有效的禁止文本输入框输入表情

#import "ViewController.h"

@implementation ViewController
{
    IBOutlet UITextView *textinput;
}

- ( void )viewDidLoad
{
    [ super viewDidLoad ];
    [textinput setDelegate : self ];
}

- ( void )textViewDidChange:( UITextView *)textView
{
    NSRange textRange = [textView selectedRange ];
    [textView setText :[ self disable_emoji :[textView text ]]];
    [textView setSelectedRange :textRange];
}

- ( NSString *)disable_emoji:( NSString *)text
{
    NSRegularExpression *regex = [ NSRegularExpression regularExpressionWithPattern : @"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]" options : NSRegularExpressionCaseInsensitive error :nil ];
    NSString *modifiedString = [regex stringByReplacingMatchesInString :text
                                                              options : 0
                                                                range :NSMakeRange( 0 , [text length ])
                                                         withTemplate : @"" ];
    return modifiedString;
}
 //文本输入框禁止方法 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string{          if ([[[UITextInputMode currentInputMode] primaryLanguage] isEqualToString:@"emoji"]) {         return NO;     }     return YES;      }
@end