Question

错误：

类型'GearViewController'不符合协议 'UIPickerViewDataSource'

基于apple documentation，UIPickerViewDataSource只需要2个方法。两者都包含在下面的代码中。我认为语法是正确的。（但可能不是）

类/控制声明和init。（为清楚起见，删除了许多其他代码。如果需要，可以使用完整代码，我会编辑。只是想保持简短。）

class  GearViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, UIPickerViewDataSource, UIPickerViewDelegate{

@IBOutlet weak var pickerGearCategory: UIPickerView!

override func viewDidLoad() {

        super.viewDidLoad()

        pickerGearCategory.dataSource = self
        pickerGearCategory.delegate = self

    }

委托和数据源

  let gearCategoryPickerData = CategoryRepository.allCategories()
    //MARK: CategoryPicker- Delegates and data sources
    //MARK: CategoryPicker - Data Sources


    //Required
    func numberOfComponents(in pickerGearCategory: UIPickerView) -> Int {
        return 1
    }

    //Required
    func pickerGearCategory(pickerGearCategory: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return gearCategoryPickerData.count
    }


    func pickerGearCategory(pickerGearCategory: UIPickerView,titleForRow row: Int, forComponent component: Int) -> String? {
        return gearCategoryPickerData[row].name
    }

Answer 1

numberOfComponents在哪里，但pickerView在哪里？

Answer 2

您实施的协议方法之一是错误的，方法应该是：

func pickerView(UIPickerView, numberOfRowsInComponent: Int) {
//Your implementation here
}

您已将该方法实施为

func pickerGearCategory(pickerGearCategory: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
//Your implementation
}

纠正它，你应该好好去。

Answer 3

只需添加vmask = ~np.in1d(np.arange(m*n),rm_idx[1] + n*np.arange(m)) out = arr.reshape(-1,p)[vmask].reshape(m,-1,p) 功能

错误：类型'GearViewController'不符合协议'UIPickerViewDataSource'

3 个答案: