如下：是冲突的autolayout  加上key后输出信息为:        

make.right.and.bottom.equalTo(-20);
        make.right.and.bottom.equalTo(-30).key(@"TestForKey");
        
        "<MASLayoutConstraint:0x126695170 UIView:0x126696bf0.right == UIView:0x12654ca70.right - 20>",
        "<MASLayoutConstraint:TestForKey[0] UIView:0x126696bf0.right == UIView:0x12654ca70.right - 30>"

将类的地址换成了 加的key 这样的输出在调试时能很容易发现错误标记。