实现按钮上面标题的换行、颜色区别、字体大小区别

//普通状态

NSString *first = btnTitle;
NSString *second = [NSString stringWithFormat:@"赠送：%@元", detailTitle];
NSString *btnString = [NSString stringWithFormat:@"%@\n%@", first, second];
NSMutableAttributedString *btnAttriTitle = [[NSMutableAttributedString alloc] initWithString:btnString];
NSDictionary *dictNor = @{
        NSForegroundColorAttributeName : BZChongZhiZengSongColor,
        NSFontAttributeName : font1
};

NSRange rangeNor = NSMakeRange(first.length+1, second.length);
[btnAttriTitle  addAttributes:dictNor range:rangeNor];
button.titleLabel.numberOfLines = 0;
button.titleLabel.textAlignment = NSTextAlignmentCenter;
[button setAttributedTitle:btnAttriTitle forState:UIControlStateNormal];

//高亮、选中状态

NSString *btnString2 = [NSString stringWithFormat:@"%@\n%@", first, second];
NSMutableAttributedString *btnAttriTitle2 = [[NSMutableAttributedString alloc] initWithString:btnString2];
NSDictionary *dictSel1 = @{
        NSForegroundColorAttributeName : BZredColor,
        NSFontAttributeName : font2
};

NSDictionary *dictSel2 = @{
        NSForegroundColorAttributeName : BZredColor,
        NSFontAttributeName : font1
};
NSRange rangeSel1 = NSMakeRange(0, first.length);
NSRange rangeSel2 = NSMakeRange(first.length + 1, second.length);
[btnAttriTitle2 addAttributes:dictSel1 range:rangeSel1];
[btnAttriTitle2 addAttributes:dictSel2 range:rangeSel2];
[button setAttributedTitle:btnAttriTitle2 forState:UIControlStateHighlighted];
[button setAttributedTitle:btnAttriTitle2 forState:UIControlStateSelected];

效果图

-----常见问题---

button设置选中状态后，再点击没有高亮状态（起初设置高亮、选中状态一样）。

解决办法：

设置UIControlStateHighlighted | UIControlStateSelected状态

[button setAttributedTitle:btnAttriTitle2 forState:UIControlStateHighlighted | UIControlStateSelected];