CODEWITHSUNDEEP
iosobjective-cweb-servicesios7viewcontroller
user2889249
user2889249

Reputation: 909

What is the best way to load data inside a Viewcontroller

I'm writing an iOS app that is getting data from a server. I have several ViewControllers. I used to load data for that viewcontroller under the viewDidLoad method

-(void)ViewDidload
{
    [self loadData];
}


-(void)loadData
{
    //calling to webservice caller class
}

But this reduces the app's performance. What is the best method to load data within a viewcontroller? For webservice callings, I have a seperate class. Within my loadData method I call to that particular method inside the webservice calling class.

This is going to block my UI.

Upvotes: 0

Views: 295

Answers (2)

Zhans
Zhans

Reputation: 263

I guess your interface is lagging. Try this:

-(void)ViewDidload
{
    [NSThread detachNewThreadSelector:@selector(loadData) toTarget:self withObject:nil];
}

Upvotes: 0

Gabriel.Massana
Gabriel.Massana

Reputation: 8225

What do you mean with "this reduces the app performance". Your app is lagging when you are calling your webservice? This is not because you are calling that in viewDidLoad this is because you are doing that in the main thread.

To call your webservice you can use:

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

dispatch_async(queue, ^{

// Call here your web service

    dispatch_sync(dispatch_get_main_queue(), ^{

    // push here the results to your ViewController

    });

});

With this simple solution you are downloading data from your webservice in a separate thread. And pushing the data to your ViewController with the mainThread. This code is not freezing your app. However you will have a moment that nothing happens. This is a good moment to use a UIActivityIndicatorVew.

Upvotes: 2

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