UITextView或UITextField输入字数限制

UITextField中限制字数，限制字符为18位

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { if ([textField.text length] + [string length] - range.length > 18){ return NO; } return YES; } UITextview中限制字符个数，字符个数为18位

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{ if ([textView.text length] + [text length] - range.length > 18){ return NO; } return YES; }