一切正常，直到我选择第二个UIpickerView中的最后一项。 有小费吗？如果有缺少结尾括号只是添加一些我怀疑我留下任何，这里是代码。 Ps：对不起，如果看起来有点马虎
class RegisterViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
@IBOutlet weak var Country: UILabel!
@IBOutlet weak var pickerView1: UIPickerView! //this is pickerView for Country
@IBOutlet weak var Ethnicity: UILabel! //this is pickerView for Ethnicity
@IBOutlet weak var pickerView2: UIPickerView!
//country constant
let country = ["United States", "China", "Japan", "Germany", "France", "United Kingdom", "Italy", "Brazil", "Canada", "Spain", "Australia", "Sweden", "Mexico", "Russia", "Turkey", "New Zealand", "Ireland", "India", "Jamica", "Puerto Rico", "Hong Kong", "Russia"]
//ethnicity constant
let ethnicity = ["Black", "Causion", "Pacific Islander", "Indian", "Native American", "Middle Eastern", "Asian", "Russian", "Hispanic", "Irish", "German", "Jewish", "Mixed Race", "Other"]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
if pickerView1 == pickerView1 {
return 1
} else if pickerView2 == pickerView2 {
return 1
}
return 1
}
func pickerView(_ _pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if (pickerView1 == pickerView1){
return country.count
}else if (pickerView2 == pickerView2){
return ethnicity.count
}
return 1
}
这看起来像问题区号。 Xcode调试带我到这里
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if (pickerView == pickerView1){
return country[row]
}else if (pickerView == pickerView2){
return ethnicity[row]
}
return ("")
}
//view did load
override func viewDidLoad() {
super.viewDidLoad()
self.pickerView1.isHidden = false
self.pickerView2.isHidden = false
}