所以我试图用UIView做一个缩小/成长的圈子.我正在使用UIView.animateWithDuration …(blah blah blah)用于视图的框架,而CABasicAnimation用于为视图的(图层)角半径设置动画.两者都为正确的持续时间设置动画并以正确的圆形值(圆角半径= 1/2宽度)结束.问题是在动画期间,CABasicAnimation和UIView.animateWithDuration似乎有不同的动画曲线.如何实现正确的圆形动画.
如果答案是对农场膨胀使用CABAsicAnimation,请解释如何执行此操作.
谢谢!
码:
此代码是UIView的扩展.
//This is how it's being used to shrink the circle: circleview.growByPixles(-10,seconds: 0.3,completion: {}) circleview.setCornerRadius(radius:(circleview.bounds.size.width - 10) / 2 seconds: 0.3) ////// func morphToFrame(frame: CGRect,seconds: Double,completion: () -> ()) { UIView.animateWithDuration(seconds,animations: { self.frame = frame },completion: { _ in completion() }) } //negative integers shrink func growByPixels(pixels: CGFloat,completion: () -> ()) { var f:CGRect = self.frame var newFrame:CGRect = CGRect(x: f.origin.x - pixels/2,y: f.origin.y - pixels/2,width: f.size.width + pixels,height: f.size.height + pixels) self.morphToFrame(newFrame,seconds: seconds,completion: completion) } func setCornerRadius(radius: CGFloat,seconds: Double) { self.layer.masksToBounds = true var animation = CABasicAnimation(keyPath: "cornerRadius") animation.timingFunction = camediatimingFunction(name: kcamediatimingFunctionLinear) animation.fromValue = NSNumber(float: Float(self.layer.cornerRadius)) self.layer.cornerRadius = radius animation.duration = seconds self.layer.addAnimation(animation,forKey: "cornerRadius") }
解决方法
我像这样调整我的圈子视图:
- (void)resizeCircleView:(CGRect)frame { CGRect estimateFrame = frame; float duration = 1.0f; [UIView animateWithDuration:duration delay:0 options:UIViewAnimationoptionCurveLinear animations:^{ [circle setFrame:estimateFrame]; } completion:nil]; CGFloat estimateCorner = estimateFrame.size.width / 2; CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"cornerRadius"]; animation.timingFunction = [camediatimingFunction functionWithName:kcamediatimingFunctionLinear]; animation.fromValue = @(circle.layer.cornerRadius); animation.tovalue = @(estimateCorner); animation.duration = duration; [circle.layer setCornerRadius:estimateCorner]; [circle.layer addAnimation:animation forKey:@"cornerRadius"]; }