objective-c - 带参数的完成 block

Question

我在 nsobject 类中编写了一个带有完成块的方法，并从 uiviewcontroller 调用了这个方法，它工作得很好，但是我如何在这个方法中传递一个 nsstring 参数，以下是我的代码。

-(void)testingFunction:(void(^)(NSMutableArray* result))handler{
    NSMutableArray *dataArray = [[NSMutableArray alloc] init];
    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlstring]];
    NSString *authStr = @"";
    NSData *authData = [authStr dataUsingEncoding:NSUTF8StringEncoding];
    NSString *authValue = [NSString stringWithFormat: @"Basic %@",[authData base64EncodedStringWithOptions:0]];
    [request setValue:authValue forHTTPHeaderField:@"Authorization"];

    //create the task
    NSURLSessionDataTask* task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
    [dataArray addObject:[[json objectForKey:@"query"] objectForKey:@"geosearch"]];
    dispatch_async(dispatch_get_main_queue(), ^{
        handler(dataArray) ;
      });
    }];
    [task resume];
}

并从我的 uiviewcontroller 调用此方法

[[AllFunction sharedInstance] testingFunction:^(NSMutableArray* testResult){
    [somearray addObject:testResult];
    NSLog(@"Result was %@", somearray);
    [self.tableView reloadData];
}];

Answer 1

如果你想通过一个 NSString*方法:

-(void)testingFunction:(void(^)(NSMutableArray* result))handler andString:(NSString*) yourString;

或者，如果您想通过 NSString*到完成块:

-(void)testingFunction:(void(^)(NSMutableArray* result, NSString* yourString))handler;

编辑:

您可以像这样调用该方法:

NSString* yourString = @"Some Text";
testingFunction:^(NSMutableArray* result) {
    //Do whatever you want here
} andString:yourString;

去读这个: http://www.tutorialspoint.com/objective_c/objective_c_functions.htm

编辑2:

正如 trojanfoe 所说，如果你的字符串应该是一个 url，你应该使用 NSURL而不是 NSString