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데이터를 파싱 한 후 UICollectionView 이미지를로드하는 데 어려움을 겪고 있습니다.UICollectionView 이미지를 스크롤 할 때만 스크롤
이 애플에서 LazyTable 솔루션이며, everythings가있는 tableview에서 작동하지만 난 이동하면
CollectionView 이미지 만 apear. 다른 데이터는 라벨이나 다른 apears와 같습니다.
문제 없이만 이미지가 나에게 문제가됩니다. 여기
내 위임 안에 재 장전 방법 :__block ParseOperation *weakParser = parser;
parser.completionBlock = ^(void) {
if (weakParser.appRecordList) {
dispatch_async(dispatch_get_main_queue(), ^{
CategroyScreenViewController *rootViewController = (CategroyScreenViewController*)[(UINavigationController*)self.window.rootViewController topViewController];
rootViewController.entries = weakParser.appRecordList;
[rootViewController.collectionView reloadData];
});
}
self.queue = nil;
};
[self.queue addOperation:parser];
self.appListData = nil;
}
을하고이 collectionview를 포함 내 CategroyScreenViewController입니다 :
#define kCustomRowCount 7
@interface CategroyScreemViewController() <UIScrollViewDelegate>
@property (nonatomic, strong) NSMutableDictionary *imageDownloadsInProgress;
@property (nonatomic) NSMutableArray* numbers;
@end
int num = 0;
@implementation CategroyScreemViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
NSLog(@"view did load");
[super viewDidLoad];
self.imageDownloadsInProgress = [NSMutableDictionary dictionary];
[self.collectionView reloadData];
}
- (CGSize) blockSizeForItemAtIndexPath:(NSIndexPath *)indexPath {
NSLog(@"Asking for index paths of non-existant cells!! %d", indexPath.row);
if (indexPath.row == 0) return CGSizeMake(2, 2);
return CGSizeMake(1, 1);
}
- (void) viewDidAppear:(BOOL)animated {
NSLog(@"viewDidAppear load");
[self.collectionView reloadData];
}
- (UIEdgeInsets)insetsForItemAtIndexPath:(NSIndexPath *)indexPath {
NSLog(@"insetsForItemAtIndexPath load");
return UIEdgeInsetsMake(2, 2, 2, 2);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
NSArray *allDownloads = [self.imageDownloadsInProgress allValues];
[allDownloads makeObjectsPerformSelector:@selector(cancelDownload)];
[self.imageDownloadsInProgress removeAllObjects];
}
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
NSLog(@"numberOfSectionsInCollectionView load");
return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
NSUInteger count = [self.entries count];
NSLog(@"numberOfItemsInSection load");
if (count == 0)
{
return kCustomRowCount;
}
return count;
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
CategoryScreenCell *myCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];
UILabel *label = (UILabel *)[myCell.contentView viewWithTag:10];
NSUInteger nodeCount = [self.entries count];
if (nodeCount > 0)
{
AppRecord *appRecord = [self.entries objectAtIndex:indexPath.row];
[label setText:appRecord.appName];
if (!appRecord.appIcon)
{
if (self.collectionView.dragging == NO && self.collectionView.decelerating == NO)
{
[self startIconDownload:appRecord forIndexPath:indexPath];
}
myCell.imageView.image = [UIImage imageNamed:@"Placeholder.png"];
}
else
{
myCell.imageView.image = appRecord.appIcon;
}
}
return myCell;
}
- (UIColor*) colorForNumber:(NSNumber*)num {
return [UIColor colorWithHue:((19 * num.intValue) % 255)/255.f saturation:1.f brightness:1.f alpha:1.f];
}
- (void)startIconDownload:(AppRecord *)appRecord forIndexPath:(NSIndexPath *)indexPath
{
IconDownloader *iconDownloader = [self.imageDownloadsInProgress objectForKey:indexPath];
if (iconDownloader == nil)
{
iconDownloader = [[IconDownloader alloc] init];
iconDownloader.appRecord = appRecord;
[iconDownloader setCompletionHandler:^{
CategoryScreenCell *myCell = [self.collectionView dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];
myCell.imageView.image = appRecord.appIcon;
myCell.imageView.layer.masksToBounds = YES;
[self.imageDownloadsInProgress removeObjectForKey:indexPath];
}];
[self.imageDownloadsInProgress setObject:iconDownloader forKey:indexPath];
[iconDownloader startDownload];
}
}
- (void)loadImagesForOnscreenRows
{
NSLog(@"loadImagesForOnscreenRows");
if ([self.entries count] > 0)
{
NSArray *visiblePaths = [self.collectionView indexPathsForVisibleItems];
for (NSIndexPath *indexPath in visiblePaths)
{
AppRecord *appRecord = [self.entries objectAtIndex:indexPath.item];
if (!appRecord.appIcon)
// Avoid the app icon download if the app already has an icon
{
[self startIconDownload:appRecord forIndexPath:indexPath];
}
}
}
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
NSLog(@"scrollViewDidEndDragging");
if (!decelerate)
{
NSLog(@"decelerate");
[self loadImagesForOnscreenRows];
}
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
NSLog(@"scrollViewDidEndDecelerating");
[self loadImagesForOnscreenRows];
}
@end
확인 필자는이 변경 후 :에
CategoryScreenCell *myCell = [self.collectionView dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];
을 이 하나 :
개CategoryScreenCell *myCell = [self.collectionView cellForItemAtIndexPath:indexPath];
프로그램이 잘 작동하지만, 나에게이 경고 제공 : 유형의 식 'CategoryScreenCell *를'초기화 "호환되지 않는 포인터 타입을 'UICollectionViewCell *'
당신은 단지 주조에 의해 경고 제거 할 수
감사합니다. 귀하의 접근 방식은 많은 도움이됩니다. –