关键帧动画：iOS核心动画中的CAKeyframeAnimation详解

以下是根据您提供的内容重构的代码：

```objective-c

// 触摸事件处理

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

// 获取当前触摸点

CGPoint location = [[touches anyObject] locationInView:self.view];

// 判断当前触摸点的数量

if (self.points.count < MAX_CLICKED_NUM) {

// 添加当前触摸点到数组中

[self.points addObject:[NSValue valueWithCGPoint:location]];

// 如果触摸点数量小于最大值，则直接执行动画

CAKeyframeAnimation *keyanimation = [[CAKeyframeAnimation alloc] init];

keyanimation.keyPath = @"position";

keyanimation.values = self.points;

keyanimation.duration = 3.0f;

keyanimation.removedOnCompletion = NO;

keyanimation.fillMode = kCAFillModeForwards;

keyanimation.delegate = self;

[self.subLayer addAnimation:keyanimation forKey:@"keyanimation"];

} else {

// 如果触摸点数量大于等于最大值，则创建关键帧动画并执行

CAKeyframeAnimation *keyanimation = [[CAKeyframeAnimation alloc] init];

keyanimation.keyPath = @"position";

keyanimation.values = @[@[NSValue valueWithCGPoint:location], [NSValue valueWithCGPoint:self.points[MIN(self.points.count, MAX_CLICKED_NUM)]]];

keyanimation.duration = 3.0f;

keyanimation.removedOnCompletion = NO;

keyanimation.fillMode = kCAFillModeForwards;

keyanimation.delegate = self;

[self.subLayer addAnimation:keyanimation forKey:@"keyanimation"];

}

}

```