iOS 输入框随键盘上移以及点击tableView回收键盘

最新推荐文章于 2018-08-19 23:53:56 发布

DeviL_NSLog

最新推荐文章于 2018-08-19 23:53:56 发布

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分类专栏： iOS开发文章标签： iOS

本文链接：https://blog.youkuaiyun.com/qq_22955427/article/details/79239949

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本文介绍如何在iOS应用中处理输入框与键盘交互的问题，详细讲解了如何让输入框随键盘上移，并在点击tableView时有效回收键盘。通过数组存储需要移动的控件，以及为tableView添加点击手势来实现这一功能。

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//注册通知
-(void)viewWillAppear:(BOOL)animated{
 
    [super viewWillAppear:animated];
    
    //键盘出现
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    //键盘回收
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    
}
//移除通知
-(void)viewDidDisappear:(BOOL)animated{
    
    [super viewDidDisappear:animated];
    
    [[NSNotificationCenter defaultCenter]removeObserver:self];
    
}

//键盘出现
- (void)keyboardWillShow:(NSNotification *)notification
{
    //获取处于焦点中的view
    NSArray *textFields = @[_people_num, _scale,_leader_name,_leader_phoneNum]; //将需要上移的控件存在这个数组
    UIView *focusView = nil;
    for (UITextField *view in textFields) {
        if ([view isFirstResponder]) {
            focusView = view;
            break;
        }
    }
    if (focusView) {
        //获取键盘弹出的时间
        double duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
        //获取键盘上端Y坐标
    
        CGFloat keyboardY = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue].origin.y;
        //获取输入框下端相对于window的Y坐标
        CGRect rect = [focusView convertRect:focusView.bounds toView:[[[UIApplication sharedApplication] delegate] window]];
        CGPoint tmp = rect.origin;
        CGFloat inputBoxY = tmp.y + focusView.frame.size.height;
        //计算二者差值
        CGFloat ty = keyboardY - inputBoxY;
        NSLog(@"position keyboard: %f, inputbox: %f, ty: %f", keyboardY, inputBoxY, ty);
        //差值小于0，做平移变换
        [UIView animateWithDuration:duration animations:^{
            if (ty < 0) {
                self.view.transform = CGAffineTransformMakeTranslation(0, ty);
            }
        }];
    }
}


//键盘回收
- (void)keyboardWillHide:(NSNotification *)notification
{
    //获取键盘弹出的时间
    double duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    //还原
    [UIView animateWithDuration:duration animations:^{
        self.view.transform = CGAffineTransformMakeTranslation(0, 0);
    }];
}

将需要随键盘上移的控件存入数组

 NSArray *textFields = @[_people_num, _scale,_leader_name,_leader_phoneNum];

给tableView添加点击手势

//给tableView添加手势.  在tableView处添加以下代码
    UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideKeyBoard)];
    tapGestureRecognizer.cancelsTouchesInView = NO;//设置成NO表示当前控件响应后会传播到其他控件上，默认为YES。
    [self.tableView addGestureRecognizer:tapGestureRecognizer];

 //点击事件
-(void)hideKeyBoard
{
    [self.view endEditing:YES];
}