监听键盘- KeyBoard

- (void)KeyBoardShowOrHide

{

    // NSNotificationCenter 通知中心

    // 检测键盘将要消失的状态

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

    

    // 检测键盘将要弹出的状态

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

}

- (void)hideKeyBoard:(NSNotification *)sender

{

    NSLog(@"键盘退出");

    // 还原

    self.view.transform = CGAffineTransformIdentity;

    

}

- (void)showKeyBoard:(NSNotification *)sender

{

    //NSLog(@"%@",sender.userInfo);

    // 获取键盘高度

    CGRect rect = [[sender.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

    CGFloat keyBoardH = rect.size.height;

    

    self.view.transform = CGAffineTransformMakeTranslation(0, - keyBoardH);

    

}

注意：当写注册页面时，由于textField太多，用此方法会导致，第一个textField在编辑时看不见，看得见时，有没有键盘。根据李老师的提议，把textField添加到scrollView中，不过我暂时没有实现过。