Question

设备方向更改时，我在旋转子视图时遇到问题。我的情况是：

我有在

中声明的根视图控制器

//in AppDelegate.h
@property MainViewController * myMainViewController;
//in AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.myMainViewController = [[MainViewController alloc] initWithNibName:@"MainViewController" bundle:nil];
    CGRect initFrame = CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, [[UIScreen mainScreen] bounds].size.height);
    self.window = [[UIWindow alloc] initWithFrame:initFrame];
    // Override point for customization after application launch.
    [self.window makeKeyAndVisible];
    self.window.rootViewController = self.myMainViewController;   
    return YES;
}

在根视图控制器中，我以编程方式添加子视图;初始设备方向为纵向，我的子视图的大小设置为帧属性值（0,0,300,600）。

//in MainViewController.h
@property ContentViewController * mySubViewController;
//in MainViewController.m
-(void)viewDidAppear:(BOOL)animated
{   
    self.mySubViewController = [[ContentViewController alloc] initWithNibName:@"ContentViewController" bundle:nil];
    [self.mySubViewController.view setFrame:CGRectMake(0, 0, 300, 600)];
    [self.view addSubview:self.mySubViewController.view];
}

当设备方向发生变化时，我想根据新的设备方向调整我的子视图的大小。如果这是横向，那么我想将我的子视图大小设置为（0,0,600,300）。

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    if(fromInterfaceOrientation==UIInterfaceOrientationLandscapeLeft || fromInterfaceOrientation==UIInterfaceOrientationLandscapeRight)
    {       
        self.mySubViewController.view.frame = CGRectMake(0, 0, 300, 600);       
    }
    else
    {
        self.mySubViewController.view.frame = CGRectMake(0, 0, 600, 300); 
    }
}

但是，结果不是我所期望的。我的子视图的大小是一个大小约为（0,0,300,300）的矩形。有什么问题？

Answer 1

再次查询您的界面方向，而不是预测基于fromOrientation的当前方向，如下所示，

-(void) didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    if (UIInterfaceOrientationIsPortrait(orientation))
    {
        //Your portrait
    }
    else
    {
        //Your Landscape.
    }
}

设备方向更改时，子视图的大小不会正确更改

1 个答案: