- (void)drawRect:(CGRect)rect { // Drawing code // 初始化UIBezierPath UIBezierPath *path = [UIBezierPath bezierPath]; // 首先設置一個起始點 CGPoint startPoint = CGPointMake(rect.size.width/2, 120); // 以起始點為路徑的起點 [path moveToPoint:startPoint]; // 設置一個終點 CGPoint endPoint = CGPointMake(rect.size.width/2, rect.size.height-40); // 設置第一個控制點 CGPoint controlPoint1 = CGPointMake(100, 20); // 設置第二個控制點 CGPoint controlPoint2 = CGPointMake(0, 180); // 添加三次貝塞爾曲線 [path addCurveToPoint:endPoint controlPoint1:controlPoint1 controlPoint2:controlPoint2]; // 設置另一個起始點 [path moveToPoint:endPoint]; // 設置第三個控制點 CGPoint controlPoint3 = CGPointMake(rect.size.width-100, 20); // 設置第四個控制點 CGPoint controlPoint4 = CGPointMake(rect.size.width, 180); // 添加三次貝塞爾曲線 [path addCurveToPoint:startPoint controlPoint1:controlPoint4 controlPoint2:controlPoint3]; // 設置線寬 path.lineWidth = 3; // 設置線斷面類型 path.lineCapStyle = kCGLineCapRound; // 設置連接類型 path.lineJoinStyle = kCGLineJoinRound; // 設置畫筆顏色 [[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"]; // 設置動畫的路徑為心形路徑 animation.path = self.path.CGPath; // 動畫時間間隔 animation.duration = 3.0f; // 重復次數為最大值 animation.repeatCount = FLT_MAX; animation.removedOnCompletion = NO; animation.fillMode = kCAFillModeForwards; // 將動畫添加到動畫視圖上 [_demoView.layer addAnimation:animation forKey:nil];