//view原始的transform
CGAffineTransform transform = view.transform;
//缩放
//在原来的基础上缩放0.5倍
view.transform = CGAffineTransformScale(transform, 0.5, 0.5);
//旋转
view.transform = CGAffineTransformRotate(view.transform, M_PI/4);
//平移
view.transform = CGAffineTransformTranslate(view.transform, -50, -50);
//还原为初始的transform
view.transform = CGAffineTransformIdentity;
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