Question

当罢工达到3时，我似乎无法写下if语句以使出局上升？当有人击中3次罢工时，有人可以租借帮助并迅速实现这一目标

//
//  ViewController.swift
//  helloWordDemo
//
//  Created by Developer on 6/8/14.
//  Copyright (c) 2014 AECApps. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
@IBOutlet var labelDispaly : UILabel = nil
// dispaly Strikes

var counter = 1

@IBAction func buttonPressed(sender : AnyObject) {

    labelDispaly.text = "Strikes \(counter++)"
}
//button to add strikes

@IBOutlet var OutsDispaly : UILabel = nil

var outsCounter = 1
//outs dispaly

@IBAction func outsButtonPressed(sender : AnyObject) {

    OutsDispaly.text = "Outs \(outsCounter++)"

}
//button to add outs
if counter = 3 {
    outsCounter ++
   }
}

Answer 1

使用属性观察者：

var counter = 1 {
didSet {
    if counter == 3 {
        self.outsCounter++
    }
}
}

每当计数器发生变化时，都会调用didSet。

（另请注意，等于运算符为==。=用于分配。）

Swift Xcode 6棒球计数器

1 个答案: