Keyboard 视图随键盘升高降低

(void)viewWillAppear:(BOOL)animated

{

[[NSNotificationCenter
defaultCenter]addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];

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

}

- (void)keyboardWillShow:(NSNotification *)noti

{

//得到keyboard size

CGRect keyboardBounds;

[[noti.userInfo
valueForKeyPath:UIKeyboardFrameEndUserInfoKey]getValue:&keyboardBounds];

CGRect frame ;

if (version<7.0) {

frame =
CGRectMake(0,
0, mainHeight,
mainHeight-20);;

}else{

frame =
CGRectMake(0,
0, mainHeight,
mainHeight);;

}

[UIView
beginAnimations:nil
context:NULL];

[UIView
setAnimationBeginsFromCurrentState:YES];

[UIView
setAnimationDuration:0.3f];

if (mainHeight<500) {

frame.origin.y -=
110;

}
else {

frame.origin.y -=
25;

}

_backView.frame = frame;

[UIView
commitAnimations];

}

- (void)keyboardWillHide:(NSNotification *)noti

{

//得到keyboard size

CGRect keyboardBounds;

[[noti.userInfo
valueForKeyPath:UIKeyboardFrameEndUserInfoKey]getValue:&keyboardBounds];

CGRect frame ;

if (version<7.0) {

frame =
CGRectMake(0,
0, mainHeight,
mainHeight-20);;

}else{

frame =
CGRectMake(0,
0, mainHeight,
mainHeight);;

}

[UIView
beginAnimations:nil
context:NULL];

[UIView
setAnimationBeginsFromCurrentState:YES];

[UIView
setAnimationDuration:0.3f];

_backView.frame = frame;

[UIView
commitAnimations];

}