ios - Swift - 如何检查数组中是否存在具有某些属性的元素？

Question

在我的 NookController 中，我有以下内容:

    var nooks = [NookController(name:"Library",coordinate:CLLocationCoordinate2D(),availability:.Empty, hours: "Open 24 hours"),
            NookController(name:"Math Building",coordinate:CLLocationCoordinate2D(),availability:.Empty, hours: "Open 24 hours")]

在我的 ViewController 中，我创建了以下函数来验证我附加的新“Nook”是否重复:

func checkDuplicates() -> Bool {
        if nooks.contains(NookController(name:"Library",coordinate:CLLocationCoordinate2D(),availability:.Empty,hours:"Open 24 hours")) {
            return true
        }
        else {
            return false
    }
}

但是，我正在测试这个，当我实际上将一个元素添加到该数组中已经存在的数组时(它总是返回 false)，它不起作用。

Answer 1

重写 NookController 类的等于运算符:

func == (left: NookController, right: NookController) -> Bool {
    return left.name == right.name
}

然后这样使用它:

func checkDuplicates() -> Bool {
    let nook = NookController(name:"Library",coordinate:CLLocationCoordinate2D(),availability:.Empty,hours:"Open 24 hours")
    return nooks.contains(nook)
}