [[[self:a]:b]:c]; }
- (NSString *):(NSString *)a :(NSString *)b :(NSString *)c :(NSString *)d
 { return [[[[self:a]:b]:c]:d];}

- (NSString *)concat:(NSString *)strings, ...
{
 va_list args;
 va_start(args, strings);

 NSString *s; 
 NSString *con = [self stringByAppendingString:strings];

 while((s = va_arg(args, NSString *))) 
 con = [con stringByAppendingString:s];

 va_end(args);
 return con;
}
@end

// NSString+ConcatenationTest.h

#import &lt;SenTestingKit/SenTestingKit.h&gt;
#import "NSString+Concatenation.h"

@interface NSString_ConcatenationTest : SenTestCase

@end

// NSString+ConcatenationTest.m

#import "NSString+ConcatenationTest.h"

@implementation NSString_ConcatenationTest

- (void)testSimpleConcatenation 
{
 STAssertEqualObjects([@"a":@"b"], @"ab", nil);
 STAssertEqualObjects([@"a":@"b":@"c"], @"abc", nil);
 STAssertEqualObjects([@"a":@"b":@"c":@"d"], @"abcd", nil);
 STAssertEqualObjects([@"a":@"b":@"c":@"d":@"e"], @"abcde", nil);
 STAssertEqualObjects([@"this " : @"is " : @"string " : @"concatenation"],
 @"this is string concatenation", nil);
}

- (void)testVarArgConcatenation 
{
 NSString *concatenation = [@"a" concat:@"b", nil];
 STAssertEqualObjects(concatenation, @"ab", nil);

 concatenation = [concatenation concat:@"c", @"d", concatenation, nil];
 STAssertEqualObjects(concatenation, @"abcdab", nil);
}
</code></pre>

blocks|key|4357891|text|在构建对web服务的请求时，我发现这样做非常容易，并使连接在Xcode中可读：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4357892|NSString*+postBody+=+{
++++@"<?xml+version=\"1.0\"+encoding=\"utf-8\"?>"
++++@"<soap:Envelope+xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"+xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\"+xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
++++@"+<soap:Body>"
++++@"++<WebServiceMethod+xmlns=\"\">"
++++@"+++<parameter>test</parameter>"
++++@"++</WebServiceMethod>"
++++@"+</soap:Body>"
++++@"</soap:Envelope>"
};|code-block|syntax|javascript|4357893|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

When building requests for web services, I find doing something like the following is very easy and makes concatenation readable in Xcode:

<pre><code>NSString* postBody = {
 @"&lt;?xml version=\"1.0\" encoding=\"utf-8\"?&gt;"
 @"&lt;soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\"&gt;"
 @" &lt;soap:Body&gt;"
 @" &lt;WebServiceMethod xmlns=\"\"&gt;"
 @" &lt;parameter&gt;test&lt;/parameter&gt;"
 @" &lt;/WebServiceMethod&gt;"
 @" &lt;/soap:Body&gt;"
 @"&lt;/soap:Envelope&gt;"
};
</code></pre>

blocks|key|3510280|text|如何缩短stringByAppendingString并使用#define|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|3510281|#define+and+stringByAppendingString|code-block|syntax|javascript|3510282|因此，您将使用：|3510283|NSString*+myString+=+[@"Hello+"+and+@"world"];|3510284|问题是它只适用于两个字符串，你需要对更多的追加使用额外的括号：|3510285|NSString*+myString+=+[[@"Hello"+and:+@"+world"]+and:+@"+again"];|3510286|entityMap^0|4|N|U|7|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|10|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|11|8|@]|E|@]|F|$]]|$1|N|3|O|5|I|7|12|8|@]|E|@]|F|$J|K]]|$1|P|3|Q|5|6|7|13|8|@]|E|@]|F|$]]|$1|R|3|S|5|I|7|14|8|@]|E|@]|F|$J|K]]|$1|T|3|-4|5|6|7|15|8|@]|E|@]|F|$]]]|U|$]]

How about shortening <code>stringByAppendingString</code> and use a #define:

<pre><code>#define and stringByAppendingString
</code></pre>

Thus you would use:

<pre><code>NSString* myString = [@"Hello " and @"world"];
</code></pre>

Problem is that it only works for two strings, you're required to wrap additional brackets for more appends:

<pre><code>NSString* myString = [[@"Hello" and: @" world"] and: @" again"];
</code></pre>

blocks|key|4358034|text|我不断地返回到这篇文章，最后总是通过对答案进行排序，找到这个简单的解决方案，它可以根据需要使用尽可能多的变量：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4358035|[NSString+stringWithFormat:@"%25@/%25@/%25@",+three,+two,+one];|code-block|syntax|javascript|4358036|例如：|4358037|NSString+*urlForHttpGet+=+[NSString+stringWithFormat:@"http://example.com/login/username/%25@/userid/%25i",+userName,+userId];|4358038|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I keep returning to this post and always end up sorting through the answers to find this simple solution that works with as many variables as needed:

<pre><code>[NSString stringWithFormat:@"%@/%@/%@", three, two, one];
</code></pre>

For example:

<pre><code>NSString *urlForHttpGet = [NSString stringWithFormat:@"http://example.com/login/username/%@/userid/%i", userName, userId];
</code></pre>

blocks|key|1009372|text|下面是一个简单的方法，使用新的数组文字语法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1009373|NSString+*+s+=+[@[@"one+",+@"two+",+@"three"]+componentsJoinedByString:@""];
++++++++++++++++++%5E%5E%5E%5E%5E%5E%5E+create+array+%5E%5E%5E%5E%5E
+++++++++++++++++++++++++++++++++++++++++++++++%5E%5E%5E%5E%5E%5E%5E+concatenate+%5E%5E%5E%5E%5E|code-block|syntax|javascript|1009374|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a simple way, using the new array literal syntax:

<pre><code>NSString * s = [@[@"one ", @"two ", @"three"] componentsJoinedByString:@""];
 ^^^^^^^ create array ^^^^^
 ^^^^^^^ concatenate ^^^^^
</code></pre>

blocks|key|1009383|text|试试stringWithFormat：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1009384|NSString+*myString+=+[NSString+stringWithFormat:@"%25@+%25@+%25@+%25d",+"The",+"Answer",+"Is",+42];|code-block|syntax|javascript|1009385|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try stringWithFormat:

<pre><code>NSString *myString = [NSString stringWithFormat:@"%@ %@ %@ %d", "The", "Answer", "Is", 42];
</code></pre>

blocks|key|4358121|text|在经常处理字符串时，我发现将源文件转换为ObjC%2B%2B更容易，然后我可以使用问题中所示的第二种方法连接std：：string。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4358122|std::string+stdstr+=+[nsstr+UTF8String];

//easier+to+read+and+more+portable+string+manipulation+goes+here...

NSString*+nsstr+=+[NSString+stringWithUTF8String:stdstr.c_str()];|code-block|syntax|javascript|4358123|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

When dealing with strings often I find it easier to make the source file ObjC++, then I can concatenate std::strings using the second method shown in the question.

<pre><code>std::string stdstr = [nsstr UTF8String];

//easier to read and more portable string manipulation goes here...

NSString* nsstr = [NSString stringWithUTF8String:stdstr.c_str()];
</code></pre>

blocks|key|1009403|text|listOfCatalogIDs+=[@[@"id[]=",listOfCatalogIDs]+componentsJoinedByString:@""];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1009404|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>listOfCatalogIDs =[@[@"id[]=",listOfCatalogIDs] componentsJoinedByString:@""];
</code></pre>

blocks|key|3510489|text|您可以使用NSArray作为|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3510490|NSString+*string1=@"This"

NSString+*string2=@"is+just"

NSString+*string3=@"a+test"++

NSArray+*myStrings+=+[[NSArray+alloc]+initWithObjects:string1,+string2,+string3,nil];

NSString+*fullLengthString+=+[myStrings+componentsJoinedByString:@"+"];|code-block|syntax|javascript|3510491|或|3510492|您可以使用|3510493|NSString+*imageFullName=[NSString+stringWithFormat:@"%25@+%25@+%25@.",+string1,string2,string3];|3510494|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can use NSArray as

<pre><code>NSString *string1=@"This"

NSString *string2=@"is just"

NSString *string3=@"a test" 

NSArray *myStrings = [[NSArray alloc] initWithObjects:string1, string2, string3,nil];

NSString *fullLengthString = [myStrings componentsJoinedByString:@" "];
</code></pre>

or

you can use 

<pre><code>NSString *imageFullName=[NSString stringWithFormat:@"%@ %@ %@.", string1,string2,string3];
</code></pre>

blocks|key|3510496|text|NSString+*result=[NSString+stringWithFormat:@"%25@+%25@",+@"Hello",+@"World"];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3510497|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>NSString *result=[NSString stringWithFormat:@"%@ %@", @"Hello", @"World"];
</code></pre>

blocks|key|293198|text|我更喜欢的方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|293199|NSString+*firstString+=+@"foo";
NSString+*secondString+=+@"bar";
NSString+*thirdString+=+@"baz";

NSString+*joinedString+=+[@[firstString,+secondString,+thirdString]+join];|code-block|syntax|javascript|293200|您可以通过将join方法添加到带有类别的NSArray中来实现：|293201|#import+"NSArray%2BJoin.h"
@implementation+NSArray+(Join)
-(NSString+*)join
{
++++return+[self+componentsJoinedByString:@""];
}
@end|293202|这是NSArray的简短定义，我认为这是连接字符串的最快方法。|offset|length|style|CODE|293203|如果您不想使用该类别，请直接使用componentsJoinedByString:方法：|293204|NSString+*joinedString+=+[@[firstString,+secondString,+thirdString]+componentsJoinedByString:@""];|293205|entityMap^0|0|0|0|0|2|7|0|G|P|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@$M|11|N|12|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@$M|14|N|15|O|P]]|9|@]|A|$]]|$1|S|3|T|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

My preferred method is this:

<pre><code>NSString *firstString = @"foo";
NSString *secondString = @"bar";
NSString *thirdString = @"baz";

NSString *joinedString = [@[firstString, secondString, thirdString] join];
</code></pre>

You can achieve it by adding the join method to NSArray with a category:

<pre><code>#import "NSArray+Join.h"
@implementation NSArray (Join)
-(NSString *)join
{
 return [self componentsJoinedByString:@""];
}
@end
</code></pre>

<code>@[]</code> it's the short definition for <code>NSArray</code>, I think this is the fastest method to concatenate strings.

If you don't want to use the category, use directly the <code>componentsJoinedByString:</code> method:

<pre><code>NSString *joinedString = [@[firstString, secondString, thirdString] componentsJoinedByString:@""];
</code></pre>

blocks|key|293253|text|我试过这个代码。这对我很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|293254|NSMutableString+*+myString=[[NSMutableString+alloc]init];
myString=[myString+stringByAppendingString:@"first+value"];
myString=[myString+stringByAppendingString:@"second+string"];|code-block|syntax|javascript|293255|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I tried this code. it's worked for me.

<pre><code>NSMutableString * myString=[[NSMutableString alloc]init];
myString=[myString stringByAppendingString:@"first value"];
myString=[myString stringByAppendingString:@"second string"];
</code></pre>

blocks|key|293287|text|宏：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|293288|//+stringConcat(...)
//+++++A+shortcut+for+concatenating+strings+(or+objects'+string+representations).
//+++++Input:+Any+number+of+non-nil+NSObjects.
//+++++Output:+All+arguments+concatenated+together+into+a+single+NSString.

#define+stringConcat(...)+\
++++[@[__VA_ARGS__]+componentsJoinedByString:@""]|code-block|syntax|javascript|293289|测试用例：|293290|-+(void)testStringConcat+{
++++NSString+*actual;

++++actual+=+stringConcat();+//might+not+make+sense,+but+it's+still+a+valid+expression.
++++STAssertEqualObjects(@"",+actual,+@"stringConcat");

++++actual+=+stringConcat(@"A");
++++STAssertEqualObjects(@"A",+actual,+@"stringConcat");

++++actual+=+stringConcat(@"A",+@"B");
++++STAssertEqualObjects(@"AB",+actual,+@"stringConcat");

++++actual+=+stringConcat(@"A",+@"B",+@"C");
++++STAssertEqualObjects(@"ABC",+actual,+@"stringConcat");

++++//+works+on+all+NSObjects+(not+just+strings):
++++actual+=+stringConcat(@1,+@"+",+@2,+@"+",+@3);
++++STAssertEqualObjects(@"1+2+3",+actual,+@"stringConcat");
}|293291|293292|备用宏：(如果您希望强制使用最少数量的参数)|293293|//+stringConcat(...)
//+++++A+shortcut+for+concatenating+strings+(or+objects'+string+representations).
//+++++Input:+Two+or+more+non-nil+NSObjects.
//+++++Output:+All+arguments+concatenated+together+into+a+single+NSString.

#define+stringConcat(str1,+str2,+...)+\
++++[@[+str1,+str2,+##__VA_ARGS__]+componentsJoinedByString:@""];|293294|entityMap^0|0|2|0|0|0|5|0|0|0|0|4|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|13|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|R|3|S|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|T|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|U|$]]

Macro:

<pre><code>// stringConcat(...)
// A shortcut for concatenating strings (or objects' string representations).
// Input: Any number of non-nil NSObjects.
// Output: All arguments concatenated together into a single NSString.

#define stringConcat(...) \
 [@[__VA_ARGS__] componentsJoinedByString:@""]
</code></pre>

Test Cases:

<pre><code>- (void)testStringConcat {
 NSString *actual;

 actual = stringConcat(); //might not make sense, but it's still a valid expression.
 STAssertEqualObjects(@"", actual, @"stringConcat");

 actual = stringConcat(@"A");
 STAssertEqualObjects(@"A", actual, @"stringConcat");

 actual = stringConcat(@"A", @"B");
 STAssertEqualObjects(@"AB", actual, @"stringConcat");

 actual = stringConcat(@"A", @"B", @"C");
 STAssertEqualObjects(@"ABC", actual, @"stringConcat");

 // works on all NSObjects (not just strings):
 actual = stringConcat(@1, @" ", @2, @" ", @3);
 STAssertEqualObjects(@"1 2 3", actual, @"stringConcat");
}
</code></pre>

<hr>

Alternate macro: (if you wanted to enforce a minimum number of arguments)

<pre><code>// stringConcat(...)
// A shortcut for concatenating strings (or objects' string representations).
// Input: Two or more non-nil NSObjects.
// Output: All arguments concatenated together into a single NSString.

#define stringConcat(str1, str2, ...) \
 [@[ str1, str2, ##__VA_ARGS__] componentsJoinedByString:@""];
</code></pre>

blocks|key|3510725|text|NSString+*myString+=+@"This";
NSString+*test+=+[myString+stringByAppendingString:@"+is+just+a+test"];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3510726|几年后，现在使用目标C，我认为这是使用目标C来实现您试图实现的目标的最佳方式。|unstyled|3510727|开始在Xcode应用程序中键入"N“，它会自动完成为"NSString”。键入"str“，它会自动完成为"stringByAppendingString”。所以击键是相当有限的。|3510728|一旦你掌握了按"@“键并按the键的诀窍，编写可读代码的过程就不再是问题了。这只是一个适应的问题。|3510729|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>NSString *myString = @"This";
NSString *test = [myString stringByAppendingString:@" is just a test"];
</code></pre>

After a couple of years now with Objective C I think this is the best way to work with Objective C to achieve what you are trying to achieve.

Start keying in "N" in your Xcode application and it autocompletes to "NSString".
key in "str" and it autocompletes to "stringByAppendingString". So the keystrokes are quite limited.

Once you get the hang of hitting the "@" key and tabbing the process of writing readable code no longer becomes a problem. It is just a matter of adapting.

blocks|key|3510754|text|我在lldb窗格中尝试执行以下操作|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3510755|[NSString+stringWithFormat:@"%25@/%25@/%25@",+three,+two,+one];|code-block|syntax|javascript|3510756|哪些错误。|3510757|改为使用alloc和initWithFormat方法：|3510758|[[NSString+alloc]+initWithFormat:@"%25@/%25@/%25@",+@"three",+@"two",+@"one"];|3510759|entityMap^0|2|4|0|0|0|A|E|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|O|3|P|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

Was trying the following in the <code>lldb</code> pane 

<pre><code>[NSString stringWithFormat:@"%@/%@/%@", three, two, one];
</code></pre>

which errors.

instead use alloc and <code>initWithFormat</code> method:

<pre><code>[[NSString alloc] initWithFormat:@"%@/%@/%@", @"three", @"two", @"one"];
</code></pre>

blocks|key|1009602|text|NSNumber+*lat+=+[NSNumber+numberWithDouble:destinationMapView.camera.target.latitude];
NSNumber+*lon+=+[NSNumber+numberWithDouble:destinationMapView.camera.target.longitude];
NSString+*DesconCatenated+=+[NSString+stringWithFormat:@"%25@%7C%25@",lat,lon];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1009603|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>NSNumber *lat = [NSNumber numberWithDouble:destinationMapView.camera.target.latitude];
NSNumber *lon = [NSNumber numberWithDouble:destinationMapView.camera.target.longitude];
NSString *DesconCatenated = [NSString stringWithFormat:@"%@|%@",lat,lon];
</code></pre>

blocks|key|3510806|text|在我测试时，这两种格式都可以在XCode7中使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3510807|NSString+*sTest1+=+{@"This"+"+and+that"+"+and+one+more"};
NSString+*sTest2+=+{
++@"This"
++"+and+that"
++"+and+one+more"
};

NSLog(@"\n%25@\n\n%25@",sTest1,sTest2);|code-block|syntax|javascript|3510808|由于某些原因，您只需要在混合的第一个字符串中使用@+operator字符。|3510809|但是，它不能与变量插入一起工作。为此，您可以使用this+extremely+simple+solution，除了在"cat“而不是"and”上使用宏。|offset|length|3510810|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/11320175/105539^0|0|0|0|O|U|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Either of these formats work in XCode7 when I tested:

<pre><code>NSString *sTest1 = {@"This" " and that" " and one more"};
NSString *sTest2 = {
 @"This"
 " and that"
 " and one more"
};

NSLog(@"\n%@\n\n%@",sTest1,sTest2);
</code></pre>

For some reason, you only need the @ operator character on the first string of the mix.

However, it doesn't work with variable insertion. For that, you can use <a href="https://stackoverflow.com/a/11320175/105539">this extremely simple solution</a> with the exception of using a macro on "cat" instead of "and".

blocks|key|4358550|text|假设你不知道那里有多少个字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4358551|NSMutableArray+*arrForStrings+=+[[NSMutableArray+alloc]+init];
for+(int+i=0;+i<[allMyStrings+count];+i%2B%2B)+{
++++NSString+*str+=+[allMyStrings+objectAtIndex:i];
++++[arrForStrings+addObject:str];
}
NSString+*readyString+=+[[arrForStrings+mutableCopy]+componentsJoinedByString:@",+"];|code-block|syntax|javascript|4358552|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Let's imagine that u don't know how many strings there.

<pre><code>NSMutableArray *arrForStrings = [[NSMutableArray alloc] init];
for (int i=0; i&lt;[allMyStrings count]; i++) {
 NSString *str = [allMyStrings objectAtIndex:i];
 [arrForStrings addObject:str];
}
NSString *readyString = [[arrForStrings mutableCopy] componentsJoinedByString:@", "];
</code></pre>

blocks|key|3510903|text|对于所有需要在UI-Test中使用它的Objective+C爱好者：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3510904|-(void)+clearTextField:(XCUIElement*)+textField{

++++NSString*+currentInput+=+(NSString*)+textField.value;
++++NSMutableString*+deleteString+=+[NSMutableString+new];

++++for(int+i+=+0;+i+<+currentInput.length;+%2B%2Bi)+{
++++++++[deleteString+appendString:+[NSString+stringWithFormat:@"%25c",+8]];
++++}
++++[textField+typeText:deleteString];
}|code-block|syntax|javascript|3510905|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For all Objective C lovers that need this in a UI-Test:

<pre><code>-(void) clearTextField:(XCUIElement*) textField{

 NSString* currentInput = (NSString*) textField.value;
 NSMutableString* deleteString = [NSMutableString new];

 for(int i = 0; i &lt; currentInput.length; ++i) {
 [deleteString appendString: [NSString stringWithFormat:@"%c", 8]];
 }
 [textField typeText:deleteString];
}
</code></pre>

blocks|key|1009673|text|灵感来自克里斯的NSMutableString点子，我做了一个完美的宏IMHO。它支持插入nil元素，没有任何异常。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1009674|#import+<libextobjc/metamacros.h>

#define+STR_CONCAT(...)+\
++++({+\
++++++++__auto_type+str__+=+[NSMutableString+string];+\
++++++++metamacro_foreach_cxt(never_use_immediately_str_concatify_,,+str__,+__VA_ARGS__)+\
++++++++(NSString+*)str__.copy;+\
++++})

#define+never_use_immediately_str_concatify_(INDEX,+CONTEXT,+VAR)+\
++++[CONTEXT+appendString:VAR+?:+@""];|code-block|syntax|javascript|1009675|示例：|1009676|STR_CONCAT(@"button_bg_",+@(count).stringValue,+@".png");+
//+button_bg_2.png|1009677|如果您愿意，您可以通过使用[VAR+description]代替NSString来使用id类型作为参数。|1009678|entityMap^0|8|F|0|0|0|0|D|H|W|8|17|2|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|R|$]]

Inspired by <code>NSMutableString</code> idea from Chris, I make a perfect macro imho.
It supports insert nil elements without any Exceptions.
<pre><code>#import &lt;libextobjc/metamacros.h&gt;

#define STR_CONCAT(...) \
 ({ \
 __auto_type str__ = [NSMutableString string]; \
 metamacro_foreach_cxt(never_use_immediately_str_concatify_,, str__, __VA_ARGS__) \
 (NSString *)str__.copy; \
 })

#define never_use_immediately_str_concatify_(INDEX, CONTEXT, VAR) \
 [CONTEXT appendString:VAR ?: @&quot;&quot;];
</code></pre>
Example:
<pre><code>STR_CONCAT(@&quot;button_bg_&quot;, @(count).stringValue, @&quot;.png&quot;); 
// button_bg_2.png
</code></pre>
If you like, you can use <code>id</code> type as parameter by using <code>[VAR description]</code> instead of <code>NSString</code>.

Are there any shortcuts to (<code>stringByAppendingString:</code>) string concatenation in Objective-C, or shortcuts for working with <code>NSString</code> in general?

For example, I'd like to make:

<pre><code>NSString *myString = @"This";
NSString *test = [myString stringByAppendingString:@" is just a test"];
</code></pre>

something more like:

<pre><code>string myString = "This";
string test = myString + " is just a test";
</code></pre>

Shortcuts in Objective-C to concatenate NSStrings

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Objective-C中有没有连接(stringByAppendingString:)字符串的快捷键，或者一般使用NSString的快捷键？例如，我想这样做：NSString *myString = @"This";NSString *test = [myString stringByAppendingString:...

问Objective-C中连接NSStrings的快捷方式
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