Why my ViewDidLoad Loads every time?

Question

I am Creating a App in which I implemented FB login. So i write a FBLogin button code in my ViewDidLoad in ViewController.m file.

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

FBSDKLoginButton *loginButton = [[FBSDKLoginButton alloc] init];
loginButton.center = self.view.center;
[self.view addSubview:loginButton];

}

but when i ran this code. fb buttons appears in all pages of my app, it means my viewController.m ViewDidLoad method call every time.Why? I am looking for solution last 4 hours but didnt get any result yet. please help me out.

Do your view controllers inherit from this view controller? Also, without seeing more code, we can only take blind shots at it. — Lord Zsolt, May 08 '15 at 07:56
The view appearing in multiple pages is an indication of reuse of this class, not `viewDidLoad` being called multiple times — saurabh, May 08 '15 at 08:00
@Lord Zsolt- yes. my view controllers inherit from this view controller. — M Swapnil, May 08 '15 at 08:05
instantiating view controller only results calling viewdidLoad..so it means your current ViewController.m is instantiating somewhere..so figure out that — LC 웃, May 08 '15 at 08:09
@anish - all my classes are inherit with this view controller. like interface contestViewController : ViewController. Can this be a reason for my error? — M Swapnil, May 08 '15 at 08:12
yeah..thats the point..so figureout the solution that helps instanitating view controller only once..one example is here http://stackoverflow.com/questions/29699001/how-to-make-viewdidload-method-of-viewcontroller-residing-inside-containerview-c — LC 웃, May 08 '15 at 08:15
@anish- thnx, I will post if i find any solution. thnx for your suggestions. — M Swapnil, May 08 '15 at 08:16
yeah..if you cant, try posting your project...we will give a try — LC 웃, May 08 '15 at 08:17
never ask for +1 on SO..try to get it auto....but i will do it for you — LC 웃, May 08 '15 at 08:21

score 2 · Answer 1 · answered May 08 '15 at 08:10

As you've said, your view controllers inherit from this view controller, thus every view controller who calls [super viewDidLoad] will execute this method. (The solution isn't the removal of the super call).

Instead of creating this ViewController and every other view controller inherit from this one you could:

Create a CommonViewController which implements everything that is common between your view controllers
Create a FacebookLoginViewController which also inherit from CommonViewController.

Thus, your inheritance tree would look like:

CommonViewController
      /          \
     /            \
    /              \
FacebookLoginVC    OtherViewControllers

Instead of:

ViewController (which is equivalent to FacebookViewController)
     |
     |
     |
OtherViewControllers

score 0 · Accepted Answer · answered May 08 '15 at 09:46

Here is the Answer for my question

I made a small mistake when i inherit all Other ViewControllers and main ViewController class with ViewController. i modified my code with

 @interface ViewController : UIViewController


 @end

instead of

 @interface ViewController : ViewController

 @end

and all other classes too like

   @interface homeViewController : UIViewController

   @interface contestViewController : UIViewController


   @interface menuViewController : UIViewController

etc.

This simply solved my question. thanks for the help guys.

Why my ViewDidLoad Loads every time?

2 Answers2