ios - 不能自动改变方向

Question

我有一个 TabBarController，里面有两个 UIViewControllers，为了能适应景观，我在第一个 ViewController 中添加了以下代码:

 - (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{    return YES; }

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
if (toInterfaceOrientation == UIInterfaceOrientationPortrait || toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
      //handle with portait
}else{
      //handle with landscape
   }
}

实际上它有效，但我遇到了一个问题:当我在第二个 ViewController 中改变方向并返回第一个 ViewController 时，它不能自动改变方向，我需要手动改变方向，所以我想要一个解决方案来避免这个

Answer 1

[[UIDevice currentDevice] performSelector:NSSelectorFromString(@"setOrientation:") withObject:(id)UIInterfaceOrientationLandscapeLeft];
[[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft animated:true];

这样就可以了。并且不要忘记在此方法调用后更改 View 的框架，例如:

- (void)viewDidLoad
{
    [super viewDidLoad];

    [[UIDevice currentDevice] performSelector:NSSelectorFromString(@"setOrientation:") withObject:(id)UIInterfaceOrientationLandscapeLeft];
    [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft animated:true];

    // Screen is turned now, change all views their frames
    [myButton setFrame:CGRectMake(480, 20, 0, 0)];
    [myLabel setFrame:CGRectMake(480, 50, 0, 30)];
}