以下pickerView:attributedTitleForRow:forComponent:方法实现应为您提供帮助：
func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
let attributedString = NSAttributedString(string: "some string", attributes: [NSForegroundColorAttributeName : UIColor.redColor()])
return attributedString
}
如果要attributedString在多个if或switch语句中使用，下面的UIViewControllersubClass示例将为您提供帮助：
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
@IBOutlet weak var picker: UIPickerView!
let arrayOne = ["One", "Two", "Three", "Four", "Five", "Six"]
let arrayTwo = ["Un", "Deux", "Trois", "Quatre", "Cinq", "Six"]
let arrayThree = [1, 2, 3, 4, 5, 6]
override func viewDidLoad() {
super.viewDidLoad()
picker.delegate = self
picker.dataSource = self
}
func numberOfComponentsInPickerView(_: UIPickerView) -> Int {
return 3
}
func pickerView(_: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
switch component {
case 0:
return arrayOne.count
case 1:
return arrayTwo.count
case 2:
return arrayThree.count
default:
return NSNotFound
}
}
func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
var attributedString: NSAttributedString!
switch component {
case 0:
attributedString = NSAttributedString(string: arrayOne[row], attributes: [NSForegroundColorAttributeName : UIColor.redColor()])
case 1:
attributedString = NSAttributedString(string: arrayTwo[row], attributes: [NSForegroundColorAttributeName : UIColor.redColor()])
case 2:
attributedString = NSAttributedString(string: toString(arrayThree[row]), attributes: [NSForegroundColorAttributeName : UIColor.redColor()])
default:
attributedString = nil
}
return attributedString
}
func pickerView(_: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
switch component {
case 0:
println(arrayOne[row])
case 1:
println(arrayTwo[row])
case 2:
println(arrayThree[row])
default:
break
}
}
}
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