//根据效果图1我们先来获得imageView的center
CGPoint imageViewCenterNow = button.imageView.center;
//根据效果图1我们先来获得titleLabel的center
CGPoint titleLabelCenterNow = button.titleLabel.center;
//获得Button的Center
CGPoint buttonBoundsCenter = CGPointMake(CGRectGetMidX(button.bounds), CGRectGetMidY(button.bounds));
//根据效果图2我们先来获得imageView最终想要得到的center
CGPoint imageViewCenter = CGPointMake(buttonBoundsCenter.x, CGRectGetMidY(button.imageView.bounds));
//根据效果图2我们再来获得titleLabel最终想要得到的center
CGPoint titleLabelCenter = CGPointMake(buttonBoundsCenter.x, CGRectGetHeight(button.bounds) - CGRectGetMidY(button.titleLabel.bounds));
//根据两个图的差异我们来设置imageEdgeInsets
//因为我们要将图上移，所以top一定是负值，bottom一定是正值，因为我们要将图右移，所以left一定是正值，right一定是负值
CGFloat imageEdgeInsetsTop = imageViewCenter.y - imageViewCenterNow.y;
CGFloat imageEdgeInsetsLeft = imageViewCenter.x - imageViewCenterNow.x;
CGFloat imageEdgeInsetsBottom = -imageEdgeInsetsTop;
CGFloat imageEdgeInsetsRight = - imageEdgeInsetsLeft;
UIEdgeInsets imageInsets = UIEdgeInsetsMake(imageEdgeInsetsTop, imageEdgeInsetsLeft, imageEdgeInsetsBottom, imageEdgeInsetsRight);
button.imageEdgeInsets = imageInsets;
//根据两个图的差异我们来设置titleEdgeInsets，跟image同理
CGFloat titleEdgeInsetsTop = titleLabelCenter.y - titleLabelCenterNow.y;
CGFloat titleEdgeInsetsLeft = titleLabelCenter.x - titleLabelCenterNow.x;
CGFloat titleEdgeInsetsBottom = -titleEdgeInsetsTop;
CGFloat titleEdgeInsetsRight = -titleEdgeInsetsLeft;
UIEdgeInsets titleInsets = UIEdgeInsetsMake(titleEdgeInsetsTop, titleEdgeInsetsLeft, titleEdgeInsetsBottom, titleEdgeInsetsRight);
button.titleEdgeInsets = titleInsets;
