transform本質(zhì)上是改變了控件的frame

transform基本設(shè)置

 // 縮放
        self.tempView.transform = CGAffineTransformMakeScale(0.5, 0.5);
        // 平移
        self.tempView.transform = CGAffineTransformMakeTranslation(-100, 100);
        //旋轉(zhuǎn)
        self.tempView.transform = CGAffineTransformMakeRotation(-M_PI_4);

transform屬性的疊加

       CGAffineTransform translation = CGAffineTransformMakeTranslation(-100, 100);
        CGAffineTransform scaleTranslation = CGAffineTransformScale(translation, 0.5, 0.5);
        CGAffineTransform rotateScaleTranslation = CGAffineTransformRotate(scaleTranslation, M_PI_2);
        self.tempView.transform = rotateScaleTranslation;

清空transform，以前的平移、縮放、旋轉(zhuǎn)都會(huì)消失

self.tempView.transform = CGAffineTransformIdentity;