如何获取 iPhone 屏幕尺寸来进行计算?
12 回答
您可以bounds
在 UIScreen 的实例上使用该属性:
CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;
CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;
大多数人会想要主屏幕。如果您有一个连接到电视的设备,您可能希望遍历 UIScreens 并获取每个设备的边界。
UIScreen 类文档中的更多信息。
这是一个“迅速”的解决方案:(为 swift 3.x 更新)
let screenWidth = UIScreen.main.fixedCoordinateSpace.bounds.width
let screenHeight = UIScreen.main.fixedCoordinateSpace.bounds.height
这以点而不是像素报告,并且“始终以纵向向上的方向反映设备的屏幕尺寸” (Apple Docs)。无需为 UIAnnoyinglyLongDeviceOrientation 烦恼!
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
这里的宽度和高度将根据屏幕是纵向还是横向来翻转值。
以下是如何以像素而不是点为单位测量屏幕尺寸:
let screenWidthInPixels = UIScreen.main.nativeBounds.width
let screenHeightInPixels = UIScreen.main.nativeBounds.height
这也“基于纵向向上的设备。该值不会随着设备的旋转而改变。” (苹果文档)
请注意,对于 swift 2.x 及更低版本,您应该使用UIScreen.mainScreen()
而不是UIScreen.main
使用此代码在 iOS8 中修复:
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;
}
与上面类似,但略显冗长:
CGFloat screenWidth = [[UIScreen mainScreen] bounds].size.width;
CGFloat screenHeight = [[UIScreen mainScreen] bounds].size.height;
如果您想知道某个视图的大小或者您想知道设备的屏幕大小,请使用 属性bounds
。UIView
[[UIScreen mainScreen] bounds]
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);
}
这是获取屏幕尺寸的快速方法:
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
}
这些在此处作为标准功能包含在内。
这也在文档中。
[[UIScreen mainScreen] bounds] 返回物理屏幕尺寸,不考虑设备方向。
如果您需要根据当前方向获取屏幕尺寸,请查看如何获取与方向相关的屏幕高度和宽度?
假设您要考虑当前方向,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;
}
使用UIScreen
's bounds 是一种很好的方法,但您应该使用CGGeometry
函数来访问 aCGRect
的数据,而不是直接访问它。请参阅CGGeometry
文档。
CGRect screenBound = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = CGRectGetWidth(screenBound);
CGFloat screenHeight = CGRectGetHeight(screenBound);
var PT: CGFloat = 0;
override func viewDidLoad() {
super.viewDidLoad()
setPoints();
}
func setPoints() {
let screenBounds = UIScreen.main.bounds
let screenScale = UIScreen.main.scale
let screenSize = CGSize(width: screenBounds.size.width * screenScale, height: screenBounds.size.height * screenScale)
let nativeBounds = UIScreen.main.nativeBounds
let nativeScale = UIScreen.main.nativeScale
let pxScreenWidth:CGFloat = nativeBounds.width;
let ptScreenWidth:CGFloat = screenBounds.width;
PT = pxScreenWidth/ptScreenWidth/nativeScale;
}
如何使用:
let label: UILabel = UILabel(frame: CGRect(x: 15 * PT, y: 10 * PT, width: self.view.frame.width - 30 * PT, height: self.view.frame.height - 20 * PT))
对于 Xamarin 同胞 - 这是在 Xamarin.iOS + C# 中获取屏幕大小的方法:
var screenBound = UIScreen.MainScreen.Bounds;
var screenSize = screenBound.Size;
var height = screenSize.Height;
var width = screenSize.Width;