前言

最近在开发ios项目空闲之余，决定练习下UIBezierPath进行绘图和CAAnimation动画的使用，制作了一个心跳的动画,很简单的示例，下面话不多说了，来一起看看详细的介绍：

GIF示例:

核心代码

1-首先通过 drawRect 绘制心形view

- (void)drawRect:(CGRect)rect { // 间距 CGFloat padding = 4.0; // 半径(小圆半径) CGFloat curveRadius = (rect.size.width - 2 * padding)/4.0; // 贝塞尔曲线 UIBezierPath *heartPath = [UIBezierPath bezierPath]; // 起点(圆的第一个点) CGPoint tipLocation = CGPointMake(rect.size.width/2, rect.size.height-padding); // 从起点开始画 [heartPath moveToPoint:tipLocation]; // (左圆的第二个点) CGPoint topLeftCurveStart = CGPointMake(padding, rect.size.height/2.4); // 添加二次曲线 [heartPath addQuadCurveToPoint:topLeftCurveStart controlPoint:CGPointMake(topLeftCurveStart.x, topLeftCurveStart.y + curveRadius)]; // 画圆 [heartPath addArcWithCenter:CGPointMake(topLeftCurveStart.x+curveRadius, topLeftCurveStart.y) radius:curveRadius startAngle:M_PI endAngle:0 clockwise:YES]; // (左圆的第二个点) CGPoint topRightCurveStart = CGPointMake(topLeftCurveStart.x + 2*curveRadius, topLeftCurveStart.y); // 画圆 [heartPath addArcWithCenter:CGPointMake(topRightCurveStart.x+curveRadius, topRightCurveStart.y) radius:curveRadius startAngle:M_PI endAngle:0 clockwise:YES]; // 右上角控制点 CGPoint topRightCurveEnd = CGPointMake(topLeftCurveStart.x + 4*curveRadius, topRightCurveStart.y); // 添加二次曲线 [heartPath addQuadCurveToPoint:tipLocation controlPoint:CGPointMake(topRightCurveEnd.x, topRightCurveEnd.y+curveRadius)]; // 设置填充色 [[UIColor redColor] setFill]; // 填充 [heartPath fill]; // 设置边线 heartPath.lineWidth = 2; heartPath.lineCapStyle = kCGLineCapRound; heartPath.lineJoinStyle = kCGLineJoinRound; // 设置描边色 [[UIColor yellowColor] setStroke]; [heartPath stroke];}

2-添加心形view到主视图

XMHeartView *heartView = [[XMHeartView alloc] init]; heartView.frame = CGRectMake(100, 50, 200, 200); [self.view addSubview:heartView];

3-给心形view添加心跳动画

// 给心视图添加心跳动画 float bigSize = 1.1; CABasicAnimation *pulseAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"]; pulseAnimation.duration = 0.5; pulseAnimation.toValue = [NSNumber numberWithFloat:bigSize]; pulseAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; // 倒转动画 pulseAnimation.autoreverses = YES; // 设置重复次数为无限大 pulseAnimation.repeatCount = FLT_MAX; // 添加动画到layer [heartView.layer addAnimation:pulseAnimation forKey:@"transform.scale"];

总结

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