NSURLProtocol SWIFT error

Question

我正试图在我的应用程序中实现一个NSURLProtocol，它将从myApp://...

开始获取url

我在一个新的SWIFT文件中创建了协议，并在AppDelegate中实现:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
    NSURLProtocol.registerClass(myURLProtocol)
    return true
} 

但是我一直得到这个错误。我不知道如何定义canInitWithRequest到我的webViews..

SubViewTest[6628:156910] * WebKit丢弃类中未捕获的异常webView: decidePolicyForNavigationAction:要求:框架:decisionListener:delegate: * -canInitWithRequest: only为抽象类定义。定义- [_TtC11SubViewTest13myURLProtocolcanInitWithRequest:] !

Answer 1

在你得到的例外中注意到，myURLProtocol类应该实现canInitWithRequest类函数/方法;确切地说，它应该覆盖基类的抽象方法。

下面是头文件中NSURLProtocol的canInitWithRequest方法的注释描述:

/*!
@method canInitWithRequest:
@abstract This method determines whether this protocol can handle
the given request.
@discussion A concrete subclass should inspect the given request and
determine whether or not the implementation can perform a load with
that request. This is an abstract method. Sublasses must provide an
implementation. The implementation in this class calls
NSRequestConcreteImplementation.
@param request A request to inspect.
@result YES if the protocol can handle the given request, NO if not.
*/

所以，答案是:将代码添加到您的myURLProtocol类:

class func canInitWithRequest(request: NSURLRequest!) -> Bool {
    return true;
}

备注:您可能需要在返回true或false之前检查请求对象，只是不要忘记添加此代码:)