Question

我在用字符串数组填充UIPickerView时遇到麻烦，每一行都是一个选择。我将在ViewController类中创建一个UIPicker插座，并根据main.async调用生成的数据对UIPicker进行更改。

// Creating our UIView Controller WeldFloorController
// WeldFloorController provides functionality to the WeldFloor screen

class WeldFloorController: UIViewController{

    // Defining the regex String to be used
    let regexString = String( """
((?:<div id=\\d{1,3}>)(UID:\\d{1,3})(currentPartNumber:(.{0,20}))(workcenter:(.{0,20}))(cycleTime:(.{0,20}))(curPartCycleTime:(.{0,20}))(partsMade:(.{0,20}))(CycleTimeActual:(.{0,20}))(target:(.{0,20}))(actual:(.{0,20}))(downtime:(.{0,20}))(statusReason:(.{0,30}))(lineStatus:(.{0,50}))(efficiency:(.{0,20}))(plusminus:(.{0,20}))(curProdTime:(.{0,30}))(<\\/div>))
""");

    // Defining Main Thread for Data updates
    let main = DispatchQueue.main;

    // Intializing all usable objects on screen
    @IBOutlet weak var weldFloorProductionPicker: UIPickerView!;
    @IBOutlet weak var weldFloorDataDisplay: UICollectionView!;

    // Configuring objects on screen happens within viewDidLoad()
    // P*S Since the exectution is happening asynchronous so
    // all updates must be made from within WorkcenterStatus.sharedInstance.run { }
    override func viewDidLoad() {

        // INITIAL CONFIGURATION OF OBJECTS (SUCH AS defaultText etc..) DONE HERE


        // END CONFIG

        // Starting WebService
        WorkcenterStatus.sharedInstance.run { result in
            switch result {

            // If Successful then execute main.async
            // In other words execute everything in .success
            // when webService == Successful
            // [execute main.async] { code here }

            case .success(let htmlBody): self.main.async {
                // First operation -- Return all matches into an array of Strings
                let returnHtml = matches(for: self.regexString, in: htmlBody);

                // Second operation -- For each match return an integer
                let dataPoints = returnHtml.count;

                // Third operation -- Populate our UICollections with our data                   
                // Sub Operation #1 -- Creating the dataSource
                // Edit** I kept this here for one thing ^^ DataSources should be called
                // from a seperate class file or library -- Using dataSources built within
                // the viewController are not reusable unless the dataSource is delegated
                // to another ViewController which at the point it would be just better
                // to create another lib file
                // and call that from there

                // Sub Operation #1 Actual -- Setting a dataSource object


                self.weldFloorProductionPicker.dataSource = returnHtml[];

                };

            // If failed then print error
            case .failure(let error): print(error)
            };
        };
        // Additional Setup
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    };
};

self.weldFloorProductionPicker.dataSource = returnHtml[]; 这不是识别我要将dataSource设置为数组及其所有值的有效方法吗？数组是一维的，我得到的错误是Cannot subscript a value of type '[String]' with an index of type '()'任何帮助将不胜感激

谢谢

Answer 1

您可以尝试

class ViewController: UIViewController , UIPickerViewDelegate,UIPickerViewDataSource {

   var arr = [String]()

  override func viewDidLoad() {   
    super.viewDidLoad()

    self.weldFloorProductionPicker.delegate = self
    self.weldFloorProductionPicker.dataSource = self 

    WorkcenterStatus.sharedInstance.run { result in

        switch result { 
          case .success(let htmlBody):  
            let returnHtml = matches(for: self.regexString, in: htmlBody)
               self.arr = returnHtml 
                DispatchQueue.main.async {
                  self.weldFloorProductionPicker.reloadAllComponents()
                }
            }

        // If failed then print error
        case .failure(let error): 
              print(error)
        }
    }
  }

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

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

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

}

字符串数组作为UIPickerView的数据源

1 个答案: