UIWebView Preloader

FISWebViewPreloader is Cocoapod which helps loading UIWebView objects in the background so they can be presented without delays.

Installing FISWebViewPreloader

You can install FISWebViewPreloader in your project by using CocoaPods:

pod 'FISWebViewPreloader', :git => 'https://github.com/jameslin101/FISWebViewPreloader.git'

Using FISWebViewPreloader to create pre-loaded UIWebView objects

Using FISWebViewPreloader is very easy. We recommend creating a private variable to use FISWebViewPreloader:

@property (strong,nonatomic) FISWebViewPreloader *preloader;

....

self.preloader = [FISWebViewPreloader new];

Any time you need to create a pre-loaded UIWebView object, you can add your URL string to FISWebViewPreloader's dictionary.

[self.preloader setURLString:@"http://www.google.com" forKey:@"Google"];

If you need to scale the web pages to fit a certain frame, you can pass the Width and Length values of your frame:

[self.preloader setURLString:@"http://www.apple.com"
                          forKey:@"Apple"
                      withCGRect:CGRectMake(0,0,self.view.frame.size.width, self.view.frame.size.height)];

Adding Capacity constraint with scheduling

If you are concerned about FISWebViewPreloader to take too much memory, you can define a capacity for the number of UIWebViews to be created and pre-loaded.

self.preloader = [[FISWebViewPreloader alloc] initWithCapacity:5 scheduleType:FIFO];

This will make sure that if more than 5 UIWebViews are added, older UIWebViews will be removed based on your specified ScheduleType (LIFO or FIFO). If you try to access an already-dequeued UIWebView, the requested UIWebView will be re-created on the fly.

Whenever you access a UIWebView object it will automatically be placed at the head of the priorityQueue.

Accessing your pre-loaded UIWebView objects

There are two ways of accessing the pre-loaded UIWebView objects. You can either retrieve your UIWebView object at the time of their creation:

UIWebView *googleWebView = [self.preloader setURLString:@"http://www.google.com" forKey:@"Google"];

Alternatively, you can use FISWebViewPreloader's webViewForKey: method:

UIWebView *googleWebView = [self.preloader webViewForKey:@"Google"];

You can use the following method to access the key for a given UIWebView:

NSString *myKey = [self.preloader keyForWebView:googleWebView];
//myKey will be @"Google"

UIWebViewDelegate Protocol:

If your View Controller adheres to the UIWebViewDelegate protocol, then you can use a similar pattern to below to access delegate methods:

-(void)createWebViews
{
    UIWebView *googleWebView = [self.preloader setURLString:@"http://www.google.com" forKey:@"Google"];
    googleWebView.delegate = self;
}

#pragma mark UIWebViewDelegate methods

- (void)webViewDidStartLoad:(UIWebView *)webView {
    NSLog(@"Started loading %@", [self.preloader keyForWebView:webView]);
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSLog(@"Finished loading %@", [self.preloader keyForWebView:webView]);
}

Removing pre-loaded UIWebView objects

You can call the removeWebViewForKey: method to stop the destroy any UIWebView objects that you no longer need:

[self.preloader removeWebViewForKey:@"Google"];

You can also call the reset: method to destroy all key/object pairs in the preloader and the priorityQueue:

[self.preloader reset];