Question

我有以下内容：

    let processURLS = processingViewController()
    Timer.scheduledTimer(timeInterval: 1,
                         target: self,
                         selector: #selector(processURLS.getURLsToSend),
                         userInfo: nil,
                         repeats: true)

当触发此事件时，我收到以下错误，我不确定为什么这不起作用

2016-11-09 14：47：00.504932 AcumenJLR [3414：905978] *终止应用由于未捕获的异常'NSInvalidArgumentException'，原因： ' - [AcumenJLR.homeViewController getURLsToSend]：无法识别的选择器发送到实例0x100d25c60' * 第一次抛出调用堆栈：（0x1816721c0 0x1800ac55c 0x181679278 0x181676278 0x18157059c 0x18215c8f8 0x1816208f4 0x181620608 0x18161fec4 0x18161dac0 0x18154c048 0x182fd2198 0x1875372fc 0x187532034 0x100114620 0x1805305b8）libc ++ abi.dylib：终止于 NSException类型的未捕获异常

这是getURLsToSend方法

func getURLsToSend () {
    //create a fetch request, telling it about the entity
    let fetchRequest: NSFetchRequest<URLsToSend> = URLsToSend.fetchRequest()
    let context = getContext()
    do {
        //Get results
        let searchResults = try getContext().fetch(fetchRequest)
        print ("num of results = \(searchResults.count)")

        //You need to convert to NSManagedObject to use 'for' loops
        for urls in searchResults as [NSManagedObject] {
            //get the Key Value pairs (although there may be a better way to do that...
            //print("\(urls.value(forKey: "url"))")
            let currentURL = urls.value(forKey: "url")!
            //print(urls.value(forKey: "url")!)

            completeLoadAction(urlString: currentURL as! String) { code in
                if (code == 200){
                    context.delete(urls)
                }
            }

        }
    } catch {
        print("Error with request: \(error)")
    }

Answer 1

根据目标/行动模式，selector中指定的方法必须在target中指定的类中声明，在本例中为当前类self。

更改target或在self中实施该方法。

Answer 2

你可能在方法上有一些参数，但你没有从那里发送任何价值

斯威夫特3次定时赛

2 个答案: