button 上图下字

//文字距离上边框的距离增加imageView的高度，
//距离左边框减少imageView的宽度,距离下边框和右边框距离不变
[button setTitleEdgeInsets:UIEdgeInsetsMake(button.imageView.frame.size.height ,- button.imageView.frame.size.width, 0.0,0.0)];
        
//图片距离右边框距离减少图片的宽度，其它不边
[button setImageEdgeInsets:UIEdgeInsetsMake(0.0, 0.0,0.0, -button.titleLabel.bounds.size.width)];