http://www.jianshu.com/p/a5b6d5efce88
http://www.cnblogs.com/On1Key/p/5756343.html
make.edges.equalTo(self.view).inset(UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20))//將redView的邊界約束爲self.vie
