委托Swift的Objective-C协议 [英] Delegating Objective-C Protocol on Swift

问题描述

为此，我正在中继 CocoaAsyncSocket 项目。

我成功地使用Bridging-Header.h导入CocoaAsyncSocket库我可以从Objective-C类调用函数，但是我无法在swift上写代理函数。

这是我设置的代码Socket并将ViewController.swif定义为监听器的委托类：

  func setupSocket（）{
 var udpSocket ：GCDAsyncUdpSocket = GCDAsyncUdpSocket（delegate：self，delegateQueue：dispatch_get_main_queue（））
 var error：NSError？ 
 let port：UInt16 = 12121 
 let address：String =228.5.12.12
 udpSocket.bindToPort（port，error：& error）
 udpSocket.joinMulticastGroup（address，错误：& error）
 udpSocket.enableBroadcast（true，error：& error）
 println（228.5.12.12）
} 
  

这是Objective-C中的前委托函数：

   - （void）udpSocket：（GCDAsyncUdpSocket *）sock didReceiveData：（NSData *）data 
 fromAddress：（NSData *）address 
 withFilterContext：（id）filterContext; 
  

最后，这是我如何在Swift上实现这个功能：

 覆盖func udpSocket（sock：GCDAsyncUdpSocket !, didReceiveData data：NSData !, fromAddress address：NSData !, withFilterContext filterContext：AnyObject！）{
 println（data）
} 
  

声明ViewController类来实现正确的协议： p>

  class ViewController：UIViewController，GCDAsyncUdpSocketDelegate {
 ... 
} 
  

除了覆盖之外，我没有编译错误。

问题：

解决方案

覆盖关键字用于覆盖超类的方法。由于您不会覆盖任何方法，因此不需要覆盖关键字。

I'm implementing an UDP Listener on iOS using the Swift language.

For this I'm relaying on the CocoaAsyncSocket project.

I was succeeded on importing the CocoaAsyncSocket library using a Bridging-Header.h, I could call the functions from the Objective-C classes, but I'm not able to write the delegate function on swift.

This is the code where I set the Socket and define the ViewController.swif as the delegate class for the listener:

func setupSocket() {
    var udpSocket : GCDAsyncUdpSocket = GCDAsyncUdpSocket(delegate: self, delegateQueue: dispatch_get_main_queue())
    var error : NSError?
    let port : UInt16 = 12121
    let address : String = "228.5.12.12"
    udpSocket.bindToPort(port, error: &error)
    udpSocket.joinMulticastGroup(address, error: &error)
    udpSocket.enableBroadcast(true, error: &error)
    println("228.5.12.12")
}

This is the former delegate function in Objective-C:

- (void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data
                                               fromAddress:(NSData *)address
                                         withFilterContext:(id)filterContext;

And finally, this is how I'm implementing the function on Swift:

override func udpSocket(sock : GCDAsyncUdpSocket!, didReceiveData data : NSData!,  fromAddress address : NSData!,  withFilterContext filterContext : AnyObject!) {
    println(data)
}

ViewController class is declared to implement the right protocol:

class ViewController: UIViewController, GCDAsyncUdpSocketDelegate {
    ...
}

I got no compile error except for the override.

Question: What am I doing wrong?

解决方案

override keyword is for overriding methods of superclass. As you are not overriding any methods, override keyword is not needed.

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