ios - 如何在后台下载图像以在iOS中使用imageView进行设置？

Question

我使用了以下代码，但不适用于我。

UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(markerView.bounds.size.width/10, markerView.bounds.size.height/4, markerView.bounds.size.width*4/5, markerView.bounds.size.height/1.5)];

NSString *strPath = [NSString stringWithFormat:@"%@",[[arrTemp valueForKey:@"image"] objectAtIndex:marker.accessibilityLabel.integerValue]];
NSLog(@"img path %@", strPath);

dispatch_async(dispatch_get_main_queue(), ^{
  UIImage *img = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:strPath]]];
  imgView.image = img;
});

Answer 1

您可以在下面尝试代码。
它为我工作。

        NSString *str = [NSString stringWithFormat:@"%@",[[[dictTemp valueForKey:@"image"] objectAtIndex:j] valueForKey:@"imagepath"]];
        NSString *strSub = [str stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
        NSURL *imgUrl = [NSURL URLWithString:[NSString stringWithFormat:@"%@",strSub]];

        dispatch_queue_t q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);
        dispatch_async(q, ^{
            /* Fetch the image from the server... */
            NSData *data = [NSData dataWithContentsOfURL:imgUrl];
            UIImage *img = [[UIImage alloc] initWithData:data];

            dispatch_async(dispatch_get_main_queue(), ^{

                [imageView setImage:img];
            });
        });