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我的代碼如下，將產生正確數量的數組，但顯示數據只會取最後一個值並重復顯示。 例如：只有最後圖像存儲在陣列中獲取顯示在表視圖
當我選擇第一張圖片時，第一張圖片成功顯示在表格視圖中。 當我選擇第二個圖像時，數組將有2個數據，但問題是在表視圖中，我會得到2個相同的圖像（第二個選定的圖像）。我的預期結果將是當選擇第二個圖像時，第一個圖像仍然在那裏，第二個顯示在子序列行。
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(@"Collector in photoList %@",self.collector);
for (int i = 0; i < collector.count; i++) {
// define the block to call when we get the asset based on the url (below)
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *imageAsset)
{
ALAssetRepresentation *imageRep = [imageAsset defaultRepresentation];
CGImageRef iref = [imageRep fullResolutionImage];
if (iref) {
galleryImage = [UIImage imageWithCGImage:iref];
[self.tableView reloadData];
}
NSLog(@"[imageRep filename] : %@", [imageRep filename]);
};
NSLog(@"Collector %@",self.collector);
// get the asset library and fetch the asset based on the ref url (pass in block above)
ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc]init];
[assetslibrary assetForURL:[collector objectAtIndex:i] resultBlock:resultblock failureBlock:nil];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.imageView.image = galleryImage;
NSLog(@"Gallery image is %@",self.galleryImage);
return cell;
}
EDITED！
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(@"Collector in photoList %@",self.collector);
for (int i = 0; i < collector.count; i++) {
// define the block to call when we get the asset based on the url (below)
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *imageAsset)
{
ALAssetRepresentation *imageRep = [imageAsset defaultRepresentation];
CGImageRef iref = [imageRep fullResolutionImage];
if (iref) {
galleryImage = [UIImage imageWithCGImage:iref];
//Added mutable array for galleryImage
[photoCollector addObject:galleryImage];
[self.tableView reloadData];
}
NSLog(@"[imageRep filename] : %@", [imageRep filename]);
};
NSLog(@"Collector %@",self.collector);
// get the asset library and fetch the asset based on the ref url (pass in block above)
ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc]init];
[assetslibrary assetForURL:[collector objectAtIndex:i] resultBlock:resultblock failureBlock:nil];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
//Display image
if(photoCollector.count != 0)
{
cell.imageView.image = [self.photoCollector objectAtIndex:indexPath.row];
}
NSLog(@"This is in cellForRowAtIndexPath");
NSLog(@"Gallery image is %@",self.galleryImage);
// Configure the cell...
return cell;
}
在拾取器didFinishPickingMediaWithInfo EDITED代碼!!
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
// Initialize View Controller
PhotosListViewController *photoListViewController = [[PhotosListViewController alloc]initWithNibName:@"PhotosListViewController" bundle:nil];
ImageModel *imgModel = [[ImageModel alloc]init];
// get the ref url
imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];
//set the imageUrl to the imageModel url in property ?
imgModel.url = imageURL;
[self.collector addObject:imageURL];
photoListViewController.urlCollector = self.collector;
NSLog(@"Collector in root %@",self.collector);
[picker dismissViewControllerAnimated:YES completion:nil];
[self.navigationController pushViewController:photoListViewController animated:YES];
}
EDITED全碼!!
RootViewController.m
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
// Initialize View Controller
PhotosListViewController *photoListViewController = [[PhotosListViewController alloc]initWithNibName:@"PhotosListViewController" bundle:nil];
// get the ref url
imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];
[self.collector addObject:imageURL];
photoListViewController.urlCollector = self.collector;
NSLog(@"Collector in root %@",self.collector);
[picker dismissViewControllerAnimated:YES completion:nil];
[self.navigationController pushViewController:photoListViewController animated:YES];
}
ImageModel.h
#import <Foundation/Foundation.h>
typedef void(^handler)(UIImage *image);
@interface ImageModel : NSObject
@property (nonatomic, strong) NSURL *imageUrl;
- (void)getImageWithCompletionHandler:(handler)completionBlock;
@end
ImageModel.m
#import "ImageModel.h"
#import <MobileCoreServices/MobileCoreServices.h>
#import <AssetsLibrary/AssetsLibrary.h>
@implementation ImageModel
@synthesize imageUrl;
- (void)getImageWithCompletionHandler:(handler)completionBlock
{
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *imageAsset)
{
ALAssetRepresentation *imageRep = [imageAsset defaultRepresentation];
CGImageRef iref = [imageRep fullResolutionImage];
if (iref) {
UIImage *image = [UIImage imageWithCGImage:iref];
completionBlock(image);
}
};
ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc]init];
[assetslibrary assetForURL:self.imageUrl resultBlock:resultblock failureBlock:nil];
}
@end
PhotoListViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
test1 = [[UIImage alloc]init];
self.imageModelObjects = [NSMutableArray array];
for(NSURL *url in self.urlCollector)
{
ImageModel *imageModel = [[ImageModel alloc] init];
imageModel.imageUrl = url;
[self.imageModelObjects addObject:imageModel];
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
ImageModel *model = [self.imageModelObjects objectAtIndex:indexPath.row];
[model getImageWithCompletionHandler:^(UIImage *image) {
dispatch_async(dispatch_get_main_queue(), ^{
cell.imageView.image = image;
});
}];
return cell;
}
GalleryImage只是一個UIImage。每次你調用assetForURL：方法，galleryImage都會被替換。在for循環完成之後如此明顯，您的galleryImage將包含最後一幅圖像。您可以使用NSMutableArray代替galleryImage，並將圖像添加到循環中的每個迭代的數組中。 – iCoder
這是工作（請參閱我上面編輯的代碼），但是如果用戶刪除添加在表視圖中的圖像是有點麻煩，因爲需要從不同的數組中逐個刪除。它有其他簡單的方法來維護數組嗎？ – yukiko
最好考慮建立一個模型。我編輯了下面添加模型的代碼。希望能幫助到你 ：） 。 – iCoder