属性字符串

属性字符串：改变字符串里的字体颜色，字体大小

- (void)viewDidLoad {
    [super viewDidLoad];

    [self strtest];
}
//属性字符串
- (void)strtest{
    UILabel * labels = [[UILabel alloc] init];
    labels.frame = CGRectMake(50, 100, 300, 30);
    labels.font = [UIFont systemFontOfSize:14];
    NSString *str1 = @"奖励";
    NSString * str2 = @"活动提";
    NSString * str3 =@"每个角色";
    NSString * str4 = [NSString stringWithFormat:@"%@%@%@",str1,str2,str3];
    NSMutableAttributedString *strs = [[NSMutableAttributedString alloc]initWithString:str4];
    [strs addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:89/255.0 green:112/255.0 blue:143/255.0 alpha:1] range:NSMakeRange(0, [str1 length])];
    [strs addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange([str1 length], [str2 length])];
    [strs addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:89/255.0 green:112/255.0 blue:143/255.0 alpha:1] range:NSMakeRange([str1 length]+[str2 length], [str3 length])];
    
    
    [strs addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"HelveticaNeue-Bold" size:8.0] range:NSMakeRange(0, [str1 length])];
        [strs addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"HelveticaNeue-Bold" size:10.0] range:NSMakeRange([str1 length], [str2 length])];
        [strs addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"HelveticaNeue-Bold" size:8.0] range:NSMakeRange([str1 length]+[str2 length], [str3 length])];
    labels.attributedText = strs;
    [self.view addSubview:labels];
    
}