不同于结构体和枚举类型，继承是类特有的。
语法：
class MyClass:Superclass{ //MyClass:子类 Superclass：父类
//类的定义
}
EG:
@H_404_51@class Animal {
@H_404_51@var eyes :Int
@H_404_51@var month :Int
@H_404_51@var nose :Int
@H_404_51@var voice :String
@H_404_51@init(){
eyes =2
month =1
nose =1
voice ="voice"
}
@H_404_51@func description() ->String {
@H_404_51@return"\(eyes) eyes ; up to\(month) month"
}
}
@H_404_51@class Cat: Animal {
overrideinit() { //重写init()
@H_404_51@super.@H_404_51@init()
voice ="miao"
}
}
@H_404_51@var cat = Cat()
print(cat.@H_229_301@voice) //"miao\n"
2.重写属性
@H_404_51@class Animal {
@H_404_51@var eyes :Int
@H_404_51@var month :Int
@H_404_51@var nose :Int
@H_404_51@var voice :String
@H_404_51@init(){
eyes =0
month =0
nose =0
voice ="voice"
}
@H_404_51@func description() ->String {
@H_404_51@return"\(eyes) eyes ; up to\(month) month"
}
}
@H_404_51@class Cat: Animal {
overrideinit() {
@H_404_51@super.@H_404_51@init()
voice ="miao"
}
@H_404_51@override@H_404_51@var eyes: Int{
@H_404_51@get{
@H_404_51@return@H_404_51@super.eyes
}
@H_404_51@set{
@H_404_51@super.eyes =max(newValue,100)
}
}
}
@H_404_51@var cat = Cat()
print(cat.voice)
cat.eyes =1000
print(cat.eyes)
若不想被继承，可在前面加final.
原文链接：https://www.f2er.com/swift/323956.html