11.UIView的transform属性

transform:形变属性，能完成的功能：平移、缩放、旋转

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

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

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

例一：
CGAffineTransform translation = CGAffineTransformMakeTranslation(-100, 100);//平移
CGAffineTransform scaleTranslation = CGAffineTransformScale(translation, 0.5, 0.5);//缩放
CGAffineTransform rotateScaleTranslation = CGAffineTransformRotate(scaleTranslation, M_PI_2);  //旋转
self.tempView.transform = rotateScaleTranslation;
例二：每次旋转M_PI_4
[UIView animateWithDuration:1.0 animations:^{self.tempView.transform = CGAffineTransformRotate(self.tempView.transform, M_PI_4);
}];

[UIView animateWithDuration:2.0 animations:^{
self.tempView.transform =CGAffineTransformIdentity;}];