使用横向时UIWindow的大小错误

问题描述

我有一个空的应用程序，没有涉及故事板或xib。我希望有一个隐藏的状态栏，只支持横向。同样，我不想仅在代码中进行这些更改，也不要触摸Info.plist。

I have an empty application and there is no storyboard or xib involved. I want to have a hidden status bar and support only landscape orientation. Again, I wan't to make those changes only within code and don't touch the Info.plist.

我创建了一个带有控制器的UIWindow，该控制器表示唯一支持的方向是横向。在这种情况下，我的UIWindow是在纵向模式的维度中创建的，不会旋转。预期的结果将是一个完全是青色的屏幕。

I create a UIWindow with a controller that says the only supported orientation is landscape. In that case my UIWindow is created in the dimension of portrait mode and doesn't rotate. The expected result would be a screen that is completely cyan.

这是我的代表：

#import "AppDelegate.h"
#import "AppViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
  self.window.backgroundColor = [UIColor cyanColor];
  self.window.rootViewController = [[AppViewController alloc] init];
  [self.window makeKeyAndVisible];
  return YES;
}

@end

这是我的控制器：

#import "AppViewController.h"

@implementation AppViewController

- (BOOL)shouldAutorotate {
  return YES;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
  return UIInterfaceOrientationLandscapeLeft;
}

- (BOOL)prefersStatusBarHidden {
  return YES;
}

- (NSUInteger)supportedInterfaceOrientations {
  return UIInterfaceOrientationMaskLandscape;
}

@end

我尝试过的远

如果我在调用makeKeyAndVisible后设置了rootViewController，那么一切似乎都起作用。

What I've tried so far

If I set the rootViewController after calling makeKeyAndVisible everything seems to work at first.

self.window.backgroundColor = [UIColor cyanColor];
[self.window makeKeyAndVisible];
self.window.rootViewController = [[AppViewController alloc] init];

还有一些问题。首先，我不喜欢这个，因为它似乎非常脆弱。第二个问题是在一个更复杂的应用程序中将GLKViewController设置为rootViewController我得到以下结果（预计左边没有黑色区域）：

There are still some issues. First of all I don't like this since it seems to be very fragile. Second problem is that in a more complex application that sets a GLKViewController as the rootViewController I get the following result (expected would be no black area on the left):

看起来状态栏没有隐藏足够早。几个手势识别器处于活动状态，在GLKViewController中单击黑色区域会产生以下日志消息：

It looks like the status bar is not hidden early enough. Several gesture recognizers are active and in the GLKViewController and clicking on the black area yields the following log message:

我还执行了各种其他更改，例如附加空的UIViewController并将我的视图添加为子视图。在这种情况下，我的视图看起来是正确的，但窗口仍然使用了错误的尺寸。

I also performed various other changes, like attaching an empty UIViewController and adding my view as a sub-view. In that case my view looks correct but the window is still using the wrong dimensions.

如果我没有覆盖视图控制器中的supportedInterfaceOrientations方法，那么一切都旋转正确。但这当然不是我想要的。

Everything rotates correct if I do not override the supportedInterfaceOrientations methods in my view controller. But that is of course not what I want.

推荐答案

从横向应用时>肖像模式UIScreen在iOS 8中具有纵向边界（仅当您在app开关面板中没有此应用时，因为iOS 8会进行一些缓存）。即使用 makeKeyAndVisible 显示窗口也不会改变它的帧。但是根据 AppViewController 可用的方向更改 [UIScreen mainScreen] .bounds 。

When you run landscape app from portrait mode UIScreen has portrait bounds in iOS 8 (only if you haven't this app in app switch panel, as iOS 8 makes some cache). Even displaying window with makeKeyAndVisible doesn't change it's frame. But it changes [UIScreen mainScreen].bounds according to AppViewController avaliable orientation.

#import "AppDelegate.h"
#import "AppViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  // Portrait bounds at this point
  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

  self.window.backgroundColor = [UIColor cyanColor];
  self.window.rootViewController = [[AppViewController alloc] init];
  [self.window makeKeyAndVisible];
  return YES;
}

@end

所以让我们改变窗口的框架 [self.window makeKeyAndVisible]

So let's change window's frame after [self.window makeKeyAndVisible]

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [UIWindow new];
    self.window.backgroundColor = [UIColor cyanColor];
    self.window.rootViewController = [[AppViewController alloc] init];
    [self.window makeKeyAndVisible];

    // Here it is
    self.window.frame = [UIScreen mainScreen].bounds;
    return YES;
}

我认为这是iOS 8的错误。

I think that it is iOS 8 bug.

这篇关于使用横向时UIWindow的大小错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！