Day10:UITextView和UIMotion

UITextView:文本视图控件，父类是UIScrollView，用于输入或者显示一行或多行内容，当输入或展示的内容超过textView.fame.size.width时自动换行，当内容超过textView.fame.size.height时自动出现滚动条
UITextField：用来输入一行内容

一.UITextView

1. 常用设置

2. 隐藏键盘方法

3. 模仿微信输入界面

二.UIMotion

手机摇动时执行的方法("UIResponder"中的motionBegan:withEvent方法)

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一.UITextView

1. 常用设置

    UITextView *textView = [[UITextView alloc]initWithFrame:CGRectMake(20, 74, 200, 100)];
    [self.view addSubview:textView];
    //    背景色
    textView.backgroundColor = [UIColor yellowColor];
    //    本文颜色
    textView.textColor = [UIColor greenColor];
    //    字体
    textView.font=[UIFont systemFontOfSize:24];
    //    设置是否允许编辑,默认是YES
    textView.editable = YES;
    //    设置是否允许滚动，默认是YES
    textView.scrollEnabled = YES;
    textView.delegate = self;
    textView.text = @"this is textView";
   

• 隐藏键盘方法

  1. 如果应用程序需要换行符时，可以设置单击换行时隐藏键盘 (缺点: textView一般需要换行功能的存在)

      //协议方法
      //是否允许修改文本内容，默认是YES
      -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
      {
      //    if([text isEqualToString:@"\n"]){
      //        [textView resignFirstResponder];
      //        return NO;
      //    }
          return YES;
      }
     

  2. 用于采用了导航控制器的视图

      //开始编辑时执行此协议方法（在导航栏上添加一个按钮用于隐藏键盘）
      -(void)textViewDidBeginEditing:(UITextView *)textView
      {
          UIBarButtonItem *item=[[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(hideKey)];
          self.navigationItem.rightBarButtonItem=item;
      }
      //编辑结束时执行此协议方法（将导航栏上用于隐藏键盘的按钮项去掉）
      -(void)textViewDidEndEditing:(UITextView *)textView
      {
          self.navigationItem.rightBarButtonItem=nil;
      }
      -(void)hideKey
      {
          UITextView *textView=(UITextView *)[self.view viewWithTag:200];
          [textView resignFirstResponder];
      }
     

  3. 设定一个工具栏

        UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 30)];
      UIBarButtonItem *itemDone = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(hideKey)];
      UIBarButtonItem *item1 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
      NSArray *array = [[NSArray alloc]initWithObjects:item1,itemDone, nil];
      toolBar.items = array;
      //将工具栏设为inputAccessoryView，自动在键盘上面显示，不需要将toolBar再次添加到self.view
      textView.inputAccessoryView = toolBar;
     

• 模仿微信输入界面

  实现方法使视图随着键盘的弹出上移, 随着键盘隐藏收回
  当文本内容超过textView的height时，增加其height

  1. 去消息通知中心订阅一条消息（当键盘将要显示时UIKeyboardWillShowNotification）执行相应的方法
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
     去消息通知中心订阅一条消息（当键盘将要显示时UIKeyboardWillHideNotification）执行相应的方法
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

  2. 当键盘将要显示时，将底部的view向上移到键盘的上面

      -(void)keyboardWillShow:(NSNotification*)notification
      {
          NSLog(@"keyboardWillShow");
          //通过消息中的信息可以获取键盘的frame对象
          NSValue *keyboardObj = [[notification userInfo]objectForKey:UIKeyboardFrameEndUserInfoKey];
      //    获取键盘的尺寸
          CGRect keyrect;
          [keyboardObj getValue:&keyrect];
          CGRect rect=_bottomView.frame;
          //将底部视图的y值设置总高度－键盘的高度－自己的高度
          rect.origin.y=HEIGHT-rect.size.height- keyrect.size.height;
          _bottomView.frame=rect;
      }
     

  当键盘将要隐藏时（将原来移到键盘上面的视图还原）

       -(void)keyboardWillHide:(NSNotification *)notification
       {
        CGRect rect=_bottomView.frame;
        rect.origin.y=HEIGHT-rect.size.height;
        _bottomView.frame=rect;
       }  
  

  当文本内容超过textView的height时，增加其height

           -(void)textViewDidChange:(UITextView *)textView
           {
            //获取内容大小
            CGSize textSize = textView.contentSize;
            //当输入内容尺寸大于textView的大小时，增加内容时
            if(textSize.height>textView.frame.size.height){
                //修改底部视图的大小和坐标
                CGRect vrect=_bottomView.frame;
                //计算出差值
                CGFloat difference=textSize.height-textView.frame.size.height;
                //底部视图的高度增加，y坐标减少相应的差值
                vrect.size.height+=difference;
                vrect.origin.y-=difference;
                _bottomView.frame=vrect;
              //        重设textView的height
                textView.frame=CGRectMake(10, 10, WIDTH-70, textSize.height);
            }
            //当减少内容时，内容尺寸小于textView的大小时，需要调整textView和底部视图的大小，位置
            if(textView.frame.size.height>textSize.height&&textSize.height>30){
                CGFloat difference=textView.frame.size.height-textSize.height;
                CGRect vrect=_bottomView.frame;
                vrect.size.height-=difference;
                vrect.origin.y+=difference;
                _bottomView.frame=vrect;
                textView.frame=CGRectMake(10, 10, WIDTH-70, textSize.height);
                NSLog(@"len=%d",textView.text.length);
                if(textView.text.length==0){
                    textView.frame=CGRectMake(10, 10, WIDTH-70, 30);
                }
            }
          }
  

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UIMotion

• 手机摇动时执行的方法("UIResponder"的方法)

    摇动设备时执行此方法播放声音, 窗口视图frame左右移动
    - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
    {
        NSLog(@"motionBegan");
        SystemSoundID soundID;
        AudioServicesCreateSystemSoundID((__bridge CFURLRef)[[NSBundle mainBundle] URLForResource:@"音效" withExtension:@"caf"], &soundID);
        AudioServicesPlaySystemSound(soundID);
        //增加震动效果
        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
        
        [UIView animateWithDuration:1 animations:^{
            CGRect rect=self.view.frame;
            rect.origin.x+=20;
            self.view.frame=rect;
        } completion:^(BOOL finished) {
            [UIView animateWithDuration:1 animations:^{
                CGRect rect=self.view.frame;
                rect.origin.x-=40;
                self.view.frame=rect;
            } completion:^(BOOL finished) {
                [UIView animateWithDuration:1 animations:^{
                    CGRect rect=self.view.frame;
                    rect.origin.x+=20;
                    self.view.frame=rect;
                } completion:^(BOOL finished) {
                    
                }];
            }];
        }];
    }
  

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