以编程方式处理旋转和调整视图（Xcode）

Question

Here is the problem I've been struggling with:

I'm creating a view programatically using loadView. Once it's loaded it looks just great in Portrait view. However, I want to handle rotation of the device. Therefore I use willAnimateRotationToInterfaceOrientation method.

Within this method I call a function that adjust all the elements. What that function does is just goes through all my views and sets new CGRect to each of them. It works just fine on portrait orientations (up and upside-down), but once I change orientation to horizontal, it crops.

Two questions:

1. What is the most likely reason for such behavior?
2. How would you suggest handling device rotation without creating a separate view for horisontal / vertical orientations?

Answer 1

I think you are missing the key part. When you are setting the frame at portrait view at view did load, view got the frame but when it change to the landscape it change but again from there i think you are not setting the frame for portrait view. use notification

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:@"UIDeviceOrientationDidChangeNotification" object:nil];


-(void) orientationChanged:(NSNotification *)notification
{
    [[NSOperationQueue mainQueue] addOperationWithBlock:^{

        UIDeviceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];

        if((orientation == UIDeviceOrientationPortrait) || (orientation == UIDeviceOrientationPortraitUpsideDown)) {
           // set frame here
        }else if ((orientation == UIDeviceOrientationLandscapeLeft) || (orientation == UIDeviceOrientationLandscapeRight)){
          // set frame here too
        }
    }];
}