UIView.animateWithDuration not animating

Question

The UIView.animateWithDuration call in my ViewController viewDidLoad function does not animate. The completion block gets called immediately. The println output shows 'completion true'. Is the viewDidLoad function the wrong place to put my startup animation? Any hints are greatly appreciated.

class ViewController: UIViewController {
    @IBOutlet var beatIndicator:UIView?

    override func viewDidLoad() {
        super.viewDidLoad()

        if let led = beatIndicator? {
            led.alpha = 1.0
            led.frame = CGRectMake(20, 20, 30, 30)
            led.layer.cornerRadius = 15

            UIView.animateWithDuration(3.0, animations:{
                led.alpha = 0.5
                led.frame = CGRectMake(25, 25, 20, 20)
                led.layer.cornerRadius = 10
            }, completion:{(value: Bool) in
                println("completion \(value)")
            })
        }

        // ...
    }
}

score 7 · Accepted Answer · edited Jul 08 '19 at 20:36

Have you tried putting it in ViewDidAppear?

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    if let led = beatIndicator {
        led.alpha = 1.0
        led.frame = CGRect(x: 20, y: 20, width: 30, height: 30)
        led.layer.cornerRadius = 15

        UIView.animate(withDuration: 3.0, animations:{
            led.alpha = 0.5
            led.frame = CGRect(x: 25, y: 25, width: 20, height: 20)
            led.layer.cornerRadius = 10
        }, completion:{(value: Bool) in
            print("completion \(value)")
        })
    }

    // ...
}

Just kicked myself around the office – Lee Probert Feb 18 '16 at 18:29 — Lee Probert, Feb 18 '16 at 18:29

score 3 · Answer 2 · answered Sep 30 '14 at 10:16

3

viewDidLoad() is not the ideal place where you should animate views. I tried your code in the viewDidAppear() method and it works.

answered Sep 30 '14 at 10:16

Isuru

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UIView.animateWithDuration not animating

2 Answers2

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