UIApplication
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Run a block in background after app resigns activity
Declaration
Swift
public func runInBackground(_ closure: @escaping () -> Void, expirationHandler: (() -> Void)? = nil)
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Get the top most view controller from the base view controller; default param is UIWindow’s rootViewController
Declaration
Swift
public class func topViewController(_ base: UIViewController? = UIApplication.shared.keyWindow?.rootViewController) -> UIViewController?