Hide UIStatusBar without removing the space alloca

问题:

I have picture examples to show you what I want and what I have right now.

First, here is an example of what I'm trying to do, from the Slack app:

The statusbar is normally displayed:

But when you open the side drawer, it goes away:

I can display the status bar in my app:

But when I hide it, it also hides the frame, so there is less space at the top than before:

It looks wonky to remove space from the top whenever the side drawer opens, but it also looks bad to not hide the status bar since the menu has a different background color. How can I hide the text on the status bar while keeping the space for it still there?

回答1:

I think you want something like the following (In Swift, Deploy target is 9.0):

To hide it:

    UIApplication.sharedApplication().setStatusBarHidden(true, withAnimation: .Fade)
    let appFrame:CGRect = UIScreen.mainScreen().applicationFrame

    UIView.animateWithDuration(0.3, animations: {
        self.navigationController?.navigationBar.frame = self.navigationController!.navigationBar.bounds
        self.view.window!.frame = CGRectMake(0, 0, appFrame.size.width, appFrame.size.height);
    })

To show it again:

    let appFrame:CGRect = UIScreen.mainScreen().applicationFrame
    UIApplication.sharedApplication().setStatusBarHidden(false, withAnimation: .Fade)

    UIView.animateWithDuration(0.3, animations: {
        self.navigationController?.navigationBar.frame = self.navigationController!.navigationBar.bounds
        self.view.window!.frame = CGRectMake(0, 0, appFrame.size.width, appFrame.size.height-0.00001);
    })

I'm not sure you will run into the same issue as I will, but when I tested the code I originally didn't have that "-0.00001" and the transition was not smooth but that little subtraction fixed it. Not sure why.

回答2:

I did succeed with this solution.

extension UIApplication {
    var statusBarView: UIView? {
        if responds(to: Selector("statusBar")) {
            return value(forKey: "statusBar") as? UIView
        }
        return nil
    }

    func hideStatusBar() {
        statusBarView?.frame.origin.y = -200
        statusBarView?.isHidden = true
    }

    func showStatusBar() {
        statusBarView?.frame.origin.y = 0
        statusBarView?.isHidden = false
    }
}

回答3:

I couldn't get the accepted answer to work on iOS 10 in Swift 3. So here is what I came up with:

class ViewController: UIViewController {

    override var prefersStatusBarHidden: Bool {
        return true
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        UIView.animate(withDuration: 0.3, animations: {
            let bounds = self.navigationController!.navigationBar.bounds
            self.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: bounds.width, height: bounds.height + 20)
        })
    }
}