无法转换(计时器！)->无效到((CFRunLoopTimer?)->无效)！- 将 NSTimer 扩展转换为 Swift 3 [英] Cannot convert (Timer!) -> Void to ((CFRunLoopTimer?) ->Void)! - Converting NSTimer extension to Swift 3

问题描述

我正在尝试将我在我的项目中使用的 Pod 转换为 Swift 3.它不是我写的，但原作者没有更新它，所以我把它分叉了，我试图自己做.但是...

I am trying to convert a Pod I am using in my project to Swift 3. I didn't write it, but the original author has not updated it so I forked it any I'm trying to do it myself. But...

我在尝试将扩展到 NSTimer 转换为 Swift 3 时遇到此错误:无法转换类型'(Timer!) -> 的值Void' 到预期的参数类型 '((CFRunLoopTimer?) -> Void)!

I get this error trying to convert an extension to NSTimer to Swift 3: Cannot convert value of type '(Timer!) -> Void' to expected argument type '((CFRunLoopTimer?) -> Void)!

似乎是 Swift 3 处理程序类型，(Timer!) ->Void 与旧式 CFRunLoop 样式处理程序不兼容，但我不确定如何在保持与 iOS 9 兼容的同时进行转换.

It seems that the Swift 3 handler type, (Timer!) -> Void is not compatible with the old school CFRunLoop style handlers, but I am not sure how to convert this over while maintaining compatibility with iOS 9.

我正在粘贴以下代码，由 Xcode 转换.您可以在 https://github.com/找到原始代码entotsu/TKSubmitTransition/blob/master/SubmitTransition/Classes/NSTimerEx.swift

I am pasting the code below, as converted by Xcode. You can find the original code at https://github.com/entotsu/TKSubmitTransition/blob/master/SubmitTransition/Classes/NSTimerEx.swift

干杯

import Foundation
extension Timer {
    class func schedule(delay delay: TimeInterval, handler: (Timer!) -> Void) -> NSTimer {
        let fireDate = delay + CFAbsoluteTimeGetCurrent()
        let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, 0, 0, 0, handler) // Error on this line
        CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes)
        return timer
    }

    class func schedule(repeatInterval interval: TimeInterval, handler: @escaping (Timer!) -> Void) -> Timer {
        let fireDate = interval + CFAbsoluteTimeGetCurrent()
        let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, interval, 0, 0, handler) // And this line
        CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes)
        return timer
    }
}

推荐答案

试试这个:

extension Timer {
    class func schedule(delay: TimeInterval, handler: ((Timer?) -> Void)!) -> Timer! {
        let fireDate = delay + CFAbsoluteTimeGetCurrent()
        let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, 0, 0, 0, handler)
        CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, .commonModes)
        return timer
    }
    class func schedule(repeatInterval interval: TimeInterval, handler: ((Timer?) -> Void)!) -> Timer! {
        let fireDate = interval + CFAbsoluteTimeGetCurrent()
        let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, interval, 0, 0, handler)
        CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, .commonModes)
        return timer
    }
}

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