swift中transform的使用

1.基于控件的形变

   默认就是带make的(每次形变都是针对原点)

         imageV.transform = CGAffineTransform(translationX: 20, y: 20)

         imageV.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)

         imageV.transform =  CGAffineTransform(rotationAngle: 180)

   不带make的(在已经形变的基础上做形变)  

          imageV.transform = imageV.transform.scaledBy(x: 0.5, y: 0.5)

          imageV.transform = imageV.transform.rotated(by: 180)

          imageV.transform = imageV.transform.translatedBy(x: 10, y: 10)

#这里与OC的区别比较大...

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2.基于layer的形变

   作用在layer上的  不带make在效果之后的基础上做

         imageV.layer.transform = CATransform3DRotate(imageV.layer.transform, CGFloat(M_PI), 1, 0, 0)

        imageV.layer.transform = CATransform3DIdentity      空的transform

        imageV.layer.transform = CATransform3DScale(imageV.layer.transform, 0.2, 0.2, 0.2)

 作用在layer上的  带make在原点基础上形变

        imageV.layer.transform = CATransform3DMakeScale(0.5, 0.5, 0.5)

        imageV.layer.transform = CATransform3DMakeRotation(180, 1, 0, 0)

        imageV.layer.transform = CATransform3DMakeTranslation(10, 10, 0)