#pragma mark - reg & unreg notification
- (void)regNotification
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
- (void)unregNotification
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];
}
#pragma mark - notification handler
- (void)keyboardWillChangeFrame:(NSNotification *)notification
{
NSDictionary *info = [notification userInfo];
CGFloat duration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
CGRect beginKeyboardRect = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
CGRect endKeyboardRect = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGFloat yOffset = endKeyboardRect.origin.y - beginKeyboardRect.origin.y;
CGRect inputFieldRect = self.inputTextField.frame;
CGRect moreBtnRect = self.moreInputTypeBtn.frame;
inputFieldRect.origin.y += yOffset;
moreBtnRect.origin.y += yOffset;
[UIView animateWithDuration:duration animations:^{
self.inputTextField.frame = inputFieldRect;
self.moreInputTypeBtn.frame = moreBtnRect;
}];
}
通過(guò)獲取鍵盤(pán)消息的開(kāi)始狀態(tài)、結(jié)束狀態(tài)，以及變化周期，可以計(jì)算出具體的Y偏移，從而在相同時(shí)間里做相同偏移量。