斯威夫特在使用一个动画块在动画CAShapeLayer strokeEnd [英] animating strokeEnd in a CAShapeLayer using an animation block in Swift

问题描述

我试图描绘出我已经到位成CAShapeLayer路径的形状。在此功能中，点阵列中的点重新present正多边形的顶点。动画没有发生，虽然。它只是出现，完全动画。

I am attempting to trace out the shape of a path that I've place into a CAShapeLayer. In this function, the points in the points array represent the vertices of a regular polygon. The animation isn't happening, though. It's just appearing, totally animated.

下面是code：

private func drawShape (point: [(x: Double, y:Double)]) {

    let shapeLayer = CAShapeLayer()

    let shapePath = UIBezierPath()
    shapePath.moveToPoint(CGPoint(x:point[point.count-1].x, y:point[point.count-1].y))

    for i in point {
        shapePath.addLineToPoint(CGPoint(x:i.x, y:i.y))
    }

    shapeLayer.path = shapePath.CGPath

    drawingSurface.layer.addSublayer(shapeLayer)

    shapeLayer.fillColor = UIColor.clearColor().CGColor
    shapeLayer.strokeColor = UIColor.blackColor().CGColor
    shapeLayer.strokeEnd = 0

    UIView.animateWithDuration(30, delay: 0, options: .CurveEaseInOut, animations: {
        shapeLayer.strokeEnd = 1
        }, completion: {finished in println("This Finished")
    })
}

我想到的是，它会笼络我已经设置（30秒的时刻）的时间行程，但相反，它只是似乎，没有动画绘制完全

What I expect is that it will draw the stroke over the duration that I have set (30 seconds at the moment), but instead, it just appears, fully drawn with no animation.

有什么想法？

推荐答案

我相信你已经找到了答案，但是从我的理解是，animateWithDuration方法只能大概动画8种不同的属性和EndAngle不是一天他们。只有CAAnimations可以做到这一点。 animateWithDuration和CAAnimations是专门为不同的事情。

I'm sure you already found the answer but from what I understand is that the animateWithDuration method can only animate about 8 different properties and the EndAngle is not one of them. Only CAAnimations can do this. animateWithDuration and CAAnimations are built for different things.

从IOS文件引用：

UIView类的以下属性动画：

The following properties of the UIView class are animatable:

@property帧

@property frame

@property边界

@property bounds

@property中心

@property center

@property变换

@property transform

@property阿尔法

@property alpha

@property的backgroundColor

@property backgroundColor

@property contentStretch

@property contentStretch

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