CODEWITHSUNDEEP
iosswifturlpreloadwkwebview
JimmyJammed
JimmyJammed

Reputation: 9698

WKWebView: Is it possible to preload multiple URLs?

Just migrated an app over to WKWebView and was wondering if there is any possible way to 'preload' multiple URLs, but only display one at a time?

I have a list of 5 URLs. I already know that I will be shown at some point in time, and I want to speed up the experience by pre-loading these for use in a single WKWebView.

Upvotes: 2

Views: 3183

Answers (4)

Wonixer A
Wonixer A

Reputation: 126

Use NSURLCache

Here is the code

Swift

// Create URLRequest
    var request: URLRequest? = nil
    if let url = URL(string: "YOUR_URL") {
        request = URLRequest(url: url)
    }
    
    // Check the cache.
    var cachedResponse: CachedURLResponse? = nil
    if let request = request {
        cachedResponse = URLCache.shared.cachedResponse(for: request)
    }
    print(cachedResponse != nil ? "Cached response found!" : "No cached response found.")
   // Load the cache
    do {
        if let request = request {
            try NSURLConnection.sendSynchronousRequest(request, returning: nil)
        }
    } catch {
    }

Obj-C

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:@"YOUR_URL"]];

    // Check the cache.
    NSCachedURLResponse *cachedResponse = [[NSURLCache sharedURLCache] cachedResponseForRequest:request];
    NSLog(cachedResponse ? @"Cached response found!" : @"No cached response found.");
    //Load cache
    [NSURLConnection sendSynchronousRequest:request returningResponse:NULL error:NULL];

Upvotes: 0

JimmyJammed
JimmyJammed

Reputation: 9698

I ended up just using NSURLCache and preloading all URLs using NSURLRequest and NSURLConnection. Then whenever I load a url into WKWebView it uses the cached requests per my cache policy.

Upvotes: 4

Stefan Arentz
Stefan Arentz

Reputation: 34935

You can also preload five different WKWebView instances and swap them in/out when you need a specific URL. This depends on your UI and interaction of course.

Upvotes: 0

user3821934
user3821934

Reputation:

A relatively straight-forward way to do this is to create five NSData objects (asynchronoulsly), each initialized using the known urls. When you need to display one of them, you can convert the NSData to a string, and then call WKWebView's loadHTMLString function to change the displayed page.

Upvotes: 2

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