iOS键盘监听的通知

#pragma mark - 键盘通知回调方法

//  监听键盘的通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrameNotification:) name:UIKeyboardWillChangeFrameNotification object:nil];

/*

UIKeyboardAnimationCurveUserInfoKey = 7;   键盘执行动画的节奏

UIKeyboardAnimationDurationUserInfoKey = "0.25"; 键盘弹出动画执行时间

UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {375, 258}}"; 键盘尺寸

UIKeyboardCenterBeginUserInfoKey = "NSPoint: {187.5, 796}"; 键盘当前的位置

UIKeyboardCenterEndUserInfoKey = "NSPoint: {187.5, 538}";  键盘改变后中心的位置

UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 667}, {375, 258}}"; 键盘当前的frame

UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 409}, {375, 258}}"; 键盘改变后的frame

*/

- (void)keyboardWillChangeFrameNotification:(NSNotification *) notification

{

//    NSLog(@"%@",notification.userInfo);

//  1.取出键盘当前的y坐标

CGRect beginFrame =  [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];

CGRect endFrame =  [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

//  2.中间的差值

CGFloat minus =  endFrame.origin.y - beginFrame.origin.y ;

//  3.根据差值改变控制器view的frame

CGRect viewFrame = self.view.frame;

viewFrame.origin.y += minus;

self.view.frame = viewFrame;

}

#pragma mark - tableView代理方法

/**

*  拖拽tableView方法

*/

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView

{

//  退出键盘

[self.view endEditing:YES];

}

#pragma mark -dealloc方法写到最后

- (void)dealloc

{

//  移除通知

[[NSNotificationCenter defaultCenter] removeObserver:self];

}

//随输入框的高度改变高度 >> 用于ScorllView中添加的View !!!

- (void)keyboardWillHiden:(NSNotification *)notification{

NSDictionary* info = [notification userInfo];

CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);

self.loginScorllView.contentInset = contentInsets;

self.loginScorllView.scrollIndicatorInsets = contentInsets;

CGRect aRect = self.view.frame;

aRect.size.height -= kbSize.height;

if (!CGRectContainsPoint(aRect, self.loginTitle.frame.origin) ) {

CGPoint scrollPoint = CGPointMake(0.0, self.loginTitle.frame.origin.y-kbSize.height);

[ self.loginScorllView setContentOffset:scrollPoint animated:YES];

}

}

//  通用的 >> 只需改 上面ty的值就行!!

-(void) viewDidAppear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShowHandler:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHideHandler:)
name:UIKeyboardWillHideNotification
object:nil];
}

-(void) viewDidDisappear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
}

- (void)keyboardWillShowHandler:(NSNotification *)notification
{
NSDictionary * userInfo = notification.userInfo;

CGRect frameEndUserInfo = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGFloat duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
CGFloat cure = [userInfo[UIKeyboardAnimationCurveUserInfoKey] floatValue];

// CGRect toFrame = self.frame;

CGFloat ty = frameEndUserInfo.origin.y-frameEndUserInfo.origin.y+70;

if (self.view.y != ty) {
[UIView animateWithDuration:duration animations:^{
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationCurve:cure];

self.view.y = -ty;
// self.frame = toFrame;
}];
}
}

- (void)keyboardWillHideHandler:(NSNotification *)notification
{

NSDictionary * userInfo = notification.userInfo;

CGRect frameEndUserInfo = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGFloat duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
CGFloat cure = [userInfo[UIKeyboardAnimationCurveUserInfoKey] floatValue];

// CGRect toFrame = self.frame;

CGFloat ty = frameEndUserInfo.origin.y -frameEndUserInfo.origin.y-64;

if (self.view.y != ty) {
[UIView animateWithDuration:duration animations:^{
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationCurve:cure];

self.view.y = -ty;
// self.frame = toFrame;
}];
}
}