//按鈕實(shí)現(xiàn)文字在下，圖片在上
-(void)initButton:(UIButton*)btn{
btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//使圖片和文字水平居中顯示
// 按鈕圖片和標(biāo)題總高度
CGFloat totalHeight = (btn.imageView.frame.size.height + btn.titleLabel.frame.size.height);
// 設(shè)置按鈕圖片偏移
[btn setImageEdgeInsets:UIEdgeInsetsMake(-(totalHeight - btn.imageView.frame.size.height), 0.0, 0.0, -btn.titleLabel.frame.size.width)];
// 設(shè)置按鈕標(biāo)題偏移
[btn setTitleEdgeInsets:UIEdgeInsetsMake(0.0, -btn.imageView.frame.size.width, -(totalHeight - btn.titleLabel.frame.size.height),0.0)];
}