CODEWITHSUNDEEP
iosobjective-cuiscrollview
prince k
prince k

Reputation: 19

How to Manage ScrollView(Up And Down) According Keyboard was Show And Hide in Screen Using NSNotificationCenter in Objective C

Consider I have one screen, and in this screen I have 10 textfields, now my issue is when keyboard is open then keyboard is up on my 3 textfield. so how can i manage this using UIScrollView and NSNotification Center?

Upvotes: 1

Views: 124

Answers (2)

pf0214
pf0214

Reputation: 181

You can create a category of UIView to make it has capability to Observe the UIKeyboardWillShowNotification and UIKeyboardWillHideNotification Notification

like below

@implementation UIView (PFInputViewControl)

-(void)setupKeyboardShow:(void(^)(NSNotification *notifacation))showblock hide:(void (^)(NSNotification *notifacation))hideblock {
      NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
      NSOperationQueue *mainQuene = [NSOperationQueue mainQueue];
      [notificationCenter addObserverForName:UIKeyboardWillShowNotification object:nil queue:mainQuene usingBlock:showblock];

      [notificationCenter addObserverForName:UIKeyboardWillHideNotification object:nil queue:mainQuene usingBlock:hideblock];

     //Setting tap hid gesture when the keyboard is showed and remove the tap gesture when it disappear
     [self setupForDismissKeyboard];
}

-(void)setupForDismissKeyboard{
     NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
     UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapHidAction)];

     __weak typeof(self)weakSelf = self;
     NSOperationQueue *mainQuene = [NSOperationQueue mainQueue];
     [notificationCenter addObserverForName:UIKeyboardWillShowNotification object:nil queue:mainQuene usingBlock:^(NSNotification * _Nonnull note) {
         [weakSelf addGestureRecognizer:singleTap];
     }];

     [notificationCenter addObserverForName:UIKeyboardWillHideNotification object:nil queue:mainQuene usingBlock:^(NSNotification * _Nonnull note) {
         [weakSelf removeGestureRecognizer:singleTap];
     }];
 }

@end

And in your usage ,you just need to import the category file,and then setup the code 

    [self.view setupKeyboardShow:^(NSNotification *notification) {

         //========== do your action when keyboard is show ==========
         //....
         //
         //such as
         NSDictionary* info = [notification userInfo];
         //get the size of key board
         CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
         //make transform when key board show
         self.view.y = - kbSize.height;

     } hide:^(NSNotification *notification) {
         //.... key board hid action
         self.view.y = 0;
         //....
     }];


     //setup keyboard dismiss when touch the screen out side the keyboard
     [self.view setupForDismissKeyboard];

Upvotes: 0

sumit
sumit

Reputation: 61

Yes I have One Code For this, I am Sure its Definitely Work For you.

 [[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWasShown:)
                                             name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillBeHidden:)
                                             name:UIKeyboardWillHideNotification object:nil];

// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
   CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey]   CGRectValue].size;
   UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
   MyScrollView.contentInset = contentInsets;
   MyScrollView.scrollIndicatorInsets = contentInsets;
 }

// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
   UIEdgeInsets contentInsets = UIEdgeInsetsZero;
   MyScrollView.contentInset = contentInsets;
   MyScrollView.scrollIndicatorInsets = contentInsets;
}

Upvotes: 1

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