如何在自我视图中添加Picker View

Question

我在添加Picker View时出现问题：

-(void)addPickerView{
   UIPickerView *pickerView = [[UIPickerView alloc]init] ;
    pickerView.frame=CGRectMake(10, 75, 180,180);
    pickerView.delegate = self;
    pickerView.dataSource = self;
    pickerView.showsSelectionIndicator = YES;

    UIToolbar* toolbar = [[UIToolbar alloc] init];
    toolbar.frame=CGRectMake(0,75,180,10);
    toolbar.barStyle = UIBarStyleBlackTranslucent;
    UIBarButtonItem *flexibleSpaceLeft = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

    UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done"style:UIBarButtonItemStyleDone target:self action:@selector(doneClicked:)];
    [toolbar setItems:[NSArray arrayWithObjects:flexibleSpaceLeft, doneButton, nil]];


    [pickerView addSubview:toolbar];
  [self.view addSubview:pickerView];

}

这是我的Picker View With Done ToolBar Button。但是每当我调用AddPickerView方法时都会出现问题：

  

应用程序已崩溃

现在我做什么？

修改

这是崩溃的原因

  

2015-02-03 18：45：47.772 iCricketScore [2040：106045] - [__ NSCFNumber长度]：无法识别的选择器发送到实例0xb000000000000012