框架类的 键盘监控 消退

- ( void )viewDidLoad { [ super viewDidLoad ]; // register for keyboard notifications [[ NSNotificationCenter defaultCenter ] addObserver : self selector : @selector (keyboardWillShow:） name : UIKeyboardWillShowNotification object : self .view .window ]; // register for keyboard notifications [[ NSNotificationCenter defaultCenter ] 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) CGSize scrollContentSize = CGSizeMake( 3 2 0 , 3 4 5 ); 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. [[ NSNotificationCenter defaultCenter ] removeObserver : self name : UIKeyboardWillShowNotification object :nil ]; // unregister for keyboard notifications while not visible. [[ NSNotificationCenter defaultCenter ] 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. [[ NSNotificationCenter defaultCenter ] removeObserver : self name : UIKeyboardWillShowNotification object :nil ]; // unregister for keyboard notifications while not visible. [[ NSNotificationCenter defaultCenter ] removeObserver : self name :UIKeyboardWillHideNotification object :nil ]; } - ( void )keyboardWillHide:( NSNotification *)n { NSDictionary* userInfo = [n userInfo ]; // get the size of the keyboard CGSize keyboardSize = [[userInfo objectForKey :UIKeyboardFrameBeginUserInfoKey] CGRectValue ] .size ; // resize the scrollview CGRect viewFrame = 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); [ UIView beginAnimations :nil context : NULL ]; [ UIView setAnimationBeginsFromCurrentState : YES ]; // The kKeyboardAnimationDuration I am using is 0.3 [ UIView setAnimationDuration :kKeyboardAnimationDuration]; [ self .scrollView setFrame :viewFrame]; [ UIView commitAnimations ]; 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 CGSize keyboardSize = [[userInfo objectForKey :UIKeyboardFrameBeginUserInfoKey] CGRectValue ] .size ; // resize the noteView CGRect viewFrame = 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); [ UIView beginAnimations :nil context : NULL ]; [ UIView setAnimationBeginsFromCurrentState : YES ]; // The kKeyboardAnimationDuration I am using is 0.3 [ UIView setAnimationDuration :kKeyboardAnimationDuration]; [ self .scrollView setFrame :viewFrame]; [ UIView commitAnimations ]; keyboardIsShown = YES ; }

Tag : keyboard , UIScrollView , 键盘