When I run my project on ios13 xcode11 beta.
[UIApplication sharedApplication].statusBarFrame.size.height
the code returns 0.
what should I do to adapt it to ios13 ?
Use UIStatusBarManager to get the statusBar height in iOS13:
UIStatusBarManager *manager = [UIApplication sharedApplication].keyWindow.windowScene.statusBarManager;
CGFloat height = manager.statusBarFrame.size.height;
SceneDelegate.swift file
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let windowScene = (scene as? UIWindowScene) else { return }
if let statusBarFrame = windowScene.statusBarManager?.statusBarFrame {
print(statusBarFrame)
}
}
As Peter noted on Tamarous's answer, the keyWindow property is deprecated, however on the assumption you're using a single window you can alternatively use:
CGSize statusBarSize = [UIApplication sharedApplication].windows.firstObject.windowScene.statusBarManager.statusBarFrame.size
If you needed to access the nth window, you could do so in a similar manner:
NSInteger i = 0;
CGSize statusBarSize = [UIApplication sharedApplication].windows[i].windowScene.statusBarManager.statusBarFrame.size;
Solution:
let window = UIApplication.shared.windows.filter {$0.isKeyWindow}.first
lazy var statusBarHeight = window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0
Explanation :
You can't use window
in a let
because it doesn't exist when that property is created because it belongs to self. So at init
, self
isn't complete yet. But if you use a lazy var
, then self
and its property window
will be ready by the time you need it.
Or another solution use singleton
:
struct AppConstants {
static let window = UIApplication.shared.windows.filter {$0.isKeyWindow}.first
static let statusBarHeight = window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0
}
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