我有一个应用程序向我的服务器发出签名请求。所有请求都需要身份验证令牌。每当我发出请求时，如果未找到身份验证令牌，我会使用 NSInvocation 存储该请求，查询身份验证令牌，调用我的调用，然后返回带有完成块的原始调用方法。
我的问题是，如何正确地将返回块传递给 NSInvocation？我没有错误，但由于某种原因，[someClass listFilesWithCompletionBlock] 的完成块的原始调用者永远不会触发。
...
[someClass listFilesWithCompletionBlock:^(id response, id error){
onCompletion(response, error); // <-- never returns here
}];
...
// someClass
// method that is called if token was valid
- (void) someMethodWithCompletionBlock:(void(^)(id response, id error))onCompletion{
// do the work that lists all of the files from server
onCompletion(response, error);
}
// if token was valid, call someMethod, if not then set the invocation, then call fetch token
- (void) listFilesWithCompletionBlock:(void(^)(id response, id error))onCompletion{
onCompletion(response, error){
if(token){
[self someMethodWithCompletionBlock:^(id response, id error){
onCompletion(response, error);
}];
}else{
void (^blockName)(id, id) = ^void (id response, id error){
NSLog(@"block!");
};
SEL selector = @selector(listFilesWithCompletionBlock:);
NSMethodSignature *signature = [self methodSignatureForSelector:selector];
self.invocation = [NSInvocation invocationWithMethodSignature:signature];
[self.invocation setTarget:self];
[self.invocation setSelector:selector];
[self.invocation setArgument:&blockName atIndex:2];
[self fetchToken];
}
}
// fetches token, then invokes
- (void) fetchToken{
[anotherClass fetchTokenWithCompletionBlock:^(NSString *responseToken, id error) {
if(responseToken){
// we got the token
// invoke any methods here
// should call listFiles with valid token then calls someMethod
[self.invocation invoke];
}
}];