UIScreen 边界小于外部屏幕上的预期

Question

我想在外接屏幕（现在是使用 Air Server 的 MacBook Pro）上全屏显示内容，在平板电脑上有一个屏幕。

我正在使用 https://github.com/quellish/AirPlayStoryboards 中的一个示例 - 这很棒。但是，我发现两个屏幕都没有显示全屏，因为 UIScreen 的边界返回时太小了——iPad 显示的有点小（信箱化），而 iPad 屏幕只显示 1/4左上角的屏幕（原点）

知道这是为什么吗？代码：

- (void) application:(UIApplication *)__unused application didConnectScreen:(UIScreen *) screen
{

UIStoryboard        *storyboard     = nil;
UIWindow            *screenWindow   = nil;
UIViewController    *tvViewController = nil;

// Set up external screen
UIScreen *secondaryScreen = [UIScreen screens][1];
UIScreen *primaryScreen = [UIScreen screens][0];

NSLog(@"Screen 1 (iPad): %@", primaryScreen); //print the bounds of the iPad
NSLog(@"Screen 2 (MacBook): %@:", secondaryScreen); //print the bounds and size of the MacBook

UIScreenMode *screenMode = [[secondaryScreen availableModes] lastObject];
CGRect bounds = secondaryScreen.bounds;

// Create new outputWindow
screenWindow = [[UIWindow alloc] initWithFrame:bounds];
screenWindow.screen = secondaryScreen;
screenWindow.screen.currentMode = screenMode;
[screenWindow makeKeyAndVisible];


[screenWindow setScreen:screen];

storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle bundleForClass:[self class]]];
tvViewController = [storyboard instantiateViewControllerWithIdentifier:@"TVViewController"];

[screenWindow setClipsToBounds:YES];
[screenWindow setRootViewController:tvViewController];
[screenWindow setHidden:NO];

//  // If you do not retain the window, it will go away and you will see nothing.
[[self windows] addObject:screenWindow];
}

Log语句return如下：

Screen 1 (iPad): <UIScreen: 0x1567def0; bounds = {{0, 0}, {480, 320}}; mode = <UIScreenMode: 0x1567dd60; size = 1024.000000 x 768.000000>>

Screen 2 (MacBook): <UIScreen: 0x15680280; bounds = {{0, 0}, {640, 400}}; mode = <UIScreenMode: 0x156804a0; size = 1280.000000 x 800.000000>>:

有谁知道我该如何解决这个问题？

Answer 1

您可以这样获取屏幕尺寸：

    UIScreen *secondaryScreen = [UIScreen screens][1];
    UIScreenMode *secondaryScreenMode = [[secondaryScreen availableModes] objectAtIndex: 0];
    CGSize sizeSecendaryScreen = secondaryScreenMode.size;
    screenWindow = [[UIWindow alloc] initWithFrame:CGRectMake(0,0, sizeSecendaryScreen.width, sizeSecendaryScreen.height)];

参考：Setting UIScreen's mode / resolution

Answer 2

我想通了。这与 [UIScreen mainScreen].bounds.size 在 iOS8 中变得依赖方向有关。我从这个 post:

得到了线索

Is [UIScreen mainScreen].bounds.size becoming orientation-dependent in iOS8?

Answer 3

在我的例子中，没有我想要支持的特定分辨率的启动图像。例如：如果要支持 iPhone5 我们需要添加 iPhone5 大小的启动图像。请检查您的 Xcode 是否拥有所有必需的启动图像。这可能是您的解决方案。就我而言，它对我有用！

UIScreen 边界小于外部屏幕上的预期

UIScreen bounds smaller than expected on external screen

screen

objective-c

ipad

ios

uiscreen