view3.snp_makeConstraints { (make)in//横向坐标等于view1 make.centerX.equalTo(view1)
//纵向坐标等于view1(横和纵都相等就等于对view1居中) make.centerY.equalTo(view1)
//长等于view2的2倍 make.width.equalTo(view2).multipliedBy(2)
//高等于view2的3分之一 make.height.equalTo(view2).dividedBy(3)
}
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