我正在尝试更改UICollectionViewCell按钮单击上的数据（在iPad中）？如何实现呢？如何发送不同的array count，以numberOfItemsInSection按钮点击？
在我的viewDidLoad：
self.collectionViewImages=[[NSMutableArray alloc]initWithObjects:@"1.jpg",@"2.jpg",@"3.jpg",nil] ;
然后在CollectionViewMethods：
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView
numberOfItemsInSection:(NSInteger)section
{
return [_collectionViewImages count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *myCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell"
forIndexPath:indexPath];
NSString *collectionViewImageName=[self.collectionViewImages objectAtIndex:indexPath.row];
UIImageView * collectionImage = (UIImageView*)[myCell viewWithTag:11];
collectionImage.image =[UIImage imageNamed:collectionViewImageName];
return myCell;
}
然后在ButtonClick上-（因为有4-5个按钮，我正在收集每个按钮的标签NSInteger并numberOfItemsInSection像这样使用该属性，
-(void)btnTapped:(id)sender{
int tag= [(UIButton *)sender tag];
NSLog(@"Button Pressed%d",tag);
_buttonIndex=tag;
//_buttonIndex is NSInteger property
//If i add object in NSMutableArray and call reloadData my UI hangs here only.
//If I empty my NSMutableArray and add new objects in it and then call reloadData, I am getting NSRangeException.
}
现在我将这个属性numberOfItemsInSection用作...
if (_buttonIndex==1){
[collectionImage setImage:[UIImage imageNamed:[_array1 objectAtIndex:indexPath.row]]];
//My _array1 has 4 objects and my collectionViewImages array has 7 objects.
}
我正在收到错误消息
*** Terminating app due to uncaught exception 'NSRangeException',
reason: '*** -[__NSArrayM objectAtIndex:]: index 4 beyond bounds [0 .. 3]'
我相信您只是在问如何通过IBAction从UICollectionView添加/删除数据。您只需将一个对象添加到您的UICollectionView's数据源并重新加载。以下是添加内容的示例：
-(IBAction)addObject:(id)sender {
[self.objectArray addObject:@"new object"];
[self.myCollectionView reloadData];
}
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