[Label显示不同颜色] UILabel show different colors，根据range给的位置，让范围内的Label文字设置颜色 #Label

gistfile1.m

[self returnColorString:@"hello, i am xiao qu" WithRange:@"7 7,9 10,17 18"];//, 9 10

self.dialogLab.attributedText = [self returnColorString:resultDic.refText WithRange:resultDic.scoreInfo];

- (NSMutableAttributedString *)returnColorString:(NSString *)oldString WithRange:(NSString *)range{
    
    NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:oldString];
    NSArray *arr = [range componentsSeparatedByString:@","];
    for (NSString *rang in arr) {
        NSArray *subArr = [rang componentsSeparatedByString:@" "];
        NSInteger start = [subArr.firstObject integerValue];
        NSInteger end = [subArr.lastObject integerValue];
        
        [str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(start, (end - start + 1))];
    }
    return str;
}