如何使用iOS上的代码获取屏幕大小？

Question

如何获得iPhone屏幕尺寸来计算？

Answer 1

您可以在UIScreen的实例上使用bounds属性：

CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;  
CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;

大多数人都想要主屏幕;如果你有一台设备连接到电视，你可能想要迭代UIScreens并获得每个设备的界限。

更多信息在UIScreen class docs。

Answer 2

假设您想考虑当前的方向，请使用：

float screen_width;
float screen_height;
float vers = [[[UIDevice currentDevice] systemVersion] floatValue];
UIInterfaceOrientation orient = [UIApplication sharedApplication].statusBarOrientation;
if (vers < 8 && UIInterfaceOrientationIsLandscape(orient))
{
    screen_height = [[UIScreen mainScreen] bounds].size.width;
    screen_width = [[UIScreen mainScreen] bounds].size.height;
}
else
{
    screen_width = [[UIScreen mainScreen] bounds].size.width;
    screen_height = [[UIScreen mainScreen] bounds].size.height;
}

Answer 3

对于同伴Xamarians - 这是你可以在Xamarin.iOS + C＃中获得屏幕尺寸的方式：

var screenBound = UIScreen.MainScreen.Bounds;
var screenSize = screenBound.Size;
var height = screenSize.Height;
var width = screenSize.Width;

Answer 4

这是一个'迅捷'的解决方案:(更新为swift 3.x）

let screenWidth  = UIScreen.main.fixedCoordinateSpace.bounds.width
let screenHeight = UIScreen.main.fixedCoordinateSpace.bounds.height

这报告的点数不是像素，“总是以纵向向上反映设备的屏幕尺寸”(Apple Docs)。无需烦恼UIAnnoyinglyLongDeviceOrientation！

如果您希望宽度和高度反映设备方向：

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

这里宽度和高度将根据屏幕是纵向还是横向显示翻转值。

以下是如何以像素为单位测量屏幕尺寸而不是点：

let screenWidthInPixels = UIScreen.main.nativeBounds.width
let screenHeightInPixels = UIScreen.main.nativeBounds.height

这也“基于设备的纵向向上。当设备旋转时，该值不会改变。”(Apple Docs)

请注意，对于swift 2.x及更低版本，你应该使用UIScreen.mainScreen()而不是UIScreen.main

Answer 5

使用此代码修复iOS8：

float SW;
float SH;
UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
if (( [[[UIDevice currentDevice] systemVersion] floatValue]<8)  && UIInterfaceOrientationIsLandscape(orientation))
{
    SW = [[UIScreen mainScreen] bounds].size.height;
    SH = [[UIScreen mainScreen] bounds].size.width;
}
else
{
    SW = [[UIScreen mainScreen] bounds].size.width;
    SH = [[UIScreen mainScreen] bounds].size.height;
}

Answer 6

如果您想知道某个视图或bounds的大小，如果您想知道设备的屏幕大小，请使用UIView的属性[[UIScreen mainScreen] bounds]。

Answer 7

与上述相似但略显冗长：

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

Answer 8

float screen_Height;
float screen_Width;

if ([[[UIDevice currentDevice] systemVersion] floatValue]  >= 8) {
    screen_Height = [[UIScreen mainScreen] bounds].size.height;
    screen_Width = [[UIScreen mainScreen] bounds].size.width;
} else {
    screen_Height = ((([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortrait) || ([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortraitUpsideDown)) ? [[UIScreen mainScreen] bounds].size.height : [[UIScreen mainScreen] bounds].size.width);
    screen_Width = ((([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortrait) || ([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortraitUpsideDown)) ? [[UIScreen mainScreen] bounds].size.width : [[UIScreen mainScreen] bounds].size.height);
}

Answer 9

这是获取屏幕尺寸的Swift方法：

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
}

这些包括作为标准函数here。

这也在文档中。

Answer 10

[[UIScreen mainScreen] bounds]返回物理屏幕尺寸，而不考虑设备方向。

如果您需要根据当前方向获取屏幕尺寸，请查看How to get orientation-dependent height and width of the screen?

Answer 11

使用UIScreen的边界是一个很好的方法，但你应该使用CGGeometry函数来访问CGRect的数据，而不是直接访问它。参见CGGeometry docs。

CGRect screenBound = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = CGRectGetWidth(screenBound);
CGFloat screenHeight = CGRectGetHeight(screenBound);