ios - NSNotification 不适用于 Swift 翻译(来自 Objective-C)

Question

将我的 Objective-C 代码转换为 Swift 后，我​​无法让我的 NSNotifications 工作。在网上搜索了一个小时后，我终于放弃了。考虑以下示例:

func getToUrl(url:String, timeoutInterval:Float) -> Bool {

    println("Starting HTTP GET to: \(url)")

    // Fire a notification
    NSNotificationCenter.defaultCenter().postNotificationName("StartNotification", object: self)

    [...]

}

func getJsonFromServer() {

    // Add an observer which should fire the method test when desired
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "test:", name: "StartNotification", object: self)

    // Calls the function 
    getToUrl("http://www.stackoverflow.com", timeoutInterval: 10)

}

func test(sender: AnyObject) {
    println("I am here!")
}

我找不到错误，如果有人能找到，我将不胜感激!

代码运行，但从未调用测试方法。

Answer 1

将 self 更改为 nil(以便听到所有对象)

func getJsonFromServer() {

// Add an observer which should fire the method test when desired
NSNotificationCenter.defaultCenter().addObserver(self, selector: "test:", name:   "StartNotification", object: nil)

// Calls the function 
getToUrl("http://www.stackoverflow.com", timeoutInterval: 10)

 }