SDImageCache placeholder gif

Question

I am trying to create a gif as a place holder for my SDImageCache.

So first off I created the gif:

    _imageView =[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, cell.thumbnailImageView.frame.size.width,
                                                              cell.thumbnailImageView.frame.size.height)];
    _imageView.animationImages = [NSArray arrayWithObjects:
                                 [UIImage imageNamed:@"Polygon 1 copy.bolt_00000"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00000"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00001"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00002"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00003"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00004"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00005"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00006"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00007"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00008"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00009"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00010"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00011"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00012"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00013"], [UIImage imageNamed:@"Polygon 1 copy.bolt_00014.png"], nil];
    _imageView.animationRepeatCount = 500;

I then turned it into an UIimage

UIImage *imagety = _imageView.image; // get the UIImage
UIImage *otherImage = [UIImage imageNamed:@"Loadimage.png"]; // load another image
_imageView.image = otherImage; // change in the image in your UIImageView

following that I put it as the placeholder:

 SDImageCache *imageCache = [SDImageCache sharedImageCache];
    [imageCache queryDiskCacheForKey:encodedString done:^(UIImage *image, SDImageCacheType cacheType) {

        if (image){
            cell.thumbnailImageView.image = image;
        }else{
            [cell.thumbnailImageView setImageWithURL:[NSURL URLWithString:encodedString] placeholderImage:imagety completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
                [imageCache storeImage:image forKey:encodedString]; 
            }];
        }
    }];

But this does not seem to work? Do you have any ideas why?

could you elaborate more on what is not working exactly? the placeholder image is not displayed, is it? — sergio, Jun 10 '14 at 21:00

score 0 · Answer 1 · edited Jun 20 '20 at 09:12

If you check the value returned by _imageView.image:

UIImage *imagety = _imageView.image;

you should see that it is nil. This is due to your using animationImages to handle an animation through the view.

You cannot have a UIImageView (or the animation associated to it) used as a placeholder image in SDImage.

You could use:

UIImage *imagety = [UIImage animatedImageWithImages:
                         [NSArray arrayWithObjects:
                             [UIImage imageNamed:...],
                             nil]
                    duration:10.0f];

(docs)

animatedImageWithImages:duration:

Creates and returns an animated image from an existing set of images.
   + (UIImage *)animatedImageWithImages:(NSArray *)images duration:(NSTimeInterval)duration

So is this not the way to put an animated gif as the place holder? — maxisme, Jun 12 '14 at 10:48

SDImageCache placeholder gif

1 Answers1