iOS 设置按钮图片和文字垂直居中

// 设置按钮和图片垂直居中
-(void)setButtonContentCenter:(UIButton *) btn

{
    CGSize imgViewSize,titleSize,btnSize;
    UIEdgeInsets imageViewEdge,titleEdge;
    CGFloat heightSpace = 10.0f;
    //设置按钮内边距
    imgViewSize = btn.imageView.bounds.size;
    titleSize = btn.titleLabel.bounds.size;
    btnSize = btn.bounds.size;
    imageViewEdge = UIEdgeInsetsMake(heightSpace,0.0, btnSize.height -imgViewSize.height - heightSpace, - titleSize.width);
    [btn setImageEdgeInsets:imageViewEdge];
    titleEdge = UIEdgeInsetsMake(imgViewSize.height +heightSpace, - imgViewSize.width, 0.0, 0.0);
    [btn setTitleEdgeInsets:titleEdge];
}