SDWebImage不显示下载图像

Question

I used SDWebImage library for downloading remote images from server. But while im in EDGE connection it taking too much time and after downloading the NSLog values are displaying but images are not showing under UIButton

code:

int Width = 0;

        for (int i = 0; i<[productimg_array count]; i++ ) {

            NSLog(@"index %@", productimg_array[i]);

            imgView1=[[UIButton alloc]initWithFrame:CGRectMake(20+(i*74), 0, 72, 72)];

            Width = Width + 20+(i*74);

            [imgView1 setTag:i+1];

            [imgView1 addTarget:self action:@selector(dbClicked:) forControlEvents:UIControlEventTouchUpInside];

            // [imgView1 setImageWithURL:[NSURL URLWithString:[productimg_array objectAtIndex:i]]
            //   forState:UIControlStateNormal];

           [imgView1 setImageWithURL:[NSURL URLWithString:[productimg_array objectAtIndex:i]]  forState:UIControlStateNormal completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {

            NSLog(@"download images 1");
          }];

          [scrollview addSubview:imgView1];

        }

[scrollview setContentSize:CGSizeMake(Width,imgView1.frame.size.height+20)];

Answer 1

Maybe there is an error or a timeout. Try this change and maybe we can find more:

[imgView1 setImageWithURL:[NSURL URLWithString:[productimg_array objectAtIndex:i]]  forState:UIControlStateNormal completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
    if(error){
        NSLog(@"Callback Error:%@",error);
    }
    if(image){
        NSLog(@"Callback Image:%@",image);
    }
}];

Answer 2

Heres something that worked for me, I keep the loop but I don't use it so it matches your code. I declared imgView1 to be a UIButton and I hardcoded a URL to a stackoverflow image. I recommend you check the type of imgView1 and the content of productimg_array

int Width = 0;
UIButton *imgView1;
for (int i = 0; i<1; i++ ) {


    imgView1=[[UIButton alloc]initWithFrame:CGRectMake(20+(i*74), 0, 72, 72)];

    Width = Width + 20+(i*74);

    [imgView1 setTag:i+1];

    [imgView1 addTarget:self action:@selector(cancelPressed:) forControlEvents:UIControlEventTouchUpInside];

    [imgView1 setImageWithURL:[NSURL URLWithString:@"http://cdn.sstatic.net/stackoverflow/img/sprites.png?v=6"]  forState:UIControlStateNormal completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {

        NSLog(@"download images 1");
    }];

    [self.view addSubview:imgView1];

}

Answer 3

You can use this method from UIButton+WebCache.h

- (void)setImageWithURL:(NSURL *)url forState:(UIControlState)state;

Calling this is similar,

[imgView1 setImageWithURL:[NSURL URLWithString:[productimg_array objectAtIndex:i]] forState:UIControlStateNormal];

This method will download the image and directly set it to the button.

Hope that helps!