动画黄金搭档:CADisplayLink & CAShapeLayer

CADisplayLink

CADisplayLink *dl = [CADisplayLink displayLinkWithTarget:self selector:@selector(updateWave:)];
[dl addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];

CAShapeLayer

_waveSinLayer = [CAShapeLayer layer];
_waveSinLayer.strokeColor = [UIColor greenColor].CGColor;//边缘线的颜色
_waveSinLayer.fillColor = [UIColor greenColor].CGColor;// 闭环填充的颜色
_waveSinLayer.lineWidth = 5;
_waveSinLayer.lineJoin = kCALineJoinRound;//链接线类型
_waveSinLayer.lineCap = kCALineCapRound;//边缘性类型
_waveSinLayer.frame = CGRectMake(0, self.bounds.size.height, self.bounds.size.width, self.bounds.size.height);
[self.layer addSublayer:_waveSinLayer];

CABasicAnimation

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
animation.fromValue = [NSValue valueWithCGPoint:_waveSinLayer.position];//所改变属性的起始值
animation.toValue = [NSValue valueWithCGPoint:position];//所改变属性的结束时的值
animation.duration = 5;//动画的时长
animation.repeatCount = HUGE_VALF;//重复的次数。不停重复设置为 HUGE_VALF
animation.removedOnCompletion = NO;
[_waveCosLayer addAnimation:animation forKey:@"sss"];