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

在iOS中如何获得屏幕的尺寸?

你所发布的代码的问题是，你指望视图的大小与屏幕的大小相匹配，正如你所看到的，情况并不总是这样。如果你需要屏幕大小，你应该查看代表屏幕本身的对象，如下所示:

CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height;

拆分视图更新:在评论中，Dmitry问道:

如何在分屏视图中获取屏幕的大小?

上面给出的代码报告屏幕的大小，即使在分屏模式下也是如此。当你使用分屏模式时，应用程序的窗口会发生变化。如果上面的代码没有提供您所期望的信息，那么就像OP一样，您找错对象了。在这种情况下，你应该看着窗口而不是屏幕，就像这样:

CGRect windowRect = self.view.window.frame;
CGFloat windowWidth = windowRect.size.width;
CGFloat windowHeight = windowRect.size.height;

斯威夫特4.2

let screenRect = UIScreen.main.bounds
let screenWidth = screenRect.size.width
let screenHeight = screenRect.size.height

// split screen            
let windowRect = self.view.window?.frame
let windowWidth = windowRect?.size.width
let windowHeight = windowRect?.size.height

这是非常非常容易得到你的设备大小，以及考虑方向:

// grab the window frame and adjust it for orientation
UIView *rootView = [[[UIApplication sharedApplication] keyWindow] 
                                   rootViewController].view;
CGRect originalFrame = [[UIScreen mainScreen] bounds];
CGRect adjustedFrame = [rootView convertRect:originalFrame fromView:nil];

如果你想让屏幕宽度/高度与设备方向无关(只适用于从横向方向启动的视图控制器的纵向大小):

CGFloat screenWidthInPoints = [UIScreen mainScreen].nativeBounds.size.width/[UIScreen mainScreen].nativeScale;
CGFloat screenHeightInPoints = [UIScreen mainScreen].nativeBounds.size.height/[UIScreen mainScreen].nativeScale;

[UIScreen mainScreen]。物理屏幕的边界矩形，以像素为单位。这个矩形是基于设备的肖像向上方向。该值不会随着设备的旋转而改变。

你可以把这些宏放在你的pch文件中，并使用"SCREEN_WIDTH"在项目的任何地方使用

#define SCREEN_WIDTH                ((([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortrait) || ([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortraitUpsideDown)) ? [[UIScreen mainScreen] bounds].size.width : [[UIScreen mainScreen] bounds].size.height)

和“SCREEN_HEIGHT”

#define SCREEN_HEIGHT               ((([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortrait) || ([UIApplication sharedApplication].statusBarOrientation ==   UIInterfaceOrientationPortraitUpsideDown)) ? [[UIScreen mainScreen] bounds].size.height : [[UIScreen mainScreen] bounds].size.width)

使用示例:

CGSize calCulateSizze ;
calCulateSizze.width = SCREEN_WIDTH/2-8;
calCulateSizze.height = SCREEN_WIDTH/2-8;

下面是一个快速获取屏幕尺寸的方法:

print(screenWidth)
print(screenHeight)

var screenWidth: CGFloat {
    if UIInterfaceOrientationIsPortrait(screenOrientation) {
        return UIScreen.mainScreen().bounds.size.width
    } else {
        return UIScreen.mainScreen().bounds.size.height
    }
}

var screenHeight: CGFloat {
    if UIInterfaceOrientationIsPortrait(screenOrientation) {
        return UIScreen.mainScreen().bounds.size.height
    } else {
        return UIScreen.mainScreen().bounds.size.width
    }
}

var screenOrientation: UIInterfaceOrientation {
    return UIApplication.sharedApplication().statusBarOrientation
}

它们作为标准函数包含在:

https://github.com/goktugyil/EZSwiftExtensions