UIButton

//设置按钮上的字体大小

btn.titleLabel.font = [UIFont systemFontOfSize: 14.0];

[btn setTitle:@“test”  forState:UIControlStateNormal];

// 设置文字位置

btn.contentHorizontalAlignment = UIControlContentHorizonAlignmentLeft;

btn.contentEdgeInsets = UIEdgeInsetsMake(0,10, 0, 0); (如果文字紧贴到边框进行设置, 使文字距离做边框保持10个像素的距离)

// 设置UIButton上字体的颜色

[btn.titleLabel setTextColor:[UIColorblackColor]];

[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; (这样才对)

//button设置下划线 (用NSMutableAttributedString设置)

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)];