一次加载一个 UICollectionViewCell [英] Loading UICollectionViewCell one at a time

问题描述

根据这篇文章 http://aplus.rs/2014/how-to-animate-in-uicollectionview-items/ 我试图一次加载一个 UICollectionViewCell 以在单元格出现时为其设置动画.但是，当我调用循环 cellCount++ 的代码时，它会产生此错误:

<块引用>

由于未捕获的异常而终止应用'NSInternalInconsistencyException'，原因:'无效更新:无效第 0 部分中的项目数.更新后的现有部分 (1) 必须等于更新前包含在该部分中的项目 (1)，加上或减去从该部分插入或删除的项目数(插入 1 个，0 已删除)并加上或减去移入或移出的项目数该部分(0 移入，0 移出).'

我终其一生都无法弄清楚.

这是我的代码:

-(void)addCells{for (self.cellCount=0; self.cellCount<50; self.cellCount++) {[self.collectionView performBatchUpdates:^{[self.collectionView insertItemsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath indexPathForItem:self.cellCount inSection:0]]];} 完成:无];}}

解决方案

您可以使用计时器来执行此操作，计时器的操作方法将对象从数据源数组添加到用于填充集合视图的可变数组.

>

-(void)viewDidLoad {[超级viewDidLoad];self.mutableArray = [NSMutableArray new];self.data = @[@"one", @"one", @"one", @"one", @"one", @"one"];[NSTimer scheduleTimerWithTimeInterval:.1 target:self selector:@selector(addCells:) userInfo:nil repeats:YES];}-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {返回 self.mutableArray.count;}-(void)addCells:(NSTimer *) timer {静态整数计数器 = 0;[self.mutableArray addObject:self.data[counter]];计数器++；[self.collectionview insertItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:self.mutableArray.count -1 inSection:0]]];if (self.mutableArray.count == self.data.count) {[定时器失效];}}

As per this article http://aplus.rs/2014/how-to-animate-in-uicollectionview-items/ I am trying to load a UICollectionViewCell one at a time to animate the cell when it appears. However, when I call the code the loops the cellCount++, it produces this error:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of items in section 0. The number of items contained in an existing section after the update (1) must be equal to the number of items contained in that section before the update (1), plus or minus the number of items inserted or deleted from that section (1 inserted, 0 deleted) and plus or minus the number of items moved into or out of that section (0 moved in, 0 moved out).'

And I cannot for the life of me figure it out.

Here is my code:

-(void)addCells{

    for (self.cellCount=0; self.cellCount<50; self.cellCount++) {

        [self.collectionView performBatchUpdates:^{
            [self.collectionView insertItemsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath indexPathForItem:self.cellCount inSection:0]]];
        } completion:nil];

    }

}

解决方案

You can do this using a timer, whose action method adds objects from your data source array to a mutable array that you use to populate your collection view.

-(void)viewDidLoad {
    [super viewDidLoad];
    self.mutableArray = [NSMutableArray new];
    self.data = @[@"one", @"one", @"one", @"one", @"one", @"one"];
    [NSTimer scheduledTimerWithTimeInterval:.1 target:self selector:@selector(addCells:) userInfo:nil repeats:YES];
}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.mutableArray.count;
}


-(void)addCells:(NSTimer *) timer {
    static int counter = 0;
    [self.mutableArray addObject:self.data[counter]];
    counter ++;
    [self.collectionview insertItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:self.mutableArray.count -1 inSection:0]]];
    if (self.mutableArray.count == self.data.count) {
        [timer invalidate];
    }
}

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