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我的代码如下，将产生正确数量的数组，但显示数据只会取最后一个值并重复显示。 例如：只有最后图像存储在阵列中获取显示在表视图
当我选择第一张图片时，第一张图片成功显示在表格视图中。 当我选择第二个图像时，数组将有2个数据，但问题是在表视图中，我会得到2个相同的图像（第二个选定的图像）。我的预期结果将是当选择第二个图像时，第一个图像仍然在那里，第二个显示在子序列行。
- (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代码!!
- (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全码!!
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只是一个UIImage。每次你调用assetForURL：方法，galleryImage都会被替换。在for循环完成之后如此明显，您的galleryImage将包含最后一幅图像。您可以使用NSMutableArray代替galleryImage，并将图像添加到循环中的每个迭代的数组中。 – iCoder
这是工作（请参阅我上面编辑的代码），但是如果用户删除添加在表视图中的图像是有点麻烦，因为需要从不同的数组中逐个删除。它有其他简单的方法来维护数组吗？ – yukiko
最好考虑建立一个模型。我编辑了下面添加模型的代码。希望能帮助到你 ：） 。 – iCoder