我正在努力缩放圆并保持相同的中心位置,这看起来像 map 上的脉动圆。
AnimationView.m
@property (nonatomic, strong) UIBezierPath *ovalPath;
- (void)drawCircle
{
UIGraphicsBeginImageContext(self.frame.size);
CGRect rect = CGRectMake(25.45, 49.25, 5.8, 5.8);
self.ovalPath = [UIBezierPath bezierPathWithOvalInRect: rect];
[self.ovalPath fill];
UIGraphicsEndImageContext();
}
- (void)bumpUpCircle
{
CAShapeLayer *pathLayer = [CAShapeLayer layer];
pathLayer.frame = self.bounds;
pathLayer.path = self.ovalPath.CGPath;
pathLayer.fillColor = [UIColor blackColor].CGColor;
pathLayer.lineWidth = 2.0f;
pathLayer.lineJoin = kCALineJoinBevel;
[self.layer addSublayer:pathLayer];
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath"transform.scale"];
animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.0, 0.0, 0)];
animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(10.0, 10.0, 10.0)];
animation.repeatCount = 1;
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
animation.duration = 1;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
[pathLayer addAnimation:animation forKey"transform.scale"];
NSLog(@"%@",NSStringFromCGPoint(self.bounds.origin));
}
但是,缩放位置在一个奇怪的位置,而不是圆的中心。
任何想法将不胜感激。谢谢。
编辑:
我对你的脉冲圈建议是使用 UIView
并将其作为 subview 添加到你的 UIViewController
中。在下面的示例中,您会得到一个脉冲圆(一个 UIView
与一个 cornerRadius
类似半径)在几行中向上和向下缩放。包括这个,例如在你的 UIViewController
的 viewDidLoad
中尝试一下。
int radius = 100;
UIView * circleView = [[UIView alloc] init];
circleView.backgroundColor = [UIColor greenColor];
circleView.frame = CGRectMake(0, 0, radius*2, radius*2);
circleView.center = self.view.center;
circleView.layer.cornerRadius = radius;
[self.view addSubview:circleView];
[UIView animateWithDuration:0.8f
delay:0.0f
options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat
animations:^{
circleView.transform = CGAffineTransformMakeScale(1.1, 1.1);
} completion:^(BOOL fin) {
// Do nothing
}];
关于ios - 在同一中心位置缩放一个圆圈,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31487293/
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