ios 键盘遮挡,监听键盘调整view的frame

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

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


;

#pragma mark - keyboard events -

///键盘显示事件
- (void) keyboardWillShow:(NSNotification *)notification {
//获取键盘高度，在不同设备上，以及中英文下是不同的
CGFloat kbHeight = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;

//计算出键盘顶端到inputTextView panel底端的距离(加上自定义的缓冲距离INTERVAL_KEYBOARD)
CGFloat offset = (_passwordTextField.frame.origin.y+_passwordTextField.frame.size.height+INTERVAL_KEYBOARD) - (self.view.frame.size.height - kbHeight);

// 取得键盘的动画时间，这样可以在视图上移的时候更连贯
double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

//将视图上移计算好的偏移
if(offset > 0) {
[UIView animateWithDuration:duration animations:^{
self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);
}];
}
}

//键盘消失事件
- (void) keyboardWillHide:(NSNotification *)notify {
//键盘动画时间
double duration = [[notify.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration:duration animations:^{
self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
}];

}