键盘处理

键盘处理——使用

Map

window会发送通知，我们接收通知就可以了

1.布局：

2.拉成属性（私有）：

@property(weak,nonatomic)IBOutletUIView*inputView;

3.实现

//程序显示的时候调用
- (void)viewWillAppear:(BOOL)animated
{
    [superviewWillAppear:animated];
    //先拿到通知中心
    NSNotificationCenter *center = [NSNotificationCenterdefaultCenter];
    //收听通知

    //UIKeyboardWillShowNotification键盘将要显示的一个通知

    //UIKeyboardWillShowNotification;<-键盘将要显示

    //UIKeyboardDidShowNotification;<-键盘已经显示

    //UIKeyboardWillHideNotification;<-键盘将要隐藏

    //UIKeyboardDidHideNotification;<-键盘已经隐藏

    //监听键盘显示
    [center addObserver:selfselector:@selector(keyboardAppear:)name:UIKeyboardWillShowNotificationobject:nil];
    //监听键盘隐藏
    [center addObserver:selfselector:@selector(keyboardDisappear:)name:UIKeyboardWillHideNotificationobject:nil];

}

//释放后调用
- (void)viewWillDisappear:(BOOL)animated
{
    [superviewWillDisappear:animated];
    //删除
    [[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillShowNotificationobject:nil];
    [[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillHideNotificationobject:nil];

}

//UIKeyboardFrameBeginUserInfoKey<-键盘开始(弹起)的时候有多大        

//UIKeyboardFrameEndUserInfoKey<-键盘结束(隐藏)的时候有多大         

//UIKeyboardAnimationDurationUserInfoKey<-键盘弹起的时候动画有多长

//键盘显示(弹起)的方法
- (void)keyboardAppear:(NSNotification*)notification
{
    //1.获取键盘的高度
    //生成字典

    NSDictionary *userInfo = notification.userInfo;

    NSLog(@"%@",userInfo);//此处输出下面有截图

    //拿到动画结束之后的frame CGRect不能放到NSDictionary里，所以是NSValue
    NSValue *value = userInfo[UIKeyboardFrameEndUserInfoKey];
    //拿到frame
    CGRect keyboardFrame = [valueCGRectValue];
   
    //2.计算输入框的frame
    CGRect inputFrame =self.inputView.frame;
    //设置键盘弹起后inputView的位置
    //视图的高-键盘的高-inputView的高
    inputFrame.origin.y=self.view.bounds.size.height- keyboardFrame.size.height- inputFrame.size.height;
    //3.设置动画

    //动画的时间[userInfo[UIKeyboardAnimationDurationUserInfoKey]doubleValue]<-键盘动画时间[转成doubleValue] 

    NSTimeInterval duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey]doubleValue];
    //动画是先快后慢还是先快后慢
    UIViewAnimationOptions options = [userInfo[UIKeyboardAnimationCurveUserInfoKey]intValue];
    [UIViewanimateWithDuration:durationdelay:0 options:optionsanimations:^{
        self.inputView.frame= inputFrame;

    } completion:nil];

}

//键盘隐藏的方法
- (void)keyboardDisappear:(NSNotification*)notification
{
    //拿到frame
    CGRect frame = self.inputView.frame;
    //修改y
    frame.origin.y=self.view.bounds.size.height- frame.size.height;
    NSDictionary *userInfo = notification.userInfo;
    NSTimeInterval duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey]doubleValue];
    UIViewAnimationOptions options = [userInfo[UIKeyboardAnimationCurveUserInfoKey]intValue];
    [UIViewanimateWithDuration:durationdelay:0 options:optionsanimations:^{
        self.inputView.frame= frame;
    } completion:nil];

}

//拉拽

- (IBAction)inputCompletion:(UITextField*)sender
{
    //释放

    [sender resignFirstResponder];

}

此时，键盘就能实现弹起和隐藏了并且inputView会随着键盘的弹起而变化

键盘缩回去：

---

在上面的代码基础上修改

声明属性（私有）：

@property(strong,nonatomic)NSMutableArray*messages;

@property(strong,nonatomic)UITableView*tableView;

实现：

- (NSMutableArray*)messages
{
    if(!_messages)_messages= [[NSMutableArrayalloc]init];
    return _messages;

}

- (IBAction)inputCompletion:(UITextField*)sender

{

    //把输入的信息加入到messages中
    [self.messagesaddObject:sender.text];
    //刷新数据
    [self.tableViewreloadData];
}

//纯代码创建一个tableView别忘了遵守协议<UITableViewDataSource>

staticNSString*cellIdentifier =@"MessageCell";
- (void)viewDidLoad
{
    [superviewDidLoad];
    UITableView *tableView = [[UITableViewalloc]initWithFrame:self.view.framestyle:UITableViewStylePlain];
    self.tableView= tableView;
    tableView.dataSource=self;
    //注册cell
    [tableView registerClass:[UITableViewCellclass]forCellReuseIdentifier:cellIdentifier];
    //[self.view addSubview:tableView];
    //因为手动创建tableView在storyboard之后创建的，storyboard会被tableView
    [self.viewinsertSubview:tableViewatIndex:0];
}

- (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.messages.count;
}

- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
    UITableViewCell *cell = [tableViewdequeueReusableCellWithIdentifier:cellIdentifierforIndexPath:indexPath];
    cell.textLabel.text=self.messages[indexPath.row];
    return cell;
}