我使用下面的代码用CAShapeLayer绘制一个Pie切片层。
CGFloat endAngle = (M_PI*2/5)-M_PI_2;
CAShapeLayer *outerBorderCircle = [CAShapeLayer layer];
int outerradius = self.frame.size.width/2;
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(outerradius, outerradius)];
[path addLineToPoint:CGPointMake(outerradius, self.outerCircleBorder)];
[path addArcWithCenter:CGPointMake(outerradius,outerradius) radius:outerradius-self.outerCircleBorder startAngle:-M_PI_2 endAngle:endAngle clockwise:YES];
[path closePath];
outerBorderCircle.path = path.CGPath;
outerBorderCircle.fillColor = [UIColor whiteColor].CGColor;
outerBorderCircle.strokeColor = self.borderShadowColor.CGColor;
outerBorderCircle.lineWidth = self.outerCircleBorder;
outerBorderCircle.lineJoin = kCALineJoinRound;
outerBorderCircle.zPosition = MAXFLOAT;
CABasicAnimation *startanimation = [CABasicAnimation animationWithKeyPath:@"fillColor"];
startanimation.removedOnCompletion = YES;
startanimation.fromValue = (id)[[UIColor clearColor] CGColor];
startanimation.toValue = (id)[[UIColor whiteColor] CGColor];
startanimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
startanimation.duration = 10.0;
[startanimation setFillMode:kCAFillModeBoth];
[outerBorderCircle addAnimation:startanimation forKey:@"fillColor"];
[self.layer addSublayer:outerBorderCircle];
但动画部分淡出淡出。但我需要动画弧形动画。
请帮帮我。
答案 0 :(得分：0)
要为笔画设置动画，您应该为这些属性设置动画：
-strokeStart
-strokeEnd
来自文档：
结合strokeEnd属性，此属性定义了 中风路径的次区域。此属性中的值表示 沿着路径开始抚摸的相对点 strokeEnd属性定义终点。值0.0表示 路径的开头，而值1.0表示结束 路径。中间的值沿路径线性解释 长度。
<强> [UPDATE]
CABasicAnimation *drawAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
drawAnimation.duration = timeInSeconds;
drawAnimation.fromValue = [NSNumber numberWithFloat:startAngle];
drawAnimation.toValue = [NSNumber numberWithFloat:endAngle];
drawAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[circle addAnimation:drawAnimation forKey:@"drawCircleAnimation"];