Swift里的类继承，构造和析构代码
敲敲打打， 每天差不多一个小时来学这个， 相信到时候再用XCODE，感觉会熟悉很多。。 class Counter { var count = 0 func increment() { count += 1 } func increment(by amount: Int) { count += amount } func reset() { count = 0 } } let counter = Counter() counter.increment() print(counter.count) print(counter.increment(by: 5)) print(counter.reset()) class Vehicle { var currentSpeed = 0.0 var description: String { return "traveling at \(currentSpeed) miles per hour" } func makeNoise() { //nothing } } class Bicycle: Vehicle { var hasBasket = ...
