问题
I've been searching a lot on this, and can't find anything to help me.
I have a UIViewController contained within another UIViewController. When the parent UIViewController rotates, say from Portrait to LandscapeLeft, I want to make it look as though the child didn't rotate. That is to say. I want the child to have the same orientation to the sky regardless of the parent's orientation. If it has a UIButton that's upright in Portrait, I want the right-side of the button to be "up" in UIInterfaceOrientationLandscapeLeft.
Is this possible? Currently, I'm doing really gross stuff like this:
-(void) rotate:(UIInterfaceOrientation)fromOrientation: toOr:(UIInterfaceOrientation)toOrientation
{
if(((fromOrientation == UIInterfaceOrientationPortrait) && (toOrientation == UIInterfaceOrientationLandscapeRight))
|| ((fromOrientation == UIInterfaceOrientationPortraitUpsideDown) && (toOrientation == UIInterfaceOrientationLandscapeLeft)))
{
}
if(((fromOrientation == UIInterfaceOrientationLandscapeRight) && (toOrientation == UIInterfaceOrientationPortraitUpsideDown))
|| ((fromOrientation == UIInterfaceOrientationLandscapeLeft) && (toOrientation == UIInterfaceOrientationPortrait)))
{
}
if(((fromOrientation == UIInterfaceOrientationPortrait) && (toOrientation == UIInterfaceOrientationLandscapeLeft))
|| ((fromOrientation == UIInterfaceOrientationPortraitUpsideDown) && (toOrientation == UIInterfaceOrientationLandscapeRight)))
{
}
if(((fromOrientation == UIInterfaceOrientationLandscapeLeft) && (toOrientation == UIInterfaceOrientationPortraitUpsideDown))
|| ((fromOrientation == UIInterfaceOrientationLandscapeRight) && (toOrientation == UIInterfaceOrientationPortrait)))
{
}
if(((fromOrientation == UIInterfaceOrientationPortrait) && (toOrientation == UIInterfaceOrientationPortraitUpsideDown))
|| ((fromOrientation == UIInterfaceOrientationPortraitUpsideDown) && (toOrientation == UIInterfaceOrientationPortrait)))
{
}
if(((fromOrientation == UIInterfaceOrientationLandscapeLeft) && (toOrientation == UIInterfaceOrientationLandscapeRight))
|| ((fromOrientation == UIInterfaceOrientationLandscapeRight) && (toOrientation == UIInterfaceOrientationLandscapeLeft)))
{
}
}
which seems like a perfectly good waste of code. Furthermore, I was planning on using CGAffineTransform (like cited here: http://www.crystalminds.nl/?p=1102) but I'm confused about whether I should change the view's dimensions to match what they will be after the rotation.
The big nightmare here is that you have to keep track of a global "orientation" variable. If you don't, the illusion is lost and the ViewController is rotated into whatever.
I could really use some help on this, thanks!
回答1:
The best thing you can do is to change the frames of ur subview frames according to ur interface orientations. You can do it like:
#pragma mark -
#pragma mark InterfaceOrientationMethods
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown || interfaceOrientation == UIInterfaceOrientationLandscapeRight || interfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}
//--------------------------------------------------------------------------------------------------------------------------------------------------------------------
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
[super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
if(toInterfaceOrientation == UIInterfaceOrientationPortrait || toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown){
//self.view = portraitView;
[self changeTheViewToPortrait:YES andDuration:duration];
}
else if(toInterfaceOrientation == UIInterfaceOrientationLandscapeRight || toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft){
//self.view = landscapeView;
[self changeTheViewToPortrait:NO andDuration:duration];
}
}
//--------------------------------------------------------------------------------------------------------------------------------------------------------------------
- (void) changeTheViewToPortrait:(BOOL)portrait andDuration:(NSTimeInterval)duration{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:duration];
if(portrait){
//change the view and subview frames for the portrait view
}
else{
//change the view and subview frames for the landscape view
}
[UIView commitAnimations];
}
Hope this helps.
回答2:
i realised something.. let's say our project have multiple layer of ViewController (as in if you add subview of other view controller to your view controller)
willRotateToInterfaceOrientation:duration method will not be called for the 2nd layer of ViewController...
so what i did was, after i initialise my 2nd layer view controller from my top most layer, then when willRotateToInterfaceOrientation:duration method is called on the top-most layer, i will call willRotateToInterfaceOrientation:duration for 2nd layer view controller as well
来源：https://stackoverflow.com/questions/2489845/rotate-uiviewcontroller-to-counteract-changes-in-uiinterfaceorientation