Ios 在从UICollectionView中删除单元格之前，将在项目之后删除动画

我已经构建了一个集合视图控制器，它可以通过

NSFetchResultsController

进行更新

当控制器设置为编辑时，我在集合视图中摆动项目单元格，以突出显示用户处于不同的模式，因此当他们点击项目时，应该预期删除行为

问题是当我开始编辑并删除一个项目时，删除的单元格后的所有其他项目都会停止动画

如果你看上面的gif，你会看到我开始编辑，所有的项目都在抖动。当我删除第3项时，该项（4、5、6等）下方的所有项停止抖动，而其上方的所有单元格（0、1）保持抖动。我的猜测是，问题在于苹果公司实施了删除动画，删除了所有动画，但我希望不会

---

可以在SQKFetchedCollectionViewController功能分支中找到所有源。克隆repo后，必须从项目文件夹运行pod安装。打开工作区，您可以在示例目标中找到

sqkcommitscolectionviewcontroller

，然后找到在Pods目标中作为开发pod提供数据的代码

多亏了@ian macdonald，我调查了使用

CAAnimation

而不是

[UIView animateWith

选项

旧方法

使用集合视图的删除动画的新填充方法

- (void)startWiggleing
{
    CAKeyframeAnimation *position = [CAKeyframeAnimation animation];
    position.keyPath = @"position";
    position.values = @[
                        [NSValue valueWithCGPoint:CGPointZero],
                        [NSValue valueWithCGPoint:CGPointMake(-1, 0)],
                        [NSValue valueWithCGPoint:CGPointMake(1, 0)],
                        [NSValue valueWithCGPoint:CGPointMake(-1, 1)],
                        [NSValue valueWithCGPoint:CGPointMake(1, -1)],
                        [NSValue valueWithCGPoint:CGPointZero]
                        ];
    position.timingFunctions = @[
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]
                                 ];
    position.additive = YES;

    CAKeyframeAnimation *rotation = [CAKeyframeAnimation animation];
    rotation.keyPath = @"transform.rotation";
    rotation.values = @[
                        @0,
                        @0.03,
                        @0,
                        [NSNumber numberWithFloat:-0.02]
                        ];
    rotation.timingFunctions = @[
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]
                                 ];

    CAAnimationGroup *group = [[CAAnimationGroup alloc] init];
    group.animations = @[position, rotation];
    group.duration = 0.4;
    group.repeatCount = HUGE_VALF;

    [self.layer addAnimation:group forKey:@"wiggle"];
}

---

要通读的代码太多了，所以我不打算这么做。不过，我会提供一些建议。您应该研究创建自己的动画关键点，并在其处于活动状态时晃动项目。这样，集合视图将单元格移动到新位置所施加的动画不会取消您的动画。

- (void)startWiggleing
{
    CAKeyframeAnimation *position = [CAKeyframeAnimation animation];
    position.keyPath = @"position";
    position.values = @[
                        [NSValue valueWithCGPoint:CGPointZero],
                        [NSValue valueWithCGPoint:CGPointMake(-1, 0)],
                        [NSValue valueWithCGPoint:CGPointMake(1, 0)],
                        [NSValue valueWithCGPoint:CGPointMake(-1, 1)],
                        [NSValue valueWithCGPoint:CGPointMake(1, -1)],
                        [NSValue valueWithCGPoint:CGPointZero]
                        ];
    position.timingFunctions = @[
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]
                                 ];
    position.additive = YES;

    CAKeyframeAnimation *rotation = [CAKeyframeAnimation animation];
    rotation.keyPath = @"transform.rotation";
    rotation.values = @[
                        @0,
                        @0.03,
                        @0,
                        [NSNumber numberWithFloat:-0.02]
                        ];
    rotation.timingFunctions = @[
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]
                                 ];

    CAAnimationGroup *group = [[CAAnimationGroup alloc] init];
    group.animations = @[position, rotation];
    group.duration = 0.4;
    group.repeatCount = HUGE_VALF;

    [self.layer addAnimation:group forKey:@"wiggle"];
}