Use of MBProgressHUD Globally + make it singleton

Question

In my Project, each of the user interaction events make a network call (Which is TCP, not HTTP). I need Activity Indicator to be global to show from a rando

Answer 1

I was using the code from @Michael Shang and having all kinds of inconsistent behavior with showing HUDs. Turns out using the last window is unreliable as the iOS keyboard may just hide it. So in the majority of cases you should get the window using the AppDelegate as mentioned by @David Lawson.

Here's how in Swift:

let window = UIApplication.sharedApplication().delegate!.window!!
let hud = MBProgressHUD.showHUDAddedTo(window, animated: true)

However, with the above your HUD will show up behind the iOS keyboard (if they overlap). If you need your HUD to overlay the keyboard use the last window method.

In my case, what was happening is I would show the HUD then call resignFirstResponder() immediately hiding the window the HUD was added to. So this is something to be aware of, the only window guaranteed to stick around is the first one.

I ended up creating a method that could optionally add the HUD above the keyboard if needed:

func createHUD(size: CGSize, overKeyboard: Bool = false) -> MBProgressHUD {
    let window = overKeyboard ? UIApplication.sharedApplication().windows.last!
                              : UIApplication.sharedApplication().delegate!.window!!
    let hud = MBProgressHUD.showHUDAddedTo(window, animated: true)
    hud.minSize = size
    hud.bezelView.style = .SolidColor
    hud.bezelView.color = UIColor(white: 0, alpha: 0.8)
    return hud
}