Swift var 添加不起作用

Question

我有多个变量

现在我希望我的 var totalScore = 我添加的其他 var

这是我的代码

var section1score: Int = 0
var section2score: Int = 0
var section3score: Int = 0
var totalScore: Int = section1score + section2score + section3score

此代码无效...在 var totalScore 中它告诉我 ViewController 没有名为 section1Score 的成员...并停在那里

我做错了什么？

谢谢！

Answer 1

您可以将 totalScore 写成计算的属性，这样它将始终是其他 3 个属性的总和。

var totalScore: Int {
    get {
        return section1score + section2score + section3score
    }
}

Answer 2

这段代码在函数中吗？在 init() 完成之前，您不能实例化变量。所以如果他们在一个函数中，这应该可以工作。

func test() {
    var section1score: Int = 0
    var section2score: Int = 0
    var section3score: Int = 0
    var totalScore: Int = section1score + section2score + section3score
}

或者如果它们需要是实例变量：

var section1score: Int = 0
var section2score: Int = 0
var section3score: Int = 0
var totalScore: Int = 0

init() {
    totalScore = section1score + section2score + section3score
}

Answer 3

试试这个

var section1score: Int!
var section2score: Int!
var section3score: Int!
var totalScore: Int!

 override func viewDidLoad() {
    super.viewDidLoad()
    section1score = 0
    section2score = 0
    section3score = 0

    totalScore = section1score + section2score + section3score
    println(totalScore)
 }

Swift var 添加不起作用

Swift var addition does not work

var

addition

ios

swift