中级篇第一期：UIButton内部再利用

//根据效果图1我们先来获得p_w_picpathView的center
CGPoint p_w_picpathViewCenterNow = button.p_w_picpathView.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p_w_picpathView最终想要得到的center
CGPoint p_w_picpathViewCenter = CGPointMake(buttonBoundsCenter.x, CGRectGetMidY(button.p_w_picpathView.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p_w_picpathEdgeInsets
//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 p_w_picpathEdgeInsetsTop = p_w_picpathViewCenter.y - p_w_picpathViewCenterNow.y;

CGFloat p_w_picpathEdgeInsetsLeft = p_w_picpathViewCenter.x - p_w_picpathViewCenterNow.x;

CGFloat p_w_picpathEdgeInsetsBottom = -p_w_picpathEdgeInsetsTop;

CGFloat p_w_picpathEdgeInsetsRight = - p_w_picpathEdgeInsetsLeft;

UIEdgeInsets p_w_picpathInsets = UIEdgeInsetsMake(p_w_picpathEdgeInsetsTop, p_w_picpathEdgeInsetsLeft, p_w_picpathEdgeInsetsBottom, p_w_picpathEdgeInsetsRight);

button.p_w_picpathEdgeInsets = p_w_picpathInsets;

//根据两个图的差异我们来设置titleEdgeInsets，跟p_w_picpath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;