Swift 2无法使用类型的参数列表调用'FSEventStreamCreate'

本文介绍了Swift 2无法使用类型的参数列表调用'FSEventStreamCreate'的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

使用Swift 2和Xcode 7 beta 2（Build：7A121l）我使用FSEventStream API和@convention（c）得到了这个编译错误。

Using Swift 2 and Xcode 7 beta 2 (Build: 7A121l) I get this compile error using FSEventStream API and @convention(c).

任何建议都是太棒了，谢谢！

Any advice would be awesome, thanks!

internal class FileSystem { init () { let allocator: CFAllocator? = kCFAllocatorDefault // Create FSEventStream and return valid FSEventStreamRef // Alias FSEventStreamCallback - CFunction typealias FSEventStreamCallback = @convention(c) (ConstFSEventStreamRef, UnsafeMutablePointer<Void>, UInt, UnsafeMutablePointer<Void>, UnsafePointer<FSEventStreamEventFlags>, UnsafePointer<FSEventStreamEventId>) -> Void let callback: FSEventStreamCallback = { (streamRef, clientCallBackInfo, numEvents, eventPaths, eventFlags, eventIds) -> Void in print ("changed") // handle file event } let context: UnsafeMutablePointer<FSEventStreamContext> = nil let pathsToWatch: CFArray = [NSHomeDirectory() + "/Dir"] let sinceWhen: FSEventStreamEventId = UInt64(kFSEventStreamEventIdSinceNow) let latency: CFTimeInterval = 1.0 let flags: FSEventStreamCreateFlags = UInt32(kFSEventStreamCreateFlagNone) let eventStream = FSEventStreamCreate( allocator, callback, context, pathsToWatch, sinceWhen, latency, flags ) FSEventStreamScheduleWithRunLoop(eventStream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode) FSEventStreamStart(eventStream) } }

推荐答案

你使用的是错误的签名（UInt不是Int）：

You are using the wrong signature (UInt not Int):

typealias FSEventStreamCallback = @convention(c) (ConstFSEventStreamRef, UnsafeMutablePointer<Void>, Int, UnsafeMutablePointer<Void>, UnsafePointer<FSEventStreamEventFlags>, UnsafePointer<FSEventStreamEventId>) -> Void

这个编译罚款：

init () { let allocator: CFAllocator? = kCFAllocatorDefault // Create FSEventStream and return valid FSEventStreamRef // Alias FSEventStreamCallback - CFunction typealias FSEventStreamCallback = @convention(c) (ConstFSEventStreamRef, UnsafeMutablePointer<Void>, Int, UnsafeMutablePointer<Void>, UnsafePointer<FSEventStreamEventFlags>, UnsafePointer<FSEventStreamEventId>) -> Void let callback: FSEventStreamCallback = { (streamRef, clientCallBackInfo, numEvents, eventPaths, eventFlags, eventIds) -> Void in print ("changed") // handle file event } let context: UnsafeMutablePointer<FSEventStreamContext> = nil let pathsToWatch: CFArray = [NSHomeDirectory() + "/Dir"] let sinceWhen: FSEventStreamEventId = UInt64(kFSEventStreamEventIdSinceNow) let latency: CFTimeInterval = 1.0 let flags: FSEventStreamCreateFlags = UInt32(kFSEventStreamCreateFlagNone) let eventStream = FSEventStreamCreate( allocator, callback, context, pathsToWatch, sinceWhen, latency, flags ) FSEventStreamScheduleWithRunLoop(eventStream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode) FSEventStreamStart(eventStream) }