IOS键盘

• UIKeyboardFrameBeginUserInfoKey：动画开始前键盘的size
• UIKeyboardFrameEndUserInfoKey：动画结束后键盘的size

- (void)registeKeyboardNotification{    [[NSNotificationCenter defaultCenter] addObserver:self                                             selector:@selector(keyboardWasShown:)                                                 name:UIKeyboardDidShowNotification object:nil];        [[NSNotificationCenter defaultCenter] addObserver:self                                             selector:@selector(keyboardWillBeHidden:)                                                 name:UIKeyboardWillHideNotification object:nil];}- (void)unRegisteKeyboardNotification{    [[NSNotificationCenter defaultCenter] removeObserver:self];}- (void)keyboardWasShown:(NSNotification*)aNotification{    NSDictionary* info = [aNotification userInfo];    // 动画结束后键盘的size    CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;           UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);    scrollView.contentInset = contentInsets;    scrollView.scrollIndicatorInsets = contentInsets;        // frame为scrollView要滑动到的位置    CGRect frame;    [scrollView scrollRectToVisible:frame animated:YES];}// Called when the UIKeyboardWillHideNotification is sent- (void)keyboardWillBeHidden:(NSNotification*)aNotification{    UIEdgeInsets contentInsets = UIEdgeInsetsZero;    scrollView.contentInset = contentInsets;    scrollView.scrollIndicatorInsets = contentInsets;}