Question

我在滚动视图中有图像数组。我点击图片时想从网址上传更大的图片。例如，我点击图像“page-001.jpg”，然后检查图像数据，然后在图像视图上上传更大的图像并返回选项，以便返回上一个图像视图。

Answer 1

试试这个

NSMutableArray *arr = [[NSArray alloc] initWithObjects:imageURL,imageView.tag, nil];
[self performSelectorInBackground:@selector(loadImageInBackground:) withObject:arr];



- (void) loadImageInBackground:(NSArray *)urlAndTagReference 
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    // Retrieve the remote image. Retrieve the imgURL from the passed in array
    NSURL *imgUrl=[[NSURL alloc] initWithString:[urlAndTagReference objectAtIndex:0]];                 
    NSData *imgData = [NSData dataWithContentsOfURL:imgUrl];
    UIImage *img = [UIImage imageWithData:imgData];
    [imgUrl release]; 

    // Create an array with the URL and imageView tag to 
    // reference the correct imageView in background thread.

    NSMutableArray *arr = [[NSMutableArray alloc ] initWithObjects:img,[urlAndTagReference objectAtIndex:1], nil  ];

    // Image retrieved, call main thread method to update image, passing it the downloaded UIImage

    [self performSelectorOnMainThread:@selector(assignImageToImageView:) withObject:arr waitUntilDone:YES];
    [arr release];
    [pool release];
}

- (void) assignImageToImageView:(NSMutableArray *)imgAndTagReference
{
    UIImageView *profilePic = (UIImageView *)[cell.contentView viewWithTag:20];
    imageView.image = [imgAndTagReference objectAtIndex:0];
}

Answer 2

您可以使用SDWebImage。只需将文件添加到项目中并使用

即可

[UIImageview setImageWithURL:(NSURL*)url];

这个库也管理缓存，在UITableViewCell中运行良好。

在滚动视图中从网址上传图片

2 个答案: