NSMutableAttributedString

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//button设置下划线

NSMutableAttributedString *str =[[NSMutableAttributedString alloc] initWithString:@"月利宝产品详情"];

[str addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:(NSRange){0,[str length]}]; //下划线样式

[str addAttribute:NSUnderlineColorAttributeName value:[UIColor redColor] range:(NSRange){0,[str length]}]; //下划线颜色

[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:(NSRange){0,[str length]}]; //字体颜色

[self.detailBtn setAttributedTitle:str forState:(UIControlStateNormal)];

// 效果

// 一段文字显示不同的颜色和字体

UILabel *testLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, 320, 30)];   testLabel.backgroundColor = [UIColor lightGrayColor];   testLabel.textAlignment = NSTextAlignmentCenter;   NSMutableAttributedString *AttributedStr = [[NSMutableAttributedString alloc]initWithString:@"今天天气不错呀"];   [AttributedStr addAttribute:NSFontAttributeName                         value:[UIFont systemFontOfSize:16.0]                         range:NSMakeRange(2, 2)];   [AttributedStr addAttribute:NSForegroundColorAttributeName                         value:[UIColor redColor]                         range:NSMakeRange(2, 2)];   testLabel.attributedText = AttributedStr;   [self.view addSubview:testLabel];

// 效果

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