iOS:Swift-プロパティオブザーバー
1818 ワード
class Man {
var name:String="lzh"
var age:Int=0{//
willSet{
print("super new \(newValue)")
}
didSet{
print("super new \(oldValue)")
}
}
var height:Double{
get{
print("super get")
return 10.0
}
set{
print("super set")
}
}
}
class SuperMan:Man{
//
override var name:String{
willSet{
print("newname \(newValue)")
}
didSet{
print("oldname \(oldValue)")
}
}
//
override var age:Int{
willSet{
print("child newage \(newValue)")
}
didSet{
print("child oldage \(oldValue)")
}
}
//
override var height:Double{
willSet{
print("child height \(newValue)")
}
didSet{
print("child height \(oldValue)")
}
}
}
var m = SuperMan()
m.name = "Hugo"
m.age = 18
m.height = 180
出力結果:
newname Hugo
oldname lzh
child newage 18
super new 18
super new 0
child oldage 0
super get
child height 180.0
super set
child height 10.0
Program ended with exit code: 0