iOS強制splitViewController旋轉到橫向

Question

我有一個支持橫向和縱向模式的分割視圖控制器。當詳細視圖控制器處於特定視圖時，我將禁用縱向並僅允許橫向方向。但是，如果用戶離開該特定視圖，將該設備旋轉爲縱向，然後返回到該特定視圖，該縱向仍然是縱向。我需要它自動旋轉回風景。以下是我正在使用的。這些方法都是從我的子類UISplitViewController中調用的，以便方向可以取決於視圖控制器。

#pragma mark - Orientation 

- (BOOL)shouldAutorotate 
{ 
    // Allow view controller to rotate between landscapes 
    return YES; 
} 

- (NSUInteger)supportedInterfaceOrientations 
{ 
    // Return supported interface orientation 
    return UIInterfaceOrientationMaskLandscape; 
} 

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation 
{ 
    // Return preferred orientation 
    return UIInterfaceOrientationLandscapeLeft; 
} 

Answer 1

// This has worked for me - assumes ARC is enabled 

- (void)forceLandscape 
{ 
    UIDevice *myDevice = [UIDevice currentDevice]; 
    if([myDevice respondsToSelector:@selector(setOrientation:)]) 
    { 
     NSInteger param  = UIInterfaceOrientationLandscapeRight; 
     NSMethodSignature *signature = [[myDevice class] instanceMethodSignatureForSelector:@selector(setOrientation:)]; 
     NSInvocation  *invocation = [NSInvocation invocationWithMethodSignature:signature]; 
     [invocation setTarget:myDevice]; 
     [invocation setSelector:@selector(setOrientation:)]; 
     [invocation setArgument:&param 
         atIndex:2]; 
     [invocation invoke]; 
    } 
}