import UIKit
//習慣上class名稱第一個字母大謝，屬性名稱第一個字母小寫
class Counter{
var count = 0;
//實體的method,只有實體才可以執行
func increment(){
count += 1;
}
func increment(by amount:Int){
count += amount;
}
func reset(){
count = 0;
}
}
let counter = Counter();
counter.increment();
print(counter.count);
counter.increment(by: 5);
print(counter.count);
counter.reset();
print(counter.count);
//使用self的時機
/*
struct Point{
var x = 0.0, y = 0.0;
func isToTheRightOf(x:Double) -> Bool {
return self.x > x;
}
}
let SomePoint = Point(x: 4.0, y: 5.0);
if SomePoint.isToTheRightOf(x: 1.0) {
print("比較大！");
}
*/
/*
struct Point{
var x = 0.0, y = 0.0;
//method要去改變store property的值時，必須加上mutating
mutating func moveBy(x deltaX:Double, y deltaY:Double){
x += deltaX
y += deltaY
}
}
*/
struct Point{
var x = 0.0, y = 0.0;
mutating func moveBy(x deltaX:Double, y deltaY:Double){
self = Point(x: x+deltaX, y: y+deltaY);
}
}
var somePoint = Point(x: 1.0, y: 1.0);
somePoint.moveBy(x: 2.0, y: 3.0);
enum TriStatsSwitch{
case off, low, heigh
mutating func next(){
switch self {
case .off:
self = .low;
case .low:
self = .heigh;
case .heigh:
self = .off;
}
}
}
var openLight = TriStatsSwitch.low;
openLight.next();
struct levelTracker{
static var highestUnlockedLevel = 1;
var currentLevel = 1;
static func unlock(_ level:Int){
if level > highestUnlockedLevel {
highestUnlockedLevel = level;
}
}
}
