comparing array's through index in Swift 2

Question

For my education I build to build a dictionary app which is readable through picker view. It has basically a dutchwords array and a English words array.

And I can ad words as well. This is all working. And i though i could give the user the correct throw their indexes.

//selected by picker view
if englishDic.index == dutchDic.index{ 
    //correct answer
}
else{
    //wrong answer
}

It doesn't work this way.

maybe post some more code?

R Menke
– R Menke

2016-01-03 00:41:38 +00:00
Commented Jan 3, 2016 at 0:41 — R Menke
– R Menke, Commented Jan 3, 2016 at 0:41

tebs1200 · Accepted Answer · 2016-01-03 00:45:48Z

1

Arrays don't have an index property that you can access like that. What you probably want to do is capture the selected index for each picker in the Picker View's didSelectRow function in the UIPickerViewDelegate.

Once you've stored those in variables, you can compare the selected indexes.

answered Jan 3, 2016 at 0:45

tebs1200

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5 Comments

tebs1200 Over a year ago

It's important to note that the arrays are the 'data source' for the picker view. The array doesn't 'know' that it is being used by a picker view, so updating the selection in the picker view has no impact at all on the array.

Bart-Jan Van Rossum Over a year ago

@IBAction func checkTranslationButton(sender: AnyObject) { func pickerView(pickerview: UIPickerView, didSelectRow: Int, inComponent: Int) { var action1 = pickerView(<#T##pickerView: UIPickerView##UIPickerView#>, didSelectRow: 0, inComponent: 0) var action2 = pickerView(<#T##pickerView: UIPickerView##UIPickerView#>, didSelectRow: 0, inComponent: 1) } The errors i get is that i can't get the int from the rows. So I'm stuck. Sorry to bother you again.

tebs1200 Over a year ago

The didSelectRow functions will get called when a user selects a row (as the name implies.) These shouldn't be nested in your 'button' function. You need to... 1 - create variables in your ViewController to store the selected index for each picker. 2 - Update these variables using the didSelectRow functions. 3 - Compare the variables in your checkTranslationButton function.

tebs1200 Over a year ago

If you're going to get into iOS development, it's really important to be across the Delegation Pattern. I can see that this is the concept you are struggling with here.

Bart-Jan Van Rossum Over a year ago

And that is my basic problem as well. how can i make the two variations to select the two rows/index from the picker view.

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