我之前已经看过这个问题,但尚未找到答案。我已经有一段时间了,需要知道如何设置LINE的动画而不是矩形。
从我可以看到,动画从笔画到盒子是非常不同的。这里只需要一些指示 -
我有一个在视图加载上绘制的边框(不是动画,它只是绘制它):
override public func drawRect(rect: CGRect){
super.drawRect(rect)
let borderColor = self.hasError! ? kDefaultActiveColor : kDefaultErrorColor
let textRect = self.textRectForBounds(rect)
let context = UIGraphicsGetCurrentContext()
let borderlines : [CGPoint] = [CGPointMake(0, CGRectGetHeight(textRect) - 1),
CGPointMake(CGRectGetWidth(textRect), CGRectGetHeight(textRect) - 1)]
if self.enabled {
CGContextBeginPath(context);
CGContextAddLines(context, borderlines, 2);
CGContextSetLineWidth(context, 1.3);
CGContextSetStrokeColorWithColor(context, borderColor.CGColor);
CGContextStrokePath(context);
我从另一个答案得到了这个,并试图把它分开。当视图加载时,我需要从中心动画/生长出来的线条,就像增长到与此处绘制的相同的宽度和大小但是动画。
我不知道如何做到这一点,但是另一个答案通过在这里将边框设置为零来实现我需要的效果:
self.activeBorder = UIView(frame: CGRectZero)
self.activeBorder.backgroundColor = kDefaultActiveColor
//self.activeBorder.backgroundColor = kDefaultActiveBorderColor
self.activeBorder.layer.opacity = 0
self.addSubview(self.activeBorder)
使用动画制作:
self.borderlines.transform = CATransform3DMakeScale(CGFloat(0.01), CGFloat(1.0), 1)
self.activeBorder.layer.opacity = 1
CATransaction.begin()
self.activeBorder.layer.transform = CATransform3DMakeScale(CGFloat(0.03), CGFloat(1.0), 1)
let anim2 = CABasicAnimation(keyPath: "transform")
let fromTransform = CATransform3DMakeScale(CGFloat(0.01), CGFloat(1.0), 1)
let toTransform = CATransform3DMakeScale(CGFloat(1.0), CGFloat(1.0), 1)
anim2.fromValue = NSValue(CATransform3D: fromTransform)
anim2.toValue = NSValue(CATransform3D: toTransform)
anim2.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)
anim2.fillMode = kCAFillModeForwards
anim2.removedOnCompletion = false
self.activeBorder.layer.addAnimation(anim2, forKey: "_activeBorder")
CATransaction.commit()
这似乎使用了与我原来的drawRect
完全不同的代码,我不知道如何将两者结合起来。我在哪里错了?当我做第二个活动边界时,我如何从中心抽出我的第一个边界?
答案 0 :(得分:0)
使用CAShapeLater
,UIBezierPath
和CABasicAnimation
动画绘制线条。
以下是示例代码:
class SampleView: UIView {
override public func drawRect(rect: CGRect) {
let leftPath = UIBezierPath()
leftPath.moveToPoint(CGPointMake(CGRectGetMidX(frame), CGRectGetHeight(frame)))
leftPath.addLineToPoint(CGPointMake(0, CGRectGetHeight(frame)))
let rightPath = UIBezierPath()
rightPath.moveToPoint(CGPointMake(CGRectGetMidX(frame), CGRectGetHeight(frame)))
rightPath.addLineToPoint(CGPointMake(CGRectGetWidth(frame), CGRectGetHeight(frame)))
let leftShapeLayer = CAShapeLayer()
leftShapeLayer.path = leftPath.CGPath
leftShapeLayer.strokeColor = UIColor.redColor().CGColor;
leftShapeLayer.lineWidth = 1.3
leftShapeLayer.strokeEnd = 0
layer.addSublayer(leftShapeLayer)
let rightShpaeLayer = CAShapeLayer()
rightShpaeLayer.path = rightPath.CGPath
rightShpaeLayer.strokeColor = UIColor.redColor().CGColor;
rightShpaeLayer.lineWidth = 1.3
rightShpaeLayer.strokeEnd = 0
layer.addSublayer(rightShpaeLayer)
let drawLineAnimation = CABasicAnimation(keyPath: "strokeEnd")
drawLineAnimation.toValue = NSNumber(float: 1)
drawLineAnimation.duration = 1
drawLineAnimation.fillMode = kCAFillModeForwards
drawLineAnimation.removedOnCompletion = false
leftShapeLayer.addAnimation(drawLineAnimation, forKey: nil)
rightShpaeLayer.addAnimation(drawLineAnimation, forKey: nil)
}
}
viewDidLoad
ViewController
中的代码
// ...
let sampleView = SampleView()
sampleView.frame = CGRectMake(10, 60, 240, 50)
sampleView.backgroundColor = UIColor.lightGrayColor()
view.addSubview(sampleView)
以下是捕获:
注意:如果你在iOS9模拟器中运行代码(我没有测试过早期版本),动画可能会被阻止。选择在真实设备或iOS10模拟器中运行它。