- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text { NSInteger maxLength = 200; If ([text isEqualToString:@"\n"]){return [self.textView resignFirstResponder]; return false; } if ([self stringContainsEmoji:text]) { return false; } if (textView.text.length + text.length > maxLength) { //NSString *allText = [textView.text stringByReplacingCharactersInRange:range withString:text]; NSString *allText = [NSString stringWithFormat:@"%@%@",textView.text,text]; textView.text = [allText substringToIndex:maxLength]; return false; } return true; } - (BOOL)stringContainsEmoji:(NSString *)string {// filter all emoticons __block BOOL containsEmoji = NO; / / scratchable latex access to the Chinese characters is a circle 123 can enter the if ([string isEqualToString: @ "➋]" | | [string isEqualToString: @ "➌]" | | [string IsEqualToString: @ "➍]" | | [string isEqualToString: @ "➎]" | | [string isEqualToString: @ "➏]" | | [string IsEqualToString: @ "➐]" | | [string isEqualToString: @ "➑]" | | [string isEqualToString: @ "➒"]) {return containsEmoji; } [string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) { const unichar hs = [substring characterAtIndex:0]; if (0xd800 <= hs && hs <= 0xdbff) { if (substring.length > 1) { const unichar ls = [substring characterAtIndex:1]; const int uc = ((hs - 0xd800) * 0x400) + (ls  - 0xdc00) + 0x10000; if (0x1d000 <= uc && uc <= 0x1F9FF) {// <=0x1f77f <=0x1f9c0 <=0x1F9FF containsEmoji = YES; } } } else if (substring.length > 1) { const unichar ls = [substring characterAtIndex:1]; if (ls == 0x20e3 || ls == 0xfe0f || ls == 0xd83c) { containsEmoji = YES; } } else { if (0x2100 <= hs && hs <= 0x27ff) { containsEmoji = YES; } else if (0x2B05 <= hs && hs <= 0x2b07) { containsEmoji = YES; } else if (0x2934 <= hs && hs <= 0x2935) { containsEmoji = YES; } else if (0x3297 <= hs && hs <= 0x3299) { containsEmoji = YES; } else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) { containsEmoji = YES; } } if (containsEmoji)  { *stop = YES; } }]; return containsEmoji; }Copy the code