Xcode 8/Swift 3:简单的 UIPicker 代码不起作用 [英] Xcode 8 / Swift 3 : Simple UIPicker code not working

问题描述

我有协议:

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

我有数据:

let muteForPickerData = ["minute(s)","hour(s)"]

在 viewDidLoad 我有:

muteForPicker.delegate = self
muteForPicker.dataSource = self

然后我有必需的方法:

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
            return 1
        }

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
            return muteForPickerData.count
        }

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
            return muteForPickerData[row]
        }

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    }

我还是明白了

类型视图控制器不符合协议 UIPickerViewDataSource

type viewcontroller does not conform to protocol UIPickerViewDataSource

推荐答案

UIPickerViewDataSource 方法 numberOfComponentsInPickerView 在 Swift 3 中像这样更改，这就是您收到此错误的原因.

UIPickerViewDataSource method numberOfComponentsInPickerView is changed in Swift 3 like this that is the reason you are getting this error.

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return muteForPickerData.count
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return muteForPickerData[row]
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

}

有关更多详细信息，请阅读 UIPickerView 上的 Apple 文档.

For more detail read Apple Documentation on UIPickerView.

注意:您还需要添加 _ 作为第一个参数标签，与 UIPickerViewDelegate 方法中的其他方法相同，即 titleForRow 和 didSelectRow.

Note: You need to also add _ as first parameter label same like other methods in your UIPickerViewDelegate method that is titleForRow and didSelectRow.

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