旋转 UIViewController 以抵消 UIInterfaceOrientation 的变化

Question

我对此进行了很多搜索，但找不到任何可以帮助我的东西。

我有一个 UIViewController 包含在另一个 UIViewController 中。当父 UIViewController 旋转时，比如从 Portrait 旋转到 LandscapeLeft，我想让它看起来好像子 UIViewController 没有旋转。也就是说。我希望孩子对天空有相同的方向，无论父母的方向如何。如果它有一个在纵向中直立的 UIButton，我希望按钮的右侧在 UIInterfaceOrientationLandscapeLeft 中“向上”。

这可能吗？目前，我正在做这样非常恶心的事情：

-(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)))
    {

    }   
}

这看起来完全是对代码的浪费。此外，我计划使用 CGAffineTransform （如此处引用的： http://www.crystalminds.nl/ ?p=1102），但我很困惑是否应该更改视图的尺寸以匹配旋转后的尺寸。

这里最大的噩梦是您必须跟踪全局“方向”变量。如果不这样做，幻觉就会消失，ViewController 就会旋转成任何东西。

我真的需要一些帮助，谢谢！

Answer 1

您能做的最好的事情就是根据您的界面方向更改您的子视图框架的框架。你可以这样做：

 #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];
}

希望这有帮助。

Answer 2

我意识到了一些事情..假设我们的项目有多层 ViewController （就像您将其他视图控制器的子视图添加到您的视图控制器中一样）

willRotateToInterfaceOrientation:duration 方法将不会为 ViewController 的第二层调用...

所以我什么所做的是，在我从最顶层初始化我的第二层视图控制器之后，然后当在最顶层调用 willRotateToInterfaceOrientation:duration 方法时，我也会为第二层视图控制器调用 willRotateToInterfaceOrientation:duration