Swift:如何将闭包作为函数参数传入 [英] Swift: How to pass in a closure as a function argument

问题描述

我试图找出将闭包(完成处理程序)作为参数传递给另一个函数的语法.

I'm trying to figure out the syntax for passing in a closure (completion handler) as an argument to another function.

我的两个功能是:

func responseHandler(response: NSURLResponse!, data: NSData!, error: NSError!) -> Void {
    var err: NSError


    var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
    println("AsSynchronous\(jsonResult)")

}

查询功能

public func queryAllFlightsWithClosure( ) {

    queryType = .AllFlightsQuery
    let urlPath = "/api/v1/flightplan/"
    let urlString : String = "http://\(self.host):\(self.port)\(urlPath)"
    var url : NSURL = NSURL(string: urlString)!
    var request : NSURLRequest = NSURLRequest(URL: url)

        NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue(), completionHandler:responseHandler)

}

我想将查询修改为:

public fund queryAllFlightsWithClosure( <CLOSURE>) {

这样我就可以从外部将闭包传递给函数.我知道有一些对训练闭包的支持，但我不确定这是否也是可行的方法.我似乎无法正确使用语法...

so that I can externally pass the closure into the function. I know there is some support for training closures but I"m not sure if thats the way to go either. I can't seem to get the syntax correct...

我试过了:

public func queryAllFlightsWithClosure(completionHandler : {(response: NSURLResponse!, data: NSData!, error: NSError!) -> Void} ) {

但它一直给我一个错误

推荐答案

OOPS nevermind...

OOPS nevermind...

public func queryAllFlightsWithClosure(completionHandler : (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void ) {

取出 {} 似乎可以工作?

took out the {} and it seems to work?

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