上下:
self.rechargeButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//使图片和文字水平居中显示
[self.rechargeButton setTitleEdgeInsets:UIEdgeInsetsMake(self.rechargeButton.imageView.frame.size.height+10 ,-self.rechargeButton.imageView.frame.size.width, 0.0,0.0)];//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
[self.rechargeButton setImageEdgeInsets:UIEdgeInsetsMake(-10, 0.0,0.0, -self.rechargeButton.titleLabel.bounds.size.width)];//图片距离右边框距离减少图片的宽度，其它不边
左右:
因为默认button 图片在左,文字在右, 下面代码是反过来的: 文字 图片
[self.DetailButton setTitleEdgeInsets:UIEdgeInsetsMake(0, -self.DetailButton.imageView.bounds.size.width, 0, self.DetailButton.imageView.bounds.size.width)];
[self.DetailButton setImageEdgeInsets:UIEdgeInsetsMake(0, self.DetailButton.titleLabel.bounds.size.width, 0, -self.DetailButton.titleLabel.bounds.size.width)];
