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Preselected options in UIPickerView when app starts SWIFT

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I am new at Swift and I need help.I have 4 UIPickerViews that have some data. Result ( that are combination of 4 ) is shown in Label. And everything is working smoothly, but what I want is, when the app starts there is some preselected values in those pickerviews that are not showing results before I manually change those values. When I start picking values I get results in Label. My question is how to show those results when the app starts with those preselected values?


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