<分区>
我已经尝试了所有以前的建议来解决这个问题，但仍然没有成功。它工作正常(UIPickerView 正确填充)，但现在应用程序在 viewDidLoad() 运行后崩溃。已验证所有 IBOutlet 均已正确连接。尝试重新创建 cocoa touch 文件。
这是我的 View Controller 代码。这一定是我忽略的小事。帮忙!!
class SettingsVC: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
@IBOutlet weak var targetCadenceLabel: UILabel?
@IBOutlet weak var cadenceStepper: UIStepper?
@IBOutlet weak var goalPicker: UIPickerView?
var pickerDataSource = ["improve SPM", "maintain SPM"]
override func viewDidLoad() {
super.viewDidLoad()
self.goalPicker?.dataSource = self
self.goalPicker?.delegate = self
//MARK: Setup Tab Bar
let tabBarItem = self.tabBarItem
let incomingSelectedImage: UIImage! = UIImage(named: "settings_icon")?.withRenderingMode(.alwaysOriginal)
tabBarItem?.selectedImage = incomingSelectedImage
tabBarItem?.setTitleTextAttributes([NSForegroundColorAttributeName : UIColor(red: 60/255, green: 159/255, blue: 255/255, alpha: 1.0)], for: UIControlState.selected)
}
//MARK: - Delegates and data sources
//MARK: Data Sources
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return pickerDataSource.count
}
//MARK: Delegates
func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
let titleData = pickerDataSource[row]
let myFont = UIFont.systemFont(ofSize: 18)
let fontColor = UIColor(red: 60/255, green: 159/255, blue: 255/255, alpha: 1.0)
let myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName: myFont,NSForegroundColorAttributeName:fontColor])
return myTitle
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
}
@IBAction func cadenceStepper(_ sender: UIStepper) {
targetCadenceLabel?.text = Int(sender.value).description
}
@IBAction func goPremiumTapped(_ sender: UIButton) {
print("Go Premium Button Tapped")
}
}