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uiimageview 异步加载图片         本文转载至 http://*.com/questions/16663618/async-image-loading-from-url-inside-a-uitableview-cell-image-changes-to-wrong

分类: IT文章 • 2023-11-23 23:05:19

    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){

        

        NSURL *url = [NSURL URLWithString: detailedActivity.pictures];

        NSData *data = [[NSData alloc] initWithContentsOfURL:url];

        

        dispatch_async(dispatch_get_main_queue(), ^(void){

            

            self.activityImageView.image = [[UIImage alloc]initWithData:data];

        });

    });

 

 

 

 

本文转载至 http://*.com/questions/16663618/async-image-loading-from-url-inside-a-uitableview-cell-image-changes-to-wrong

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34

I've written two ways to async load pictures inside my UITableView cell. In both cases the image will load fine but when I'll scroll the table the images will change a few times until the scroll will end and the image will go back to the right image. I have no idea why this is happening.

#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)

- (void)viewDidLoad
{
    [super viewDidLoad];
    dispatch_async(kBgQueue, ^{
        NSData* data = [NSData dataWithContentsOfURL: [NSURL URLWithString:
                                                       @"http://myurl.com/getMovies.php"]];
        [self performSelectorOnMainThread:@selector(fetchedData:)
                               withObject:data waitUntilDone:YES];
    });
}

-(void)fetchedData:(NSData *)data
{
    NSError* error;
    myJson = [NSJSONSerialization
              JSONObjectWithData:data
              options:kNilOptions
              error:&error];
    [_myTableView reloadData];
}    

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    // Return the number of rows in the section.
    // Usually the number of items in your array (the one that holds your list)
    NSLog(@"myJson count: %d",[myJson count]);
    return [myJson count];
}
    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

        myCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
        if (cell == nil) {
            cell = [[myCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
        }

        dispatch_async(kBgQueue, ^{
        NSData *imgData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://myurl.com/%@.jpg",[[myJson objectAtIndex:

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