Ios 图像未显示在我的UICollectionView中
所以我一直在寻找解决这个问题的方法,但似乎什么都找不到。我有一个数组,我使用下面的方法加载图像路径Ios 图像未显示在我的UICollectionView中,ios,iphone,objective-c,uiimageview,uicollectionview,Ios,Iphone,Objective C,Uiimageview,Uicollectionview,所以我一直在寻找解决这个问题的方法,但似乎什么都找不到。我有一个数组,我使用下面的方法加载图像路径 - (IBAction)btnPictures:(id)sender { // Create the next view controller. ImageGalleryViewController *galleryViewController = [[ImageGalleryViewController alloc] initWithNibName:@"ImageGalleryViewCont
- (IBAction)btnPictures:(id)sender {
// Create the next view controller.
ImageGalleryViewController *galleryViewController = [[ImageGalleryViewController alloc] initWithNibName:@"ImageGalleryViewController" bundle:nil];
// Search for paths and get users home directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
// get path at first index (in case multiple returned
NSString *documentsDirectory = [paths objectAtIndex:0];
NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:nil];
NSArray *files = [dirContents filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"pathExtension IN %@", @"png"]];
// Pass the selected object to the new view controller.
[galleryViewController setImageArray:files];
// Push the view controller.
[self.navigationController pushViewController:galleryViewController animated:YES];
}
然后将该图像数组发送到my UICollectionViewController中的以下方法
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
ImageGalleryViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"ImageGalleryViewCell" forIndexPath:indexPath];
NSLog(@"Image at index %@", [imageArray objectAtIndex:indexPath.row]);
[cell.galleryImage setImage:[UIImage imageWithContentsOfFile:[imageArray objectAtIndex:indexPath.row]]];
[cell setBackgroundColor:[UIColor whiteColor]];
return cell;
}
我通过NSLog验证了objectAtIndex是否返回了有效的图像名称,但由于某些原因,单元格未显示该名称
非常感谢您的帮助,提前谢谢。我想您在使用(取消)单元格之前没有初始化任何单元格。初始化您的手机,然后重试。祝你好运
PS:通过初始化,我的意思是,
alloc
init
您的单元格。NSFileManager的-contentsOfDirectoryAtPath:
返回的数组不提供完整的文件路径,只提供文件和目录的名称。您必须将数组中的每个值附加到文档目录的路径中
大概是这样的:
NSString *documentsDirectoryPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
NSString *imagePath = [documentsDirectoryPath stringByAppendingPathComponent:[imageArray objectAtIndex:indexPath.row]];
UIImage *image = [UIImage imageWithContentsOfFile:imagePath];
尝试将
ImageGalleryViewCell
更改为collectionView:cellForItemAtIndexPath()方法中的返回类型。也许它是有效的。就是这样,为新手的错误道歉:)再次感谢!没问题。这个问题我自己也经历过一次。:)