为什么集合View Cells没有在iOS中显示？

Question

嗨我可以从图库中获取图像但是collectionViewCells没有在UI上显示.i拖放collectionView给了委托和数据方法的连接。但是为什么没有得到CollectionViewCells.I已经编写了这样的代码

- (void)viewDidLoad  
{ 
imagesArray = [NSMutableArray array]; 
[self.collectionView registerNib:[UINib nibWithNibName:@"MyCell" bundle:nil] forCellWithReuseIdentifier:@"CELL"]; 
}   

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info  
{ 
inputImage= info[UIImagePickerControllerEditedImage]; [imagesArray addObject:inputImage];
[picker dismissViewControllerAnimated:YES completion:nil];
} 

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView; {
return 1;
} 

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section 
{ 
return [imagesArray count];
} 

- (MyCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath 
{ 
MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CELL" forIndexPath:indexPath];
if(!cell) { 
cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CELL"forIndexPath:indexPath];
}
recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image =[imagesArray objectAtIndex:indexPath.row];        
[collectionView reloadData];
return cell;
}

请有人建议我如何做这件事。非常感谢

Answer 1

问题是你在cellForItemAtIndexPath中调用reloadData。这将导致无限循环。

Answer 2

确保您拥有imageArray数据。并尝试在collectionView方法

中重新加载imagePickerController:didFinishPickingMediaWithInfo:

- (void)viewDidLoad { 
 imagesArray = [NSMutableArray array]; 
 [self.collectionView registerNib:[UINib nibWithNibName:@"MyCell" bundle:nil] forCellWithReuseIdentifier:@"CELL"]; 
      }  

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { 

inputImage= info[UIImagePickerControllerEditedImage];
[imagesArray addObject:inputImage];
[self.collectionView reloadData];
[picker dismissViewControllerAnimated:YES completion:nil];
}

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView; {
return 1;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section 
{ 
return [imagesArray count];
} 

- (MyCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath 
{ 
MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CELL" forIndexPath:indexPath];
if(!cell) { 
cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CELL"forIndexPath:indexPath];
}
recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image =[imagesArray objectAtIndex:indexPath.row]; 
return cell;
}