Setting UIProgressView progress to 0

Question

I have a UIProgressView which runs for 2.5 seconds however sometimes, like if the app is being resumed from multitasking, the loading bar will start halfway up. How would I reset the UIProgressView to 0.0 each time it is opened? I could set to 0 in the viewDidLoad and then start the timer and animate it in the viewDidAppear. I just need to know how I can set my progressView to 0.

Can you give an example of which actions would update the UIProgressView? Also i'd recommend setting it on the `viewWillAppear:` — Erakk, Jul 16 '15 at 15:44

Erakk · Accepted Answer · 2015-07-16T16:01:17.293

1

You set it on the viewWillAppear, thats what it calls when the view will be displayed whether when you push it into the hierarchy ro when you resume from the background.

override func viewWillAppear() {
    super viewWillAppear();
    self.progressView.progress = 0.f;
}

You can also use the UIApplicationDidBecomeActiveNotification.

//inside init
NSNotificationCenter.defaultCenter().addObserver(self, selector: "updateProgressBar", name: UIDeviceBatteryLevelDidChangeNotification, object: nil);

//on dealloc
NSNotificationCenter.defaultCenter().removeObserver(self);


//the update method
func updateProgressBar() {
    self.progressBar.progress = 0.f;
}

edited Jul 16 '15 at 16:01

answered Jul 16 '15 at 15:53

Erakk

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Didn't saw the `Swift` in the title, updated the language. – Erakk Jul 16 '15 at 16:04
Ok thanks - will give it a go and let you know how it goes :) – dwinnbrown Jul 16 '15 at 17:01
1

all I did was use the code: `self.progressView.progress = 0.0;` as the bar itself is animated in a function outside the `viewDidLoad` – dwinnbrown Jul 16 '15 at 17:06

Setting UIProgressView progress to 0

1 Answers1