检测lanscap模式并显示UIImage

Question

I am developing an iOS application with uses only portrait mode. i would like to show in all the views of my application an image (320*480) when the user turn the iPhone ( lanscape mode)

How i can do this ?

Answer 1

You can accomplish this in the UIViewController method didRotateFromInterfaceOrientation: , which will be called immediately after the user rotates the device.

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    if (self.interfaceOrientation != UIInterfaceOrientationPortrait) {
        // add image to self.view
    } else {
        // remove image from self.view
    }
}

You could implement this method in each of your app's view controllers. Alternatively, you could implement this in a custom subclass of UIViewController and then have all of your app's view controllers inherit from your custom view controller.

EDIT

As @David Dunham suggests, if all you are trying to do is prevent the app from changing the orientation when the user rotates the device, you can so so easily by implementing the UIViewController method shouldAutorotateToInterfaceOrientation: . That method should return YES for every orientation you want to support, and NO for any that you do not wish to support.

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // only allow portrait orientation
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

Answer 2

从shouldAutorotateToInterfaceOrientation:返回NO会更容易吗？