CODEWITHSUNDEEP
iphoneioscocoa-touch
OpenThread
OpenThread

Reputation: 2094

How to update UIImageView async?

I have a UITableView with lots of UIButton. Large local images displayed in buttons. I use this code to load large image async(UIButton's category):

- (void)asyncLoadImageAtPath:(NSString *)fullPath forState:(UIControlState)state
{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        UIImage *image = [[UIImage alloc] initWithContentsOfFile:fullPath];
        dispatch_async(dispatch_get_main_queue(), ^{
            [self setImage:image forState:state];
        });
    });
}

initWithContentsOfFile: running in other thread, while update UI by setImage:forState: in main thread. But setImage:forState: costs too much time, it makes UITableView scroll not smoothly.

So is there any way to update UIImageView or UIButton's UI async?

Special thanks!

Upvotes: 0

Views: 283

Answers (2)

jcesarmobile
jcesarmobile

Reputation: 53301

For async images I use AsyncImageView, it works fine on tableViews

Upvotes: 1

freelancer
freelancer

Reputation: 1658

check out the SDWebImage, This library provides a category for UIImageVIew with support for remote images coming from the web.

Upvotes: 1

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