動畫不起作用？

我想旋轉一個ImageView和哪個工作，但是當我從另一個屏幕上加載該屏幕動畫不起作用。動畫不起作用？

class LoadingRequestViewController: UIViewController ,UICollectionViewDelegate,GMSMapViewDelegate, CLLocationManagerDelegate { 
//UI OutletControls 
@IBOutlet weak var loadingImg: UIImageView! 
@IBOutlet var mapView: GMSMapView! 
@IBOutlet weak var containerView: UIView! 
//UI OutletControls 


override func viewDidLoad() { 
    super.viewDidLoad() 

    loadingImg.startRotating() 

} 



func TimerStoppedTrue() { 
    TimerStopped = true 
    NSLog("TimerStopped\(TimerStopped)") 
} 

@IBAction func CancelHireAction(sender: AnyObject) { 
    self.timer.invalidate() 
    self.CancelHire(self.HireID) 
}

}

extension UIView { 
func startRotating(duration: Double = 1) { 
    let kAnimationKey = "rotation" 

    if self.layer.animationForKey(kAnimationKey) == nil { 
     let animate = CABasicAnimation(keyPath: "transform.rotation") 
     animate.duration = duration 
     animate.repeatCount = Float.infinity 
     animate.fromValue = 0.0 
     animate.toValue = Float(M_PI * 2.0) 
     self.layer.addAnimation(animate, forKey: kAnimationKey) 
    } 


} 
func stopRotating() { 
    let kAnimationKey = "rotation" 

    if self.layer.animationForKey(kAnimationKey) != nil { 
     self.layer.removeAnimationForKey(kAnimationKey) 
    } 
}

}

當我打電話LoadingRequestViewController像下面的動畫不work.But單獨它的工作。

let storyboard = UIStoryboard(name: "Main", bundle: nil) 
    let vc = storyboard.instantiateViewControllerWithIdentifier("LoadingSTBID") as! LoadingRequestViewController 

    self.presentViewController(vc, animated: true, completion: nil)

來源

2017-02-24 Anushka Madushan

嘗試添加它在viewwillAppear。它應該工作得很好！

來源

2017-02-24 06:17:19

動畫不起作用？

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