Using CGAfflineTransformMakeScale/Rotation only does one action - ios

Question

I am trying to make a video rotate and scale larger when the user rotates the screen to landscape.
- (void) orientationChanged:(NSNotification *)note
{
bool switchedLeft;
UIDevice * device = note.object;
switch(device.orientation)
{
case UIDeviceOrientationPortrait:
self.videoView.transform=CGAffineTransformMakeScale(0.5,0.5);
if (switchedLeft) {
self.videoView.transform=CGAffineTransformMakeRotation(-M_PI_2);
}else{
self.videoView.transform=CGAffineTransformMakeRotation(M_PI_2);
}
break;
case UIDeviceOrientationLandscapeLeft:
self.videoView.transform=CGAffineTransformMakeRotation(M_PI_2);
self.videoView.transform=CGAffineTransformMakeScale(2.0, 2.0);
switchedLeft=true;
break;
case UIDeviceOrientationLandscapeRight:
self.videoView.transform=CGAffineTransformMakeRotation(-M_PI_2);
self.videoView.transform=CGAffineTransformMakeScale(2.0, 2.0);
switchedLeft=false;
break;
default:
break;
};
}
There are a number of problems. First when I initially rotate to landscape it only does one transformation, in this configuration it just scales it.
The second problem is when I rotate to portrait it calls for the rotation but it never rotates. However i can go back and forth between landscape left and landscape right and it rotates properly. Any help would be greatly appreciated

Answer 1

You are essentially replacing the rotation transform with scale transform. In order to apply both, you need to use CGAffineTransformConcat().
CGAffineTransform rotate = CGAffineTransformMakeRotation(M_PI_2);
CGAffineTransform scale = CGAffineTransformMakeScale(2.0, 2.0);
self.videoView.transform = CGAffineTransformConcat(rotate, scale);
As for the second part, you don't need to apply another rotation, instead set it to default using CGAffineTransformIdentity.
case UIDeviceOrientationPortrait:
CGAffineTransform scale = CGAffineTransformMakeScale(0.5,0.5);
self.videoView.transform = CGAffineTransformConcat(CGAffineTransformIdentity, scale);
break;

Answer 2

try this
CGAffineTransform transform = CGAffineTransformRotate(self. videoView.transform, M_PI);
self. videoView.transform = transform;