在iOS中如何获得屏幕的尺寸?

目前,我使用:

lCurrentWidth = self.view.frame.size.width;
lCurrentHeight = self.view.frame.size.height;

在viewWillAppear:和willAnimateRotationToInterfaceOrientation:duration:

这是我第一次看到整个屏幕的大小。第二次我得到的屏幕减去导航栏。


当前回答

我们还必须考虑设备的朝向:

CGFloat screenHeight;
// it is important to do this after presentModalViewController:animated:
if ([[UIApplication sharedApplication] statusBarOrientation] == UIDeviceOrientationPortrait || [[UIApplication sharedApplication] statusBarOrientation] == UIDeviceOrientationPortraitUpsideDown){
    screenHeight = [UIScreen mainScreen].applicationFrame.size.height;
}
else{
    screenHeight = [UIScreen mainScreen].applicationFrame.size.width;
}

其他回答

现代的答案是:

如果你的应用在iPad上支持分屏视图,这个问题就变得有点复杂了。你需要窗口的大小,而不是屏幕的大小,这可能包含2个应用程序。窗口的大小也可能在运行时发生变化。

使用应用程序主窗口的大小:

UIApplication.shared.delegate?.window??.bounds.size ?? .zero

注意:上述方法在启动时可能会在窗口成为关键窗口之前得到错误的值。如果你只需要宽度,非常推荐以下方法:

UIApplication.shared.statusBarFrame.width

使用uisscreen .main.bounds的旧解决方案将返回设备的边界。如果你的应用程序运行在分屏视图模式,它会得到错误的尺寸。

当应用程序包含2个或2个以上的窗口且窗口大小较小时,最热答案中的Self.view.window可能会显示错误的大小。

我们还必须考虑设备的朝向:

CGFloat screenHeight;
// it is important to do this after presentModalViewController:animated:
if ([[UIApplication sharedApplication] statusBarOrientation] == UIDeviceOrientationPortrait || [[UIApplication sharedApplication] statusBarOrientation] == UIDeviceOrientationPortraitUpsideDown){
    screenHeight = [UIScreen mainScreen].applicationFrame.size.height;
}
else{
    screenHeight = [UIScreen mainScreen].applicationFrame.size.width;
}

CGFloat宽度= [[UIScreen mainScreen] bounds].size.width; CGFloat height = [[UIScreen mainScreen]bounds].size.height;

我以前用过这些方便的方法:

- (CGRect)getScreenFrameForCurrentOrientation {
    return [self getScreenFrameForOrientation:[UIApplication sharedApplication].statusBarOrientation];
}

- (CGRect)getScreenFrameForOrientation:(UIInterfaceOrientation)orientation {

    CGRect fullScreenRect = [[UIScreen mainScreen] bounds];

    // implicitly in Portrait orientation.
    if (UIInterfaceOrientationIsLandscape(orientation)) {
      CGRect temp = CGRectZero;
      temp.size.width = fullScreenRect.size.height;
      temp.size.height = fullScreenRect.size.width;
      fullScreenRect = temp;
    }

    if (![[UIApplication sharedApplication] statusBarHidden]) {
      CGFloat statusBarHeight = 20; // Needs a better solution, FYI statusBarFrame reports wrong in some cases..
      fullScreenRect.size.height -= statusBarHeight;
    }

    return fullScreenRect;
} 
NSLog(@"%.0f", [[UIScreen mainScreen] bounds].size.width);
NSLog(@"%.0f", [[UIScreen mainScreen] bounds].size.height);