Swift 2：结构上的变异方法在闭包内部不起作用

Question

我正在尝试从闭包中对我的一个结构调用变异方法。没用。

我正在安排从 dispatch_after 调用闭包。我收到错误消息 Partial application of 'mutating' method is not allowed.

这在 Swift 1.2 中有效。 Not in Swift 2.更新后出现错误。这是一个独立示例，将在 Playground 中显示错误。

struct MutationTest {

    var timestamp: Int = 0

    mutating func changeTimestamp () {
        timestamp += 1 //NO ERROR HERE
    }

    mutating func callChangeTimeStamp() {
        changeTimestamp() //NO ERROR HERE
    }

    mutating func scheduleCallChangeTimestamp() {
        let highQConstant = DISPATCH_QUEUE_PRIORITY_HIGH
        let highQ = dispatch_get_global_queue(highQConstant, 0)
        let time = dispatch_time(DISPATCH_TIME_NOW, Int64(3 * NSEC_PER_SEC))
        dispatch_after(time, highQ, callChangeTimeStamp) //ERROR HERE
    }

}

顺便说一句，如果我将 changeTimestamp 方法更改为：

，我会得到完全相同的错误

    mutating func changeTimestamp () {
        self = MutationTest(timestamp: timestamp + 1)
    }

Answer 1

这似乎工作正常：

dispatch_after(time, highQ, { self.callChangeTimeStamp() })

Swift 2：结构上的变异方法在闭包内部不起作用

Swift 2: mutating method on struct not working from inside closure

struct

grand-central-dispatch

swift2

mutating-function