在 UIImageView IOS 中加载动画 gif

Question

I have this gif into my assets file

The name of the assets is loading_apple but when I add the following code I get a nullpointer exception error:

let img = UIImage (named: "loading_apple")

So how can I show this gif ? :(

Hope someone can help me.

Answer 1

我建议使用 FLAnimatedImage https://github.com/Flipboard/FLAnimatedImage

Answer 2

I would recommend breaking out the frames of that gif and use animatedImageNamed:duration: - you can name them all the similar name with a number change at the end. For instance:

loading-1.png loading-2.png loading-3.png etc.

Xcode will recognize you want multiple images and will play those through in order.

Look at THIS

Answer 3

instead of storing the gif file, why don't u make use of CAReplicatorLayer refer this link and this link in objective c , i took same code in second like and with some modification,

func spinTheCustomSpinner() -> Void {
    let aBar:CALayer = CALayer.init()
    aBar.bounds = CGRectMake(0, 0, 8, 25);
    aBar.cornerRadius = 4; //(8/2)
    aBar.backgroundColor = UIColor.blackColor().CGColor
    aBar.position = CGPointMake(150.0, 150.0 + 35)

    let replicatorLayer:CAReplicatorLayer = CAReplicatorLayer.init()
    replicatorLayer.bounds = CGRectMake(0, 0,300,300)
    replicatorLayer.cornerRadius = 10.0
    replicatorLayer.backgroundColor = UIColor.whiteColor().CGColor
    replicatorLayer.position = CGPointMake(CGRectGetMidX(self.view!.bounds), CGRectGetMidY(self.view!.bounds))
    let angle:CGFloat = CGFloat (2.0 * M_PI) / 12.0
    let transform:CATransform3D = CATransform3DMakeRotation(angle, 0, 0, 1.0)
    replicatorLayer.instanceCount = 12
    replicatorLayer.instanceTransform = transform
    replicatorLayer .addSublayer(aBar)
    self.view!.layer .addSublayer(replicatorLayer)

    aBar.opacity = 0.0
    let animationFade:CABasicAnimation = CABasicAnimation(keyPath: "opacity")
    animationFade.fromValue = NSNumber(float: 1.0)
    animationFade.toValue = NSNumber(float: 0.0)
    animationFade.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
    animationFade.repeatCount = HUGE
    animationFade.duration = 1.0

    let aBarAnimationDuration:Double = 1.0/12.0
    replicatorLayer.instanceDelay = aBarAnimationDuration
    aBar .addAnimation(animationFade, forKey: "fadeAnimation")

}

if u use above with a view, show this view while loading and hide after loading, this is really cool and handy and there is no headache of storing the gif file and using a image view to load.

and by changing the properties of aBar layer u get different effects.

Answer 4

对于这个特定的 gif，您可能想要使用UIActivityIndicatorView并使用startAnimating()使其动画化