定向问题

Question

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if ([[UIDevice currentDevice] orientation] == UIInterfaceOrientationIsPortrait(interfaceOrientation)) 
    {
        [self isPortraitSplash];
    }
    else if ([[UIDevice currentDevice] orientation] == UIInterfaceOrientationIsLandscape(interfaceOrientation))
    {
        [self isLandScapeSplash];
    }
    return  YES;
}  

In my methods isPortraitSplash and isLandScapeSplash , i am setting the frames for the view.

When orientation changes, it's always calling isLandScapeSplash - not able to call isPortraitSplash method.

Can any one advise me why this is happening?

Answer 1

Your existing if statement is comparing a BOOL to a UIDeviceOrientation . Your test needs to be:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if (UIInterfaceOrientationIsPortrait(interfaceOrientation)) 
    {
        [self isPotraitSplash];
    }
    else if (UIInterfaceOrientationIsLandscape(interfaceOrientation))
    {
        [self islandScapeSplash];
    }
    return  YES;
}  

UIInterfaceOrientationIsPortrait returns a BOOL , so that's all you need in your if statement condition.

Update: I will also add that I agree with the other answers that it's better to do this work in willRotateToInterfaceOrientation:duration: , instead of shouldAutorotateToInterfaceOrientation: .

But, that isn't the reason your original code was failing. The original code was failing because of the if test comparing the UIDeviceOrientation to the BOOL .

Answer 2

Use - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration instead of shouldAutorotateToInterfaceOrientation , it is guaranteed to be called before a rotation occurs.

Do not remove shouldAutorotateToInterfaceOrientation , return YES for every orientation you want to support.

Answer 3

First of all in

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

you have to declare which all orientations you want to support.

and in

- (BOOL)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    if (UIInterfaceOrientationIsPortrait(interfaceOrientation)) 
    {
        [self isPotraitSplash];
    }
    else if (UIInterfaceOrientationIsLandscape(interfaceOrientation))
    {
        [self islandScapeSplash];
    }
}

you have to set the frames or any other for layout changes, and use like above.