Screen freeze while loading UIWebview

Question

I am Loading HTML String in UIWebView,text content get loaded in a sec but there is lot of images in HTML String, cause of this image my UIWebView get freeze, after loaded all images my screen get free to use.

Any Suggestion on this?

Have you implemented delegate of uiwebview? Can you show your code? — Nirav D, Jun 22 '16 at 11:06
yes i implemented delegates, but i think the problems in the images, after load all images my uiwebview gets free. — Nikunj Suthar, Jun 22 '16 at 11:13
NO, actually after loaded UIWebview i resize the height of UIWebview. — Nikunj Suthar, Jun 22 '16 at 11:17

score 1 · Answer 1 · edited Jun 22 '16 at 19:58

1

Load webview in dispatch thread, try this:

dispatch_async(dispatch_get_main_queue(), ^{
    [self.webView loadHTMLString:@"htmlstring" baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];
});

edited Jun 22 '16 at 19:58

Borys Verebskyi

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answered Jun 22 '16 at 11:15

Satyanarayana

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score 0 · Answer 2 · answered Jun 22 '16 at 11:20

0

I think it's freezing because you're loading a images from web in your main thread, Which is also responsible for redrawing your UI. By loading a large images inside your thread, your UI freezes as well.

I would recommend moving the code that does images loading into a separate thread. (you can use @Andey's answer)

answered Jun 22 '16 at 11:20

Suraj Sukale

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I tried andey's solution but still getting issue, the problems is in the images because if i disconnect the net then string get loaded into UIWebview and screen not get freeze. – Nikunj Suthar Jun 22 '16 at 11:39
you're loading a images from web in your main thread.try to do into a separate thread. – Suraj Sukale Jun 22 '16 at 11:59

Ray Tso · Answer 3 · 2016-06-22T15:39:28.533

Like @Andey said, you should dispatch off the main queue whenever the thing you're doing will take some time and you don't want your view to freeze.

Try lecture 9: https://itunes.apple.com/en/course/developing-ios-8-apps-swift/id961180099

UPDATE (Swift ver.):

Although I do not know how to write this in Obj-C, it will look something like this in Swift, which you can later translate it back to Obj-c.

dispatch_async(notTheMainQueue) {
    // Some time consuming stuff you're doing (downloading data, calculating..)
    ...
    dispatch_async(dispatch_get_main_queue) {
        // Set your view here, which dispatches *back* to the main queue and will not block your UI
        ...
    }
}

Screen freeze while loading UIWebview

3 Answers3