我正在绘制一个基本圆圈的动画。这很好用,除了动画开始在3点位置绘制。有谁知道我怎么能在12点开始呢?
self.circle = [CAShapeLayer layer];
self.circle.fillColor = nil;
self.circle.lineWidth = 7;
self.circle.strokeColor = [UIColor blackColor].CGColor;
self.circle.bounds = CGRectMake(0, 0, 200, 200);
self.circle.path = [UIBezierPath bezierPathWithOvalInRect:self.circle.bounds].CGPath;
[self.view.layer addSublayer:self.circle];
CABasicAnimation *drawAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
drawAnimation.duration = 5.0;
drawAnimation.repeatCount = 1.0;
drawAnimation.removedOnCompletion = NO;
drawAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
drawAnimation.toValue = [NSNumber numberWithFloat:1.0f];
drawAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
[self.circle addAnimation:drawAnimation forKey:@"drawCircleAnimation"];
答案 0 :(得分:14)
您可以使用bezierPathWithArcCenter
代替bezierPathWithOvalInRect
,因为这样可以指定开始和结束角度:
CGFloat radius = self.circle.bounds.size.width/2; // Assuming that width == height
self.circle.path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(radius, radius)
radius:radius
startAngle:(-M_PI/2)
endAngle:(3*M_PI/2)
clockwise:YES].CGPath;
有关角度的含义,请参阅bezierPathWithArcCenter文档。