このページは「Nilかもしれないプロパティ」のサンプルコードです。
import UIKit
class Tour{
let name:String
var bass:Musician?
var drums:Musician?
init(name:String){
self.name = name
}
func reportMember()->String{
var message = ""
if(bass == nil){
message = "ベースは決まっていません。"
}else{
message = "ベースは\((bass!).name)さん。"
}
if(drums == nil){
message += "ドラムは決まっていません。"
}else{
message += "ドラムは\((drums!).name)さん。"
}
return message + "\n"
}
}
class Musician{
let name:String
var part:String
init(name:String, part:String){
self.name = name
self.part = part
}
}
class ViewController: UIViewController {
@IBOutlet weak var resultText: UITextView!
override func viewDidLoad() {
super.viewDidLoad()
var myStr = ""
let us2014 = Tour(name:"2014アメリカ横断スーパーツアー")
us2014.bass = Musician(name:"トニー", part:"ベース")
us2014.drums = Musician(name:"ビル", part:"ドラム")
myStr = us2014.reportMember()
resultText.text = myStr
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}