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复制辐射圆，例如 MKMapView 上的用户位置

发布于 2024-12-10 17:36:58 字数 69 浏览 0 评论 0原文

是否可以有像用户位置注释那样的放射状圆圈。这样自定义注释就有其他颜色的放射状圆圈。如果没有，是否有一种破解方法可以使其工作？

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美人迟暮 2024-12-17 17:36:58

看看这个。您也许可以用它来做您需要做的事情。结合使用核心动画和子类化 MKCircleView 或 MKOverlayView。

http://yickhong-ios.blogspot.com/2012 /04/animated-circle-on-mkmapview.html

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爱已欠费 2024-12-17 17:36:58

可以创建 UIView 的自定义子类来执行此操作。具有两个子层的 UIView，一个用于中心球，一个用于扩展环。环形层和球层可以通过子类化 CALayer 并重写drawInContext:来创建，这样你就可以获得你想要的任何颜色。为环设置动画以便它们同时展开和淡出的代码可以使用如下所示的 CAAnimationGroup：

// expand the ring from the ball size to the ring's max size
CABasicAnimation *sizeAnim = [CABasicAnimation animationWithKeyPath:@"bounds"];
sizeAnim.fromValue   = [NSValue valueWithCGRect:ballBounds];
sizeAnim.toValue     = [NSValue valueWithCGRect:ringBoundsMax];
sizeAnim.duration    = kRingExpansionTime;

// fade out the ring part way thru the animation
CABasicAnimation* alphaAnim = [CABasicAnimation animationWithKeyPath:@"opacity"];
alphaAnim.fromValue   = [NSNumber numberWithFloat:1];
alphaAnim.toValue     = [NSNumber numberWithFloat:0];
alphaAnim.beginTime   = kRingExpansionTime * 0.7f;      // start part way thru
alphaAnim.duration    = kRingExpansionTime - alphaAnim.beginTime;

CAAnimationGroup* group = [CAAnimationGroup animation];
group.duration    = kRingExpansionTime;
group.repeatCount = HUGE_VALF;      // repeat forever
group.animations  = [NSArray arrayWithObjects:sizeAnim, alphaAnim, nil];
[ringLayer addAnimation:group forKey:nil];

It is possible to create a custom subclass of UIView that does this. A UIView with two sublayers, one for the center ball and one for the expanding rings. The ring layer and the ball layer can be created by subclassing CALayer and overriding drawInContext: so you can get any colors you want. Code to animate the rings so that they expand and fade out at the same time could use a CAAnimationGroup like this:

// expand the ring from the ball size to the ring's max size
CABasicAnimation *sizeAnim = [CABasicAnimation animationWithKeyPath:@"bounds"];
sizeAnim.fromValue   = [NSValue valueWithCGRect:ballBounds];
sizeAnim.toValue     = [NSValue valueWithCGRect:ringBoundsMax];
sizeAnim.duration    = kRingExpansionTime;

// fade out the ring part way thru the animation
CABasicAnimation* alphaAnim = [CABasicAnimation animationWithKeyPath:@"opacity"];
alphaAnim.fromValue   = [NSNumber numberWithFloat:1];
alphaAnim.toValue     = [NSNumber numberWithFloat:0];
alphaAnim.beginTime   = kRingExpansionTime * 0.7f;      // start part way thru
alphaAnim.duration    = kRingExpansionTime - alphaAnim.beginTime;

CAAnimationGroup* group = [CAAnimationGroup animation];
group.duration    = kRingExpansionTime;
group.repeatCount = HUGE_VALF;      // repeat forever
group.animations  = [NSArray arrayWithObjects:sizeAnim, alphaAnim, nil];
[ringLayer addAnimation:group forKey:nil];

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