swift中的pickerView不顯示數據

這看起來太簡單了，無法限定帖子，但我一直在這個問題上比id更長。 pickerView不顯示數組[持續時間]。運行時，模擬器只是空的領域。代碼直接從UI類複製，但它似乎缺少一些東西。swift中的pickerView不顯示數據

class FirstViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource { 

@IBOutlet weak var durationPicker: UIPickerView! 

var durations = ["72 hours", "24 hours", "6 hours", "2 hours", "20 minutes"] 
var durationsValue = [72.0, 24.0, 6.0, 2.0, 0.329] 
var itemSelected: String = "" 
var selectedDuration: Double = 0.0 


override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 
} 

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




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

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { 
    return 5 
} 


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


func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { 
    itemSelected = durations[row] 
    selectedDuration = durationsValue[row] 
    } 
}

來源

2015-04-15 Austin Thomas

你設置選擇器的數據源和委託？ –

我建議你看這段視頻。這位女士在解釋各種iOS相關主題方面做得非常出色。

https://www.youtube.com/watch?v=MdXmIViD17U

，在跳出我的問題是你得在上面指定的陣列。您應該使用return yourArray.count來返回Int s，而不是硬編碼值。

來源

2015-04-15 18:24:13 Adrian

您需要設置delegate和datasource內viewDidLoad()

durationPicker.delegate = self 
durationPicker.dataSource = self

或者只是連接你的選擇器delegate和datasource使用Xcode的接口

來源

2015-04-15 18:30:53

swift中的pickerView不顯示數據

回答

相關問題