iOS利用UIBezierPath + CAAnimation实现路径动画效果

- (void)drawRect:(CGRect)rect { // Drawing code // 初始化UIBezierPath UIBezierPath *path = [UIBezierPath bezierPath]; // 首先设置一个起始点 CGPoint startPoint = CGPointMake(rect.size.width/2, 120); // 以起始点为路径的起点 [path moveToPoint:startPoint]; // 设置一个终点 CGPoint endPoint = CGPointMake(rect.size.width/2, rect.size.height-40); // 设置第一个控制点 CGPoint controlPoint1 = CGPointMake(100, 20); // 设置第二个控制点 CGPoint controlPoint2 = CGPointMake(0, 180); // 添加三次贝塞尔曲线 [path addCurveToPoint:endPoint controlPoint1:controlPoint1 controlPoint2:controlPoint2]; // 设置另一个起始点 [path moveToPoint:endPoint]; // 设置第三个控制点 CGPoint controlPoint3 = CGPointMake(rect.size.width-100, 20); // 设置第四个控制点 CGPoint controlPoint4 = CGPointMake(rect.size.width, 180); // 添加三次贝塞尔曲线 [path addCurveToPoint:startPoint controlPoint1:controlPoint4 controlPoint2:controlPoint3]; // 设置线宽 path.lineWidth = 3; // 设置线断面类型 path.lineCapStyle = kCGLineCapRound; // 设置连接类型 path.lineJoinStyle = kCGLineJoinRound; // 设置画笔颜色 [[UIColor redColor] set]; [path stroke];}

 HeartView *heart = [[HeartView alloc] init]; heart.frame = CGRectMake(0, 0, Screen_Width, Screen_Height-Screen_Height); [self.view addSubview:heart];

 CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"]; // 设置动画的路径为心形路径 animation.path = self.path.CGPath; // 动画时间间隔 animation.duration = 3.0f; // 重复次数为最大值 animation.repeatCount = FLT_MAX; animation.removedOnCompletion = NO; animation.fillMode = kCAFillModeForwards; // 将动画添加到动画视图上 [_demoView.layer addAnimation:animation forKey:nil];