弹键盘动画
必须在修改约束后调用 .superView layoutIfNeed: 否则没有动画效果
__weak typeof(self)wkSelf = self; self.inputTf.qmui_keyboardWillChangeFrameNotificationBlock = ^(QMUIKeyboardUserInfo *keyboardUserInfo) { wkSelf.checkMoreBtn.hidden = YES; [wkSelf moveUp]; [UIView animateWithDuration:keyboardUserInfo.animationDuration delay:0 options:keyboardUserInfo.animationOptions animations:^{ [wkSelf.allSendBtn mas_updateConstraints:^(MASConstraintMaker *make) { make.bottom.equalTo(-keyboardUserInfo.height); }]; [wkSelf.allSendBtn.superview layoutIfNeeded]; } completion:nil]; };