Question

我想通过下面的代码为我的循环progressView创建一个动画。我希望动画开始从0到我想要的值的进度。但我永远无法让动画工作。

migration.deleteData(CustomObject.className()) // If needed

migration.enumerate(User.className()) { oldObject, newObject in
    if let oldObject = oldObject,
        let newObject = newObject {
            let oldCustomObject = oldObject["customObject"] as! MigrationObject
            let newCustomObject = migration.create(CustomObject.className(), value: oldCustomObject)

            let customObjectList = newObject["customObjectList"] as! List<MigrationObject>
            customObjectList.append(newCustomObject)
    }
}

Answer 1

使用CABasicAnimation

    let circle = Pop

    var progressCircle = CAShapeLayer()

    let circlePath = UIBezierPath(ovalInRect: circle.bounds)

    progressCircle = CAShapeLayer ()
    progressCircle.path = circlePath.CGPath
    progressCircle.strokeColor = UIColor.greenColor().CGColor
    progressCircle.fillColor = UIColor.clearColor().CGColor
    progressCircle.lineWidth = 5.0

    circle.layer.addSublayer(progressCircle)


    let animation = CABasicAnimation(keyPath: "strokeEnd")
    animation.fromValue = 0
    animation.toValue = 0.2
    animation.duration = 3
    animation.fillMode = kCAFillModeForwards
    animation.removedOnCompletion = false

    progressCircle.addAnimation(animation, forKey: "ani")

Answer 2

两件事 -

首先 - 不要重新初始化progressCircle。您正在拨打progressCircle = CAShapeLayer ();两次。这不是错误。

秒 - 在开始设置动画之前添加子图层。将circle.layer.addSublayer(progressCircle);移到动画块之外。

在Swift中动画循环进度视图

2 个答案: