_ NSCFString containsString:]: unrecognized selector sent to instance 0x7f876b79e160, nscfstring

_ NSCFString containsString:]: unrecognized selector sent to instance 0x7f876b79e160, nscfstring

If you want your code to work on iOS 7 as well as iOS 8 you shoshould use one of the rangeOfString callinstead. basically if the range returned has a length of zero, the substring is not there.

/* 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 

@implementation NSString (Contains)- (BOOL)myContainsString:(NSString*)other {  NSRange range = [self rangeOfString:other];  return range.length != 0;}@end

Original article link

Http://stackoverflow.com/questions/26410420/nsstring-containsstring-crashes