CGAffineTransform

self.tempView.transform = CGAffineTransformIdentity;

// CGAffineTransform 方法时在按钮的上次变形的累加

self.tempView.transform = CGAffineTransformScale(self.tempView.transform, 0.8, 0.8);

self.tempView.transform = CGAffineTransformRotate(self.tempView.transform, M_PI_4);

self.tempView.transform = CGAffineTransformTranslate(self.tempView.transform, dx, dy);

// transform:形变属性，能完成的功能：平移、缩放、旋转 CGAffineTransformMake 方法则是相对于初始位置变化

// 缩放

self.tempView.transform = CGAffineTransformMakeScale(0.5, 0.5);

// 平移

self.tempView.transform = CGAffineTransformMakeTranslation(-100, 100);

// 旋转

self.tempView.transform = CGAffineTransformMakeRotation(-M_PI_4);

CGAffineTransform translation = CGAffineTransformMakeTranslation(-100, 100);

CGAffineTransform scaleTranslation = CGAffineTransformScale(translation, 0.5, 0.5);

CGAffineTransform rotateScaleTranslation = CGAffineTransformRotate(scaleTranslation, M_PI_2);

self.tempView.transform = rotateScaleTranslation;