斯威夫特：EXC_BAD_INSTRUCTION（代码=EXC_I386_INVOP，子代码=0x0）

Question

您好，我是 swift 新手，需要一些帮助

每次我运行我的代码时，我的应用程序都会崩溃并吐出“上述错误”

谁能告诉我我需要做什么或需要在我的代码中替换什么？

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource{


    @IBOutlet weak var picker: UIPickerView!
    var employeeNames = ["John","Jane","Jack","James"]


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.


        self.picker.delegate = self
        self.picker.dataSource = self
    }

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

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

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

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        print(employeeNames[row])
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }   
}

Answer 1

您的代码绝对没问题，所以唯一的选择是您没有连接您的 pickerView 插座。 Ctrl 在情节提要中单击您的选择器视图，然后查看您的出口“选择器”是否出现。如果没有，则 ctrl 从 pickerView 拖动到您的插座以连接它。