ios – 检查字符串中是否包含表情符号

我得到一个字符串的文本大小

textSize = [[tempDict valueForKeyPath:@"caption.text"] sizeWithFont:[UIFont systemFontOfSize:12] constrainedToSize:CGSizeMake(280,CGFLOAT_MAX) lineBreakMode: NSLineBreakByWordWrapping];

我唯一的问题是,如果字符串只包含一个表情符号,我的应用程序崩溃.有没有一个简单的方法来检查emojis,或者我必须创建一个所有可能的emojis的数组,然后使用它来检查它们？

错误：

-[NSNull sizeWithFont:constrainedToSize:lineBreakMode:]: unrecognized selector sent to instance 0x3aa88a60


if ([tempDict valueForKeyPath:@"caption.text"]){
            NSLog(@"%@",[tempDict valueForKeyPath:@"caption"]);
            //Measure the message label Box height
            textSize = [[tempDict valueForKeyPath:@"caption.text"] sizeWithFont:[UIFont systemFontOfSize:12] constrainedToSize:CGSizeMake(280,CGFLOAT_MAX) lineBreakMode: NSLineBreakByWordWrapping];
            int height = 320 + 20 + textSize.height;
            [cellHeight addobject:[NSNumber numberWithInt:height]];
}

解决方法

尝试这个代码：

- (BOOL)stringContainsEmoji:(Nsstring *)string {
    __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;
}