如何在 iOS 中获取屏幕宽度和高度？

如何在 iOS 中获取屏幕的尺寸？

您发布的代码的问题是您指望视图大小与屏幕大小相匹配，而且正如您所见，情况并非总是如此。如果您需要屏幕尺寸，您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，德米特里问：

如何在拆分视图中获取屏幕大小？

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。当您使用分屏模式时，您的应用程序的窗口会发生变化。如果上面的代码没有为您提供您期望的信息，那么就像 OP 一样，您正在查看错误的对象。但是，在这种情况下，您应该查看窗口而不是屏幕，如下所示：

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

---

小心，[UIScreen mainScreen] 也包含状态栏，如果您想检索应用程序的框架（不包括状态栏），您应该使用

+ (CGFloat) window_height   {
    return [UIScreen mainScreen].applicationFrame.size.height;
}

+ (CGFloat) window_width   {
    return [UIScreen mainScreen].applicationFrame.size.width;
}

---

我已经将上面的一些 Objective-C 答案翻译成 Swift 代码。每个翻译都参考原始答案进行。

主要答案

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

##Simple Function Answer

func windowHeight() -> CGFloat {
    return UIScreen.main.bounds.size.height
}

func windowWidth() -> CGFloat {
    return UIScreen.main.bounds.size.width
}

##Device Orientation Answer

let screenHeight: CGFloat
let statusBarOrientation = UIApplication.shared.statusBarOrientation
// it is important to do this after presentModalViewController:animated:
if (statusBarOrientation != .portrait
    && statusBarOrientation != .portraitUpsideDown) {
    screenHeight = UIScreen.main.bounds.size.width
} else {
    screenHeight = UIScreen.main.bounds.size.height
}

##Log Answer

let screenWidth = UIScreen.main.bounds.size.width
let screenHeight = UIScreen.main.bounds.size.height
println("width: \(screenWidth)")
println("height: \(screenHeight)")

---

我以前使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;
} 

---

我意识到这是一篇旧文章，但有时我发现#define 像这样的常量很有用，所以我不必担心：

#define DEVICE_SIZE [[[[UIApplication sharedApplication] keyWindow] rootViewController].view convertRect:[[UIScreen mainScreen] bounds] fromView:nil].size

无论设备方向如何，上述常量都应返回正确的大小。然后获取尺寸很简单：

lCurrentWidth = DEVICE_SIZE.width;
lCurrentHeight = DEVICE_SIZE.height;

---

获取设备尺寸并考虑方向非常非常容易：

// 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];

---

我们还必须考虑设备的方向：

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;
}

---

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

---

利用这些Structs了解有关 Swift 3.0 中当前设备的有用信息

struct ScreenSize { // Answer to OP's question
    
    static let SCREEN_WIDTH         = UIScreen.main.bounds.size.width
    static let SCREEN_HEIGHT        = UIScreen.main.bounds.size.height
    static let SCREEN_MAX_LENGTH    = max(ScreenSize.SCREEN_WIDTH, ScreenSize.SCREEN_HEIGHT)
    static let SCREEN_MIN_LENGTH    = min(ScreenSize.SCREEN_WIDTH, ScreenSize.SCREEN_HEIGHT)
    
}

struct DeviceType { //Use this to check what is the device kind you're working with
    
    static let IS_IPHONE_4_OR_LESS  = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.SCREEN_MAX_LENGTH < 568.0
    static let IS_IPHONE_SE         = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.SCREEN_MAX_LENGTH == 568.0
    static let IS_IPHONE_7          = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.SCREEN_MAX_LENGTH == 667.0
    static let IS_IPHONE_7PLUS      = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.SCREEN_MAX_LENGTH == 736.0
    static let IS_IPHONE_X          = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.SCREEN_MAX_LENGTH == 812.0
    static let IS_IPAD              = UIDevice.current.userInterfaceIdiom == .pad && ScreenSize.SCREEN_MAX_LENGTH == 1024.0
    
}


struct iOSVersion { //Get current device's iOS version
    
    static let SYS_VERSION_FLOAT  = (UIDevice.current.systemVersion as NSString).floatValue
    static let iOS7               = (iOSVersion.SYS_VERSION_FLOAT >= 7.0 && iOSVersion.SYS_VERSION_FLOAT < 8.0)
    static let iOS8               = (iOSVersion.SYS_VERSION_FLOAT >= 8.0 && iOSVersion.SYS_VERSION_FLOAT < 9.0)
    static let iOS9               = (iOSVersion.SYS_VERSION_FLOAT >= 9.0 && iOSVersion.SYS_VERSION_FLOAT < 10.0)
    static let iOS10              = (iOSVersion.SYS_VERSION_FLOAT >= 10.0 && iOSVersion.SYS_VERSION_FLOAT < 11.0)
    static let iOS11              = (iOSVersion.SYS_VERSION_FLOAT >= 11.0 && iOSVersion.SYS_VERSION_FLOAT < 12.0)
    static let iOS12              = (iOSVersion.SYS_VERSION_FLOAT >= 12.0 && iOSVersion.SYS_VERSION_FLOAT < 13.0)
    static let iOS13              = (iOSVersion.SYS_VERSION_FLOAT >= 13.0 && iOSVersion.SYS_VERSION_FLOAT < 14.0)
    static let iOS14              = (iOSVersion.SYS_VERSION_FLOAT >= 14.0 && iOSVersion.SYS_VERSION_FLOAT < 15.0)
    static let iOS15              = (iOSVersion.SYS_VERSION_FLOAT >= 15.0 && iOSVersion.SYS_VERSION_FLOAT < 16.0)
    
}

---

在这里我更新了 swift 3

从 iOS 9 弃用的 applicationFrame

在 swift 三中，他们删除了 () 并且更改了一些命名约定，您可以参考这里 Link

func windowHeight() -> CGFloat {
    return UIScreen.main.bounds.size.height
}

func windowWidth() -> CGFloat {
    return UIScreen.main.bounds.size.width
}

---

现代答案：

如果你的应用支持 iPad 上的拆分视图，这个问题就会变得有点复杂。您需要窗口的大小，而不是屏幕的大小，它可能包含 2 个应用程序。窗口的大小在运行时也可能会有所不同。

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。如果您只需要宽度，非常推荐以下方法：

UIApplication.shared.statusBarFrame.width

使用 UIScreen.main.bounds 的旧解决方案将返回设备的边界。如果您的应用程序在拆分视图模式下运行，则会得到错误的尺寸。

当应用程序包含 2 个或更多窗口并且窗口尺寸较小时，最热门答案中的 self.view.window 可能会出现尺寸错误。

---

如果您想要屏幕宽度/高度而不考虑设备方向（适用于调整从横向启动的仅纵向视图控制器）：

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

[UIScreen mainScreen].nativeBounds <-- 来自文档 --> 物理屏幕的边界矩形，以像素为单位。此矩形基于纵向向上的设备。该值不会随着设备的旋转而改变。

---

这是获取屏幕尺寸的快速方法：

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
}

这些作为标准功能包含在：

https://github.com/goktugyil/EZSwiftExtensions

---

iOS 13+ 答案 (source of the code finding the key window)：

guard let window = UIApplication.shared.windows.first(where: { $0.isKeyWindow }) else {
    return
}

let windowWidth = window.frame.width
let windowHeight = window.frame.height

---

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

---

迅捷3.0

宽度

UIScreen.main.bounds.size.width

身高

UIScreen.main.bounds.size.height

---

对于 iPad 拆分窗口，[[UIScreen mainScreen] bounds] 不起作用，请改用 [UIApplication sharedApplication].delegate.window.bounds。

---

您可以将这些宏放在您的 pch 文件中，并使用“SCREEN_WIDTH”在项目中的任何位置使用

#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;

---