如何在Swift 3的PickerView中爲行設置標題？

Question

我需要根據數組給出行的標題，但我不知道如何做到這一點。我是iOS新手。

class ViewController: UIViewController , UIPickerViewDelegate, UIPickerViewDataSource{ 

    @IBOutlet weak var pickerView: UIPickerView! 
    @IBOutlet weak var label: UILabel! 
    var names: Array<String>? 
    var department: Array<String>? 
    override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 
     names = ["Vineeta", "Shubham" ,"Anand", "Vivek", "Akshay", "Harshit", "Vikas", "Prasoon", "Sunil"] 
     department = ["iOS","Angular", ".Net", "iOS","iOS", ".Net", "Android","Android", "Angular"] 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

    func numberOfComponents(in pickerView: UIPickerView) -> Int { 
     return 2 
    } 
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { 
     return 9 
    } 

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { 
     if component == 0 { 
      [names o] 
     } 
    } 


} 

Answer 1

使用此代碼 -

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { 
    if component == 0 { 
     return names?.count 
    } 
    else 
    return department?.count 

} 

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { 
    if component == 0 { 
     return names?[row] 
    } 
    else 
    { 
     return department?[row] 
    } 
}