TTImageView refresh image - three20

Question

I have the following code
TTImageView* chart = [[[TTImageView alloc] initWithFrame:CGRectMake(2,2,30, 30)] autorelease];
chart.backgroundColor = [UIColor clearColor];
chart.defaultImage = nil;
chart.urlPath = #"http://test.com/test.png";
And I need to refresh the image, so I call reload function on the
chart. However the chart is not refreshed.
I found out that TTURLCache cached the image. So in app delegate when
app just started i do the following:
[TTURLCache sharedCache].disableImageCache = YES;
[[TTURLCache sharedCache] removeAll:YES];
However, the image is still not refreshed. Any help would be
appreciated. I also realized that whenever I do [chart reload], and check [chart isLoading] it is always true, which means that the request is not sent somehow.

Answer 1

Add a reload call after you set the URL and make sure you are calling from the main thread
[chart reload];

Answer 2

I ran into a similar issue when I tried loading my users avatars into a UIButton view. I needed to use TTImageView's delegate protocol to update the button's image. For example:
self.avatarImageView = [[TTImageView alloc] initWithFrame:CGRectMake(10, 10, 50, 50)];
self.avatarImageView.defaultImage = TTIMAGE(#"bundle://defaultAvatar.png");
self.avatarImageView.delegate = self;
self.avatarImageView.urlPath = #"http://www.site.com/path/to/image.png"
Once the urlPath is set, the request is made in the background. When you conform to the TTImageViewDelegate, you can access the following delegate methods.
/**
* Called when the image begins loading asynchronously.
*/
- (void)imageViewDidStartLoad:(TTImageView*)imageView {
NSLog(#"loading image...");
}
/**
* Called when the image finishes loading asynchronously.
*/
- (void)imageView:(TTImageView*)imageView didLoadImage:(UIImage*)image {
NSLog(#"loaded image!");
[self.avatarImageButton setImage:image forState:UIControlStateNormal];
}
/**
* Called when the image failed to load asynchronously.
* If error is nil then the request was cancelled.
*/
- (void)imageView:(TTImageView*)imageView didFailLoadWithError:(NSError*)error {
NSLog(#"error loading image - %#", error);
}
When the image has loaded successfully, I can use it for my UIButton as you'll see in the imageView:didLoadImage method.
Hope this helps shed some light on this issue. I know it's an old question, but maybe it'll help others later on.

Answer 3

After clearing the cache you should also reset the TTImageView. A simple way to do it would be to call [chart unsetImage] and then set the urlPath again.
Another way to do it without clearing the cache would be to add a dummy parameter to the url.
chart.urlPath = #"http://test.com/test.png?dummy=dummy";