blocks|key|897844|text|请参阅我上面的评论，我相信当有多个参数时，您必须使用NSInvocation|type|unstyled|depth|inlineStyleRanges|entityRanges|data|897845|有关NSInvocation的更多信息，请单击此处|897846|http://cocoawithlove.com/2008/03/construct-nsinvocation-for-any-message.html|offset|length|897847|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|24|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

See my comment above, and I believe you have to use NSInvocation when there is more than one parameter

more information on NSInvocation here

<a href="http://cocoawithlove.com/2008/03/construct-nsinvocation-for-any-message.html" rel="nofollow">http://cocoawithlove.com/2008/03/construct-nsinvocation-for-any-message.html</a>

blocks|key|897891|text|Target-Action允许三种不同形式的操作选择器：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|897892|-+(void)action
-+(void)action:(id)sender
-+(void)action:(id)sender+forEvent:(UIEvent+*)event|code-block|syntax|javascript|897893|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|$]]

Target-Action allows three different forms of action selector:

<pre><code>- (void)action
- (void)action:(id)sender
- (void)action:(id)sender forEvent:(UIEvent *)event
</code></pre>

blocks|key|897939|text|这解决了我的问题，但它崩溃了，除非我改变|type|unstyled|depth|inlineStyleRanges|entityRanges|data|897940|action:@selector(switchToNewsDetails:event:)+++++++++++++++++|code-block|syntax|javascript|897941|至|897942|action:@selector(switchToNewsDetails:+forEvent:)++++++++++++++|897943|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|$]]

This fixed my problem but it crashed unless I changed 

<pre><code>action:@selector(switchToNewsDetails:event:) 
</code></pre>

to

<pre><code>action:@selector(switchToNewsDetails: forEvent:) 
</code></pre>

blocks|key|1112799|text|我做了一个部分基于上述信息的解决方案。我只需将titlelabel.text设置为要传递的字符串，并将titlelabel.hidden设置为|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1112800|如下所示：|1112801|UIButton+*imageclick+=+[[UIButton+buttonWithType:UIButtonTypeCustom]+retain];
imageclick.frame+=+photoframe;
imageclick.titleLabel.text+=+[NSString+stringWithFormat:@"%25@.%25@",+ti.mediaImage,+ti.mediaExtension];
imageclick.titleLabel.hidden+=+YES;|code-block|syntax|javascript|1112802|这样，就不需要继承或类别，也不会出现内存泄漏|1112803|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I made a solution based in part by the information above. I just set the titlelabel.text to the string I want to pass, and set the titlelabel.hidden = YES

Like this :

<pre><code>UIButton *imageclick = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
imageclick.frame = photoframe;
imageclick.titleLabel.text = [NSString stringWithFormat:@"%@.%@", ti.mediaImage, ti.mediaExtension];
imageclick.titleLabel.hidden = YES;
</code></pre>

This way, there is no need for a inheritance or category and there is no memory leak

blocks|key|898023|text|我为数组中的每个电话号码创建了几个按钮，因此每个按钮需要一个不同的电话号码才能呼叫。在for循环中创建多个按钮时，我使用了setTag函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|898024|for+(NSInteger+i+=+0;+i+<+_phoneNumbers.count;+i%2B%2B)+{

++++UIButton+*phoneButton+=+[[UIButton+alloc]+initWithFrame:someFrame];
++++[phoneButton+setTitle:_phoneNumbers[i]+forState:UIControlStateNormal];

++++[phoneButton+setTag:i];

++++[phoneButton+addTarget:self
++++++++++++++++++++action:@selector(call:)
++++++++++forControlEvents:UIControlEventTouchUpInside];
}|code-block|syntax|javascript|898025|然后在我的call:方法中，我使用了相同的for循环和if语句来选择正确的电话号码：|898026|-+(void)call:(UIButton+*)sender
{
++++for+(NSInteger+i+=+0;+i+<+_phoneNumbers.count;+i%2B%2B)+{
++++++++if+(sender.tag+==+i)+{
++++++++++++NSString+*callString+=+[NSString+stringWithFormat:@"telprompt://%25@",+_phoneNumbers[i]];
++++++++++++[[UIApplication+sharedApplication]+openURL:[NSURL+URLWithString:callString]];
++++++++}
++++}
}|898027|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 was creating several buttons for each phone number in an array so each button needed a different phone number to call. I used the setTag function as I was creating several buttons within a for loop:

<pre><code>for (NSInteger i = 0; i &lt; _phoneNumbers.count; i++) {

 UIButton *phoneButton = [[UIButton alloc] initWithFrame:someFrame];
 [phoneButton setTitle:_phoneNumbers[i] forState:UIControlStateNormal];

 [phoneButton setTag:i];

 [phoneButton addTarget:self
 action:@selector(call:)
 forControlEvents:UIControlEventTouchUpInside];
}
</code></pre>

Then in my call: method I used the same for loop and an if statement to pick the correct phone number:

<pre><code>- (void)call:(UIButton *)sender
{
 for (NSInteger i = 0; i &lt; _phoneNumbers.count; i++) {
 if (sender.tag == i) {
 NSString *callString = [NSString stringWithFormat:@"telprompt://%@", _phoneNumbers[i]];
 [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callString]];
 }
 }
}
</code></pre>

blocks|key|898083|text|我在CustomButton中创建了UIButton的子类，并添加了一个用于存储数据的属性。所以我调用了method：(CustomButton*)+sender.myproperty，在这个方法中我只读取了我的数据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|898084|示例CustomButton：|898085|@interface+CustomButton+:+UIButton
@property(nonatomic,+retain)+NSString+*textShare;
@end|code-block|syntax|javascript|898086|方法操作：|898087|%2B+(void)+share:+(CustomButton*)+sender
{
++++NSString+*text+=+sender.textShare;
++++//your+work…
}|898088|分配操作|898089|++++CustomButton+*btn+=+[[CustomButton+alloc]+initWithFrame:+CGRectMake(margin,+margin,+60,+60)];
++++//+other+setup…

++++btnWa.textShare+=+@"my+text";
++++[btn+addTarget:+self+action:+@selector(shareWhatsapp:)++forControlEvents:+UIControlEventTouchUpInside];|898090|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I subclassed UIButton in CustomButton and I add a property where I store my data. So I call method: (CustomButton*) sender and in the method I only read my data sender.myproperty.

Example CustomButton:

<pre><code>@interface CustomButton : UIButton
@property(nonatomic, retain) NSString *textShare;
@end
</code></pre>

Method action:

<pre><code>+ (void) share: (CustomButton*) sender
{
 NSString *text = sender.textShare;
 //your work…
}
</code></pre>

Assign action

<pre><code> CustomButton *btn = [[CustomButton alloc] initWithFrame: CGRectMake(margin, margin, 60, 60)];
 // other setup…

 btnWa.textShare = @"my text";
 [btn addTarget: self action: @selector(shareWhatsapp:) forControlEvents: UIControlEventTouchUpInside];
</code></pre>

blocks|key|898178|text|需要的不仅仅是通过.tag的(int)？使用KVC！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|898179|您可以通过按钮对象本身传递任何您想要的数据(通过访问CALayers+keyValue+dict)。|898180|898181|像这样设置目标(用":")|898182|[myButton+addTarget:self+action:@selector(buttonTap:)+forControlEvents:UIControlEventTouchUpInside];|code-block|syntax|javascript|898183|898184|将数据添加到按钮本身(也就是按钮的.layer+)，如下所示：|offset|length|style|CODE|898185|NSString+*dataIWantToPass+=+@"this+is+my+data";//can+be+anything,+doesn't+have+to+be+NSString
[myButton.layer+setValue:dataIWantToPass+forKey:@"anyKey"];//you+can+set+as+many+of+these+as+you'd+like+too!|898186|898187|然后当点击按钮时，你可以像这样检查它：|898188|-(void)buttonTap:(UIButton*)sender{

++++NSString+*dataThatWasPassed+=+(NSString+*)[sender.layer+valueForKey:@"anyKey"];
++++NSLog(@"My+passed-thru+data+was:+%25@",+dataThatWasPassed);

}|898189|entityMap^0|0|0|0|0|0|0|H|6|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|14|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|15|8|@]|9|@]|A|$J|K]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|17|8|@$O|18|P|19|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|I|7|1A|8|@]|9|@]|A|$J|K]]|$1|U|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1C|8|@]|9|@]|A|$]]|$1|X|3|Y|5|I|7|1D|8|@]|9|@]|A|$J|K]]|$1|Z|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|10|$]]

<h1>Need more than just an (int) via .tag? Use KVC!</h1>
You can pass any data you want through the button object itself (by accessing CALayers keyValue dict).
<hr />
Set your target like this (with the &quot;:&quot;)
<pre><code>[myButton addTarget:self action:@selector(buttonTap:) forControlEvents:UIControlEventTouchUpInside];
</code></pre>
<hr />
Add your data(s) to the button itself (well the <code>.layer</code> of the button that is) like this:
<pre><code>NSString *dataIWantToPass = @&quot;this is my data&quot;;//can be anything, doesn't have to be NSString
[myButton.layer setValue:dataIWantToPass forKey:@&quot;anyKey&quot;];//you can set as many of these as you'd like too!
</code></pre>
<hr />
Then when the button is tapped you can check it like this:
<pre><code>-(void)buttonTap:(UIButton*)sender{

 NSString *dataThatWasPassed = (NSString *)[sender.layer valueForKey:@&quot;anyKey&quot;];
 NSLog(@&quot;My passed-thru data was: %@&quot;, dataThatWasPassed);

}
</code></pre>

blocks|key|1113039|text|您可以使用闭包(Objective-C中的块)替换target-action，方法是添加一个辅助闭包包装器(ClosureSleeve)，并将其作为关联对象添加到控件中，以便保留它。这样你就可以传递任何参数了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1113040|Swift+3|1113041|class+ClosureSleeve+{
++++let+closure:+()+->+()

++++init(attachTo:+AnyObject,+closure:+@escaping+()+->+())+{
++++++++self.closure+=+closure
++++++++objc_setAssociatedObject(attachTo,+"[\(arc4random())]",+self,+.OBJC_ASSOCIATION_RETAIN)
++++}

++++@objc+func+invoke()+{
++++++++closure()
++++}
}

extension+UIControl+{
++++func+addAction(for+controlEvents:+UIControlEvents,+action:+@escaping+()+->+())+{
++++++++let+sleeve+=+ClosureSleeve(attachTo:+self,+closure:+action)
++++++++addTarget(sleeve,+action:+#selector(ClosureSleeve.invoke),+for:+controlEvents)
++++}
}|code-block|syntax|javascript|1113042|用法：|1113043|button.addAction(for:+.touchUpInside)+{
++++self.switchToNewsDetails(parameter:+i)
}|1113044|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can replace target-action with a closure (block in Objective-C) by adding a helper closure wrapper (ClosureSleeve) and adding it as an associated object to the control so it gets retained. That way you can pass any parameters.

<h1>Swift 3</h1>

<pre><code>class ClosureSleeve {
 let closure: () -&gt; ()

 init(attachTo: AnyObject, closure: @escaping () -&gt; ()) {
 self.closure = closure
 objc_setAssociatedObject(attachTo, "[\(arc4random())]", self, .OBJC_ASSOCIATION_RETAIN)
 }

 @objc func invoke() {
 closure()
 }
}

extension UIControl {
 func addAction(for controlEvents: UIControlEvents, action: @escaping () -&gt; ()) {
 let sleeve = ClosureSleeve(attachTo: self, closure: action)
 addTarget(sleeve, action: #selector(ClosureSleeve.invoke), for: controlEvents)
 }
}
</code></pre>

Usage:

<pre><code>button.addAction(for: .touchUpInside) {
 self.switchToNewsDetails(parameter: i)
}
</code></pre>

blocks|key|1113086|text|还有另一种方法，您可以获取按钮被按下的单元格的indexPath：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1113087|使用常用的操作选择器，如：|1113088|+UIButton+*btn+=+....;
++++[btn+addTarget:self+action:@selector(yourFunction:)+forControlEvents:UIControlEventTouchUpInside];|code-block|syntax|javascript|1113089|然后在yourFunction中：|1113090|+++-+(void)+yourFunction:(id)sender+{

++++UIButton+*button+=+sender;
++++CGPoint+center+=+button.center;
++++CGPoint+rootViewPoint+=+[button.superview+convertPoint:center+toView:self.tableView];
++++NSIndexPath+*indexPath+=+[self.tableView+indexPathForRowAtPoint:rootViewPoint];
++++//the+rest+of+your+code+goes+here
++++..
}|1113091|因为你得到了一个indexPath，所以它变得简单得多。|1113092|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

There is another one way, in which you can get indexPath of the cell where your button was pressed:

using usual action selector like:

<pre><code> UIButton *btn = ....;
 [btn addTarget:self action:@selector(yourFunction:) forControlEvents:UIControlEventTouchUpInside];
</code></pre>

and then in in yourFunction:

<pre><code> - (void) yourFunction:(id)sender {

 UIButton *button = sender;
 CGPoint center = button.center;
 CGPoint rootViewPoint = [button.superview convertPoint:center toView:self.tableView];
 NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:rootViewPoint];
 //the rest of your code goes here
 ..
}
</code></pre>

since you get an indexPath it becames much simplier.

blocks|key|898350|text|如果您只想更改导航控制器与新视图一起显示的leftBarButtonItem的文本，则可以在调用pushViewController之前将当前视图的标题更改为所需的文本，并在viewHasDisappered回调中将其恢复以供将来显示当前视图时使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|898351|这种方法保持了所示箭头的功能(popViewController)和外观不变。|898352|它至少适用于使用Xcode10.1构建的iOS+12……|898353|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

If you just want to change the text for the leftBarButtonItem shown by the navigation controller together with the new view, you may change the title of the current view just before calling pushViewController to the wanted text and restore it in the viewHasDisappered callback for future showings of the current view.

This approach keeps the functionality (popViewController) and the appearance of the shown arrow intact.

It works for us at least with iOS 12, built with Xcode 10.1 ...

I am using addTarget:action:forControlEvents like this:

<pre><code>[newsButton addTarget:self
action:@selector(switchToNewsDetails)
forControlEvents:UIControlEventTouchUpInside];
</pre></code>

and I would like to pass parameters to my selector "switchToNewsDetails".
The only thing I succeed in doing is to pass the (id)sender by writing:
<pre><code>action:@selector(switchToNewsDetails:)</pre></code>

But I am trying to pass variables like integer values. Writing it this way doesn't work :

<pre><code>int i = 0;
[newsButton addTarget:self
action:@selector(switchToNewsDetails:i)
forControlEvents:UIControlEventTouchUpInside];
</pre></code>

Writing it this way does not work either:

<pre><code>int i = 0;
[newsButton addTarget:self
action:@selector(switchToNewsDetails:i:)
forControlEvents:UIControlEventTouchUpInside];
</pre></code>

Any help would be appreciated :)

Passing parameters to addTarget:action:forControlEvents

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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我像这样使用addTarget:action:forControlEvents：​[newsButton addTarget:selfaction:@selector(switchToNewsDetails)forControlEvents:UIControlEventTouchUpInside];​我想把参数传递给我...

问将参数传递给addTarget:action:forControlEvents
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