android显示ios emoji表情符号,UITextView/UITextField检测并过滤Emoji表情符号

为避免当用户通过中文键盘输入中文“哈哈”后出现可选文字中选中的Emoji笑脸，最后在- (void)textFieldDidEndEditing:(UITextField *)textField方法中统一通过检查最终字符串textField/textView.text的内容，通过Emoji筛unicode编码来判断是否存在Emoji表情，如果存在则提醒用户做修改。

//在输入完成时，调用下面那个方法来判断输入的字符串是否含有表情

- (void)textFieldDidEndEditing:(UITextField *)textField

{

if ([self stringContainsEmoji:textField.text]) {

NSLog(@"含有表情");

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"警告！" message:@"输入内容含有表情，请重新输入" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定",nil];

[alertView show];

textField.text = @"";

[textField becomeFirstResponder];

}else {

NSLog(@"不含有表情");

}

}

- (BOOL)stringContainsEmoji:(NSString *)string

{

// 过滤所有表情。returnValue为NO表示不含有表情，YES表示含有表情

__block BOOL returnValue = NO;

[string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {

const unichar hs = [substring characterAtIndex:0];

// surrogate pair

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 <= 0x1f77f) {

returnValue = YES;

}

}

} else if (substring.length > 1) {

const unichar ls = [substring characterAtIndex:1];

if (ls == 0x20e3) {

returnValue = YES;

}

} else {

// non surrogate

if (0x2100 <= hs && hs <= 0x27ff) {

returnValue = YES;

} else if (0x2B05 <= hs && hs <= 0x2b07) {

returnValue = YES;

} else if (0x2934 <= hs && hs <= 0x2935) {

returnValue = YES;

} else if (0x3297 <= hs && hs <= 0x3299) {

returnValue = YES;

} else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {

returnValue = YES;

}

}

}];

return returnValue;

}