Uipickerview Selectrow Doesn't Works

UIPickerView selectRow doesn't works

While inside the viewDidLoad method, your picker is empty. Since there is no 6th element to pick, it doesn't pick it.

You can do this if you delay execution of the select call until after the data is finished loading. Likely one cycle will be enough.

First though, try moving your select to viewDidAppear.

Good luck!

UIPicker selectRow not working - what's wrong with this code?

It works if I put it in this method:

-(void) viewWillAppear: (BOOL) animated

UIPickerView selectRow not working as expected

One of the weird eccentricities of UIPickerView is that when you call

`[.. selectRow: inComponent: animated: ]`

this will trigger a call on the delegate's

[pickerView: didSelectRow: inComponent: ]

As a result of this it can be easy to create inadvertent race conditions, so check in your delegate's pickerView: didSelectRow: inComponent: method and be aware that this is being called in the middle here as a result of setting the first component. You might be better off storing a variable for what is selected in component0 and switching off that rather than off what is selected in the picker. You might also consider storing a boolean (listenToPicker) so you can switch it off temporally by putting the didSelect stuff inside a if (listenToPicker){ ..... }, then before setting it up with the selectRow: animated: calls you can set listenToPicker to NO, restoring it to YES after all components are set in viewDidAppear . Good luck

How to force UIPickerView.selectRow call didSelectRow method?

This to select the row

 self.yourPickerViewName.selectRow(2, inComponent: 0, animated: true)

and this to trigger the method

 self.pickerView(self.yourPickerViewName, didSelectRow: 2, inComponent: 0)

Combine them to simulate user action

How can I set selectRow on a UIPickerView that is attached to a UITextField

enum AvailableColors: Int {
    case yellow = 0
    case blue = 1
    case red = 2
    case green = 3

    var colorByIndex: UIColor {
        switch (self) {
        case .yellow:
            return .yellow
        case .blue:
            return .blue
        case .red:
            return .red
        case .green:
            return .green
        }
    }
}

class ViewController: UIViewController, UIPickerViewDelegate {
    var picker : UIPickerView?
    var selectedIndex = 0

   override func viewDidLoad() {
       super.viewDidLoad()
       //1.init your picker with data.
       // self.picker = UIPickerView()...
       // self.picker.delegate = self
       //2.select predefined index
       self.picker?.selectRow(self.selectedIndex, inComponent: 0, animated: false)

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
       self.selectedIndex = row
       self.textField.backgroundColor = AvailableColors(rawValue: row)?.colorByIndex
    }
}

Selecting a row in a UIPickerView - swift

It looks like you only have 3 elements in your picker. Pickerview element rows are 0-indexed, so instead of

pickerview.selectRow(1, inComponent: 0, animated: true)
pickerview.selectRow(2, inComponent: 0, animated: true)
pickerview.selectRow(3, inComponent: 0, animated: true)

you'll want

pickerview.selectRow(0, inComponent: 0, animated: true)
pickerview.selectRow(1, inComponent: 0, animated: true)
pickerview.selectRow(2, inComponent: 0, animated: true)

PickerVIew.selectRow doesn't work

Change your numberOfRowsInComponent datasource method to the following:

// returns the # of rows in each component..
@available(iOS 2.0, *)
public func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
    switch component {
    case 0: return component1.count
    case 1: return component2.count
    case 2: return component3.count
    default: return 0
    }
}

You should also add a break statement after your estAutoWin = true line since you do not have to continue looping when you found a matching fruit.

estAutoWin = true
break

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