禁止表情输入

// textView内容改变
- (void)textViewDidChange:(UITextView *)textView
{
if (textView.text.length > 0) {
// 禁止系统表情的输入
NSString *text = [self disable_emoji:[textView text]];
if (![text isEqualToString:textView.text]) {
NSRange textRange = [textView selectedRange];
textView.text = text;
[textView setSelectedRange:textRange];
}
}
}

/**
*  禁止系统表情的输入
*/
- (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;
}