Question

我试图让2个采摘者进入一个视图控制器，我真的很挣扎。我创建了两个数组，我认为我已经将它们连接起来了，但它们同时出现了拾取器和从同一数据源获取数据的情况。第一个选择器应该更改它所选择的数据（myLabel.text），但它也会改变所选择的职业，就像第二个选择器那样。如果我能在这件事上得到一些帮助，我将不胜感激。谢谢

我也尝试过搜索其他人面临的类似问题，但出于某种原因我无法将其链接到我的代码。

- (void)viewDidLoad {
    [super viewDidLoad];
    myLabel.text = @"Use the scroller above...";

    datePickerView.delegate = self;
    CareerPickerView.dataSource = self;

    _pickerViewArray = @[@"Before September 2012",@"After September 2012"];

    CareerViewArray = @[@"This is choice 1",@"This is choice 2"];        
    CareerPickerView.delegate = self;
}


-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

    NSString *dateSelected = [_pickerViewArray objectAtIndex:row];
    NSString *careerSelected = [CareerViewArray objectAtIndex:row];
    myLabel.text = dateSelected;
    startingsalary.text = careerSelected;

    if ([dateSelected isEqualToString:@"Before September 2012"])
        myLabel.text = @"Before September 2012";

    if ([dateSelected isEqualToString:@"After September 2012"])
        myLabel.text = @"After September 2012";
}


-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return _pickerViewArray.count;
}

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 1;
}

-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return _pickerViewArray[row];
}

@end

Answer 1

您必须在方法delegate

中检查哪个Picker正在调用pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

检查哪个UIPickerView正在调用该方法并执行您需要的操作

Answer 2

您应该维护正确选择的数组和选择器视图。

请按照以下代码：

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
       if(pickerView == datePickerView)
       {
          NSString *dateSelected = [_pickerViewArray objectAtIndex:row];
          myLabel.text = dateSelected;
       }
       else if(pickerView == CareerPickerView)
       {
          NSString *careerSelected = [CareerViewArray objectAtIndex:row];
          startingsalary.text = careerSelected;
       }
}


-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {

    if(pickerView == datePickerView)
    {
      return _pickerViewArray.count;
    }
    else if(pickerView == CareerPickerView)
    {
      return CareerViewArray.count;
    }
    return 1;
}

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}

-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
  if(pickerView == datePickerView)
  {
     return _pickerViewArray[row];
  }
  else if(pickerView == CareerPickerView)
  {
    return CareerViewArray[row];
  }
  return nil;
}

Answer 3

将标签应用于您的UIPickerview，并在每个委托方法中将比较选择器与标签进行比较，确保您在大括号内返回对象以区分标签

1个ViewController中的2个采摘器？ Xcode中

3 个答案: