Ios7 集合视图仅在IOS中的页面加载时加载

我使用集合视图在用户选择的滑块中显示多个图像，但主要问题是集合视图仅在页面加载时加载。而包含图像的数组是在页面加载后生成的。这就是为什么不加载图像，因为一旦加载页面，集合视图就不会加载。 我不太了解收集视图，所以请引导我。。。 我的代码如下：-

- (void)elcImagePickerController:(ELCImagePickerController *)picker didFinishPickingMediaWithInfo:(NSArray *)info
 {
   [self dismissViewControllerAnimated:YES completion:nil];

   _imageList= [NSMutableArray arrayWithCapacity:[info count]];

for (NSDictionary *dict in info)
{
   UIImage *image  = [dict objectForKey:UIImagePickerControllerOriginalImage];
    [_imageList addObject:image];

}

self.chosenImages = _imageList;

}

---

_集合视图中的imageList项目数未加载

加载imageList后，重新加载集合视图

- (void)elcImagePickerController:(ELCImagePickerController *)picker didFinishPickingMediaWithInfo:(NSArray *)info
 {
   [self dismissViewControllerAnimated:YES completion:nil];

   _imageList= [NSMutableArray arrayWithCapacity:[info count]];

for (NSDictionary *dict in info)
{
   UIImage *image  = [dict objectForKey:UIImagePickerControllerOriginalImage];
    [_imageList addObject:image];

}

self.chosenImages = _imageList;

//重新加载集合视图

- (void)elcImagePickerController:(ELCImagePickerController *)picker didFinishPickingMediaWithInfo:(NSArray *)info
 {
   [self dismissViewControllerAnimated:YES completion:nil];

   _imageList= [NSMutableArray arrayWithCapacity:[info count]];

for (NSDictionary *dict in info)
{
   UIImage *image  = [dict objectForKey:UIImagePickerControllerOriginalImage];
    [_imageList addObject:image];

}

self.chosenImages = _imageList;

[collectionview reloadData];

}