UITables with Asynchronous Downloading of Images

Now you may easily implement the concept of Asynchronus Image loading on your iphone application.

We all know that when a table view has several images then first it has to download all the images from internet after then tabel view appears.

In this example LoadImageFromURL will return right away, the image will load in the background, and will automatically appear in the view when its finished downloading. Before the image is downloaded, it will show a default placeholder image and it can be set inside the code of 'AsyncImage.m' file-

    }else {

  // Use a default placeholder when no cached image is found

  UIImageView *imageView = [[[UIImageView alloc] initWithImage:[UIImage

                   imageNamed:@"placeholder.png"]] autorelease];

  imageView.contentMode = UIViewContentModeScaleAspectFit;

  imageView.autoresizingMask =

  UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

  [self addSubview:imageView];

  imageView.frame = self.bounds;

  [imageView setNeedsLayout];

  [self setNeedsLayout];

 }

And if you want to set a ActivityView during the image download, you may also set that-

    UIActivityIndicatorView *spinny = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];

    spinny.tag = SPINNY_TAG;

    spinny.center = self.center;

    [spinny startAnimating];

    [self addSubview:spinny];

    [spinny release];

Find an easygoing sample app here.