框架类的 键盘监控 消退

- (void)viewDidLoad

{

    [superviewDidLoad];

 

    // register for keyboard notifications

    [[NSNotificationCenterdefaultCenter]addObserver:self

       selector:@selector(keyboardWillShow:）

       name:UIKeyboardWillShowNotification

       object:self.view.window];

    // register for keyboard notifications

    [[NSNotificationCenterdefaultCenter]addObserver:self

       selector:@selector(keyboardWillHide:)

       name:UIKeyboardWillHideNotification

       object:self.view.window];

    keyboardIsShown = NO;

    //make contentSize bigger than your scrollSize

    //(you will need to figure out for your own use case)

    CGSizescrollContentSize = CGSizeMake(320,345);

    self.scrollView.contentSize= scrollContentSize;

}

 

- (void)viewDidUnload {

    // Release any retained subviews of the main view.

    // e.g. self.myOutlet = nil;

 

    // unregister for keyboard notifications while not visible.

    [[NSNotificationCenterdefaultCenter]removeObserver:self

       name:UIKeyboardWillShowNotification

       object:nil];

    // unregister for keyboard notifications while not visible.

    [[NSNotificationCenterdefaultCenter]removeObserver:self

       name:UIKeyboardWillHideNotification

       object:nil]; 

}

 

- (void)dealloc {

    // Release any retained subviews of the main view.

    // e.g. self.myOutlet = nil;

 

    // unregister for keyboard notifications while not visible.

    [[NSNotificationCenterdefaultCenter]removeObserver:self

       name:UIKeyboardWillShowNotification

       object:nil];

    // unregister for keyboard notifications while not visible.

    [[NSNotificationCenterdefaultCenter]removeObserver:self

       name:UIKeyboardWillHideNotification

       object:nil]; 

}

 

- (void)keyboardWillHide:(NSNotification*)n

{

    NSDictionary* userInfo = [n userInfo];

    // get the size of the keyboard

    CGSizekeyboardSize =

        [[userInfoobjectForKey:UIKeyboardFrameBeginUserInfoKey]

           CGRectValue].size;

    // resize the scrollview

    CGRectviewFrame = self.scrollView.frame;

    // I'm also subtracting a constant kTabBarHeight because my UIScrollView

    // was offset by the UITabBar so really only the portion of the keyboard that

    // is leftover pass the UITabBar is obscuring my UIScrollView.

    viewFrame.size.height+= (keyboardSize.height- kTabBarHeight);

    [UIViewbeginAnimations:nilcontext:NULL];

    [UIViewsetAnimationBeginsFromCurrentState:YES];

    // The kKeyboardAnimationDuration I am using is 0.3

    [UIViewsetAnimationDuration:kKeyboardAnimationDuration];

    [self.scrollViewsetFrame:viewFrame];

    [UIViewcommitAnimations];

    keyboardIsShown = NO;

}

 

- (void)keyboardWillShow:(NSNotification*)n

{

    // This is an ivar I'm using to ensure that we do not do the frame size

    // adjustment on the UIScrollView if the keyboard is already shown. 

    // This can happen if the user, after fixing editing a UITextField,

    // scrolls the resized UIScrollView to another UITextField and attempts

    // to edit the next UITextField.  If we were to resize the UIScrollView again,

    // it would be disastrous. NOTE: The keyboard notification will fire

    // even when the keyboard is already shown.

    if(keyboardIsShown) {

        return;

    }

 

    NSDictionary* userInfo = [n userInfo];

 

    // get the size of the keyboard

    CGSizekeyboardSize =

        [[userInfoobjectForKey:UIKeyboardFrameBeginUserInfoKey]

           CGRectValue].size;

 

    // resize the noteView

    CGRectviewFrame = self.scrollView.frame;

    // I'm also subtracting a constant kTabBarHeight because my UIScrollView

    // was offset by the UITabBar so really only the portion of the keyboard

    // that is leftover pass the UITabBar is obscuring my UIScrollView.

    viewFrame.size.height-= (keyboardSize.height- kTabBarHeight);

    [UIViewbeginAnimations:nilcontext:NULL];

    [UIViewsetAnimationBeginsFromCurrentState:YES];

    // The kKeyboardAnimationDuration I am using is 0.3

    [UIViewsetAnimationDuration:kKeyboardAnimationDuration];

    [self.scrollViewsetFrame:viewFrame];

    [UIViewcommitAnimations];

    keyboardIsShown = YES;

}

Tag : keyboard , UIScrollView , 键盘