iOS中利用UIBezierPath + CAAnimation实现心跳动画效果
时间：2020-11-01 14:33:08 | 栏目：iOS代码 | 点击：次
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