NSString containsString崩溃
NSString containsString崩溃
提问于 2014-10-17 01:28:32
我正在尝试根据数组的一个字符串字段来过滤数组。
nameLower和filterLower都有NSString的值，但是我一直得到：
__NSCFString containsString:]: unrecognized selector sent to instance 0x7f876b79e160
-(void) filterFriendsArray:(NSString*)filter {
[_filteredFriendsArray removeAllObjects];
for (FacebookUser* user in _friendsArray)
{
NSString* nameLower = [user.user.name lowercaseString];
NSString* filterLower = [filter lowercaseString];
if ([nameLower containsString:filterLower])
[_filteredFriendsArray addObject:user];
}
_displayedFriendsArray = _filteredFriendsArray;
}回答 4
Stack Overflow用户
回答已采纳
发布于 2014-10-17 08:43:15
如果你想让你的代码在iOS 7和iOS 8上运行，你应该使用其中的一个rangeOfString调用。基本上，如果返回的范围长度为零，则不存在子字符串。
/* These methods return length==0 if the target string is not found. So, to check for containment: ([str rangeOfString:@"target"].length > 0). Note that the length of the range returned by these methods might be different than the length of the target string, due composed characters and such.
*/
- (NSRange)rangeOfString:(NSString *)aString;
- (NSRange)rangeOfString:(NSString *)aString options:(NSStringCompareOptions)mask;
- (NSRange)rangeOfString:(NSString *)aString options:(NSStringCompareOptions)mask range:(NSRange)searchRange;
- (NSRange)rangeOfString:(NSString *)aString options:(NSStringCompareOptions)mask range:(NSRange)searchRange locale:(NSLocale *)locale NS_AVAILABLE(10_5, 2_0);显然，使用rangeOfString自己在一个类别中实现containsString是微不足道的：
@implementation NSString (Contains)
- (BOOL)myContainsString:(NSString*)other {
NSRange range = [self rangeOfString:other];
return range.length != 0;
}
@endStack Overflow用户
发布于 2015-05-15 19:06:55
比较rangeOfString和NSNotFound
NSRange range = [self rangeOfString:other];
if(range.location != NSNotFound){
//do something
}Stack Overflow用户
发布于 2016-08-05 17:39:47
我将我的解决方案封装在YJKit中，您可以调用-NSString containsString:即使是iOS 8以下的旧版本。
bool _yj_streq(const char *str1, const char *str2, size_t length) {
for (int i = 0; i < length; i++) {
if (*str1++ != *str2++) {
return false;
}
}
return true;
}
- (BOOL)yj_containsString:(NSString *)string {
NSAssert(string != nil, @"*** -[%@ containsString:] can not use nil argument.", [self class]);
size_t len1 = (size_t)self.length;
size_t len2 = (size_t)string.length;
if (len1 == 0 || len2 == 0 || len1 < len2) {
return NO;
}
const char *str1 = self.UTF8String;
const char *str2 = string.UTF8String;
for (size_t i = 0; i <= len1 - len2; i++) {
const char *substr1 = str1 + i;
if (_yj_streq(substr1, str2, len2)) {
return YES;
} else {
continue;
}
}
return NO;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/26410420
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