How to display UIView over keyboard in iOS

问题:

I want to create a simple view over keyboard, when users tap "Attach" button in inputAccessoryView. Something like this:

Is there an easy way to do it? Or i should create my custom keyboard?

回答1:

You can add that new subview to your application window.

func attach(sender : UIButton)
{
    // Calculate and replace the frame according to your keyboard frame
    var customView = UIView(frame: CGRect(x: 0, y: self.view.frame.size.height-300, width: self.view.frame.size.width, height: 300))
    customView.backgroundColor = UIColor.redColor()
    customView.layer.zPosition = CGFloat(MAXFLOAT)
    var windowCount = UIApplication.sharedApplication().windows.count
    UIApplication.sharedApplication().windows[windowCount-1].addSubview(customView);
}

回答2:

Swift 4.0

let customView = UIView(frame: CGRect(x: 0, y: self.view.frame.size.height-300, width: self.view.frame.size.width, height: 300))
customView.backgroundColor = UIColor.red
customView.layer.zPosition = CGFloat(MAXFLOAT)
let windowCount = UIApplication.shared.windows.count
UIApplication.shared.windows[windowCount-1].addSubview(customView)

回答3:

Do you have find some effective method to solve this problem? In iOS9,you put your customView on the top of the windows:

UIApplication.sharedApplication().windows[windowCount-1].addSubview(customView);

But if the keyboard dismisses, the top Windows will be removed, so your customView will be removed. Looking forward for your help! Thank you for your help!

回答4:

Swift 4 version:

let customView = UIView(frame: CGRect(x: 0, y: self.view.frame.size.height - 300, width: self.view.frame.size.width, height: 300))
customView.backgroundColor = UIColor.red
customView.layer.zPosition = CGFloat(Float.greatestFiniteMagnitude)
UIApplication.shared.windows.last?.addSubview(customView)

The trick is to add the customView as a top subview to the UIWindow that holds the keyboard - and it happens to be the last window in UIApplication.shared.windows.

回答5:

You can definitely add the view to your application’s window, and you can also add another window entirely. You can set its frame and level. The level could be UIWindowLevelAlert.

回答6:

While this can be possible with accessing the topmost window, I would avoid doing this, as it clearly interferes with Apple's guidelines.

What I would do is dismissing the keyboard and replacing its frame with a view with same dimensions.

The keyboard's frame can be accessed from keyboard notifications listed here, their userInfo contain a key that can be accessed with UIKeyboardFrameEndUserInfoKey.