关于sendsynchronousRequest:returningResponse:error:已弃用的警告：在ios 9中首次发布-

它说

使用[nsursession sharedsession]dataTaskwithRequest:request completionHandler::

下面是我的代码：

 NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

我将上述代码更改为：

 NSData *returnData = [[NSURLSession  sharedSession] dataTaskWithRequest:request completionHandler:nil];

我得到两个警告：

传递给需要非Null参数的被调用方的Null

使用“NSURLSession”类型的表达式初始化“NSData”的指针类型不完整

帮帮我。请用有助于理解的代码解释我。我是新手

我的实际代码：

   -(void)getdata {

    NSString *userName = @“user@yahoo”;
    NSString *password = @“passr”;
    NSData *plainData = [password dataUsingEncoding:NSUTF8StringEncoding];
    NSString *base64String = [plainData base64EncodedStringWithOptions:0];
    base64String=[self sha256HashFor: base64String];

    NSString *urlString = @"https://api.eaxmpleurl/files";

    NSMutableURLRequest *request= [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"GET"];



    NSString *authStr = [NSString stringWithFormat:@"%@:%@", userName, base64String];
    NSData *authData = [authStr dataUsingEncoding:NSUTF8StringEncoding];


    NSString *authValue = [NSString stringWithFormat:@"Basic %@", [authData base64EncodedStringWithOptions:0]];

       [request setValue:authValue forHTTPHeaderField:@"Authorization"];










    NSURLSessionDataTask *dataTask = [[NSURLSession sharedSession]
                                      dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
    {
        // Use the data here







        NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];


        NSError * error1;

        self->arrayPDFName = [[NSMutableArray alloc]init];
        NSDictionary *jsonResults = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];


        NSDictionary *dictOriginal = jsonResults[@"dark”];
    [titleArray addObject:[NSString stringWithFormat:@" Dark(%@)”, dictOriginal[@"count"]]];


    NSDictionary *dictOriginal2 = jsonResults[@"opey”];
    [titleArray addObject:[NSString stringWithFormat:@" Opey(%@)”, dictOriginal2[@"count"]]];



    NSDictionary *dictOriginal3 = jsonResults[@"pef”];
    [titleArray addObject:[NSString stringWithFormat:@" Pef(%@)”, dictOriginal3[@"count"]]];


    NSDictionary *dictOriginal4 = jsonResults[@"sdf”];
    [titleArray addObject:[NSString stringWithFormat:@" Sdf(%@)”, dictOriginal4[@"count"]]];


        NSArray *arrayFiles = [NSArray arrayWithObjects: dictOriginal, dictOriginal2, dictOriginal3, dictOriginal4, nil];


        NSLog(@"str: %@", titleArray);


        for (NSDictionary *dict in arrayFiles) {
            NSMutableArray *arr = [NSMutableArray array];

            NSArray *a = dict[@"files"];
            for(int i=0; i < a.count; i ++) {


                NSString *strName = [NSString stringWithFormat:@"%@",[[dict[@"files"] objectAtIndex:i] valueForKey:@"name"]];
                // NSLog(@"str: %@", strName);
                [arr addObject:strName];
            }
            [arrayPDFName addObject:arr];
        }











                NSString *errorDesc;
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory1 = [paths objectAtIndex:0];
        NSString *plistPath = [documentsDirectory1 stringByAppendingPathComponent:@"SampleData.plist"];


        NSString *error2;


        data  = [ NSPropertyListSerialization dataWithPropertyList:jsonResults format:NSPropertyListXMLFormat_v1_0 options:0 error:&error];


        if(data ) {
            if ([data  writeToFile:plistPath atomically:YES]) {
                NSLog(@"Data successfully saved.");
            }else {
                NSLog(@"Did not managed to save NSData.");
            }
        }
        else {
            NSLog(@"%@",errorDesc);
        }



        NSDictionary *stringsDictionary = [NSDictionary dictionaryWithContentsOfFile:plistPath];




#pragma unused (stringsDictionary)
#pragma unused (error1)

#pragma unused (str)








    }];

    // Starting the task
    [dataTask resume];




}

-（void）获取数据{
NSString*用户名=@“user@yahoo”;
NSString*密码=@“passr”；
NSData*plainData=[密码数据使用编码：NSUTF8StringEncoding]；
NSString*base64String=[plainData base64EncodedStringWithOptions:0]；
base64String=[self-sha256HashFor:base64String]；
NSString*urlString=@”https://api.eaxmpleurl/files";
NSMutableURLRequest*请求=[[NSMutableURLRequest alloc]init]；
[请求设置URL:[NSURL URLWithString:urlString]]；
[请求设置HttpMethod:@“获取”]；
NSString*authStr=[NSString stringWithFormat:@“%@:%@”，用户名，base64String]；
NSData*authData=[authStr dataUsingEncoding:NSUTF8StringEncoding]；
NSString*authValue=[NSString stringWithFormat:@“Basic%@，[authData base64EncodedStringWithOptions:0]]；
[请求设置值：HttpHeaderField的authValue:@“授权”]；
NSURLSessionDataTask*dataTask=[[NSURLSession sharedSession]
dataTaskWithRequest:请求完成处理程序：^（NSData*数据，NSURLRRESPONSE*响应，NSError*错误）
{
//使用这里的数据
NSString*str=[[NSString alloc]initWithData:数据编码：NSUTF8StringEncoding]；
n错误*错误1；
self->arrayPDFName=[[NSMutableArray alloc]init]；
NSDictionary*jsonResults=[NSJSONSerialization JSONObjectWithData:数据选项：NSJSONReadingMutableContainers错误：nil]；
NSDictionary*dictOriginal=jsonResults[@“暗”]；
[titleArray addObject:[NSString stringWithFormat:@“深色（%@）”，dictOriginal[@“计数”]]；
NSDictionary*dictOriginal2=jsonResults[@“opey”]；
[titleArray addObject:[NSString stringWithFormat:@“Opey（%@）”，dictOriginal2[@“count”]]；
NSDictionary*dictOriginal3=jsonResults[@“pef”]；
[titleArray addObject:[NSString stringWithFormat:@“Pef（%@）”，dictOriginal3[@“count”]]；
NSDictionary*dictOriginal4=jsonResults[@“sdf”]；
[titleArray addObject:[NSString stringWithFormat:@“Sdf（%@）”，dictOriginal4[@“count”]]；
NSArray*arrayFiles=[NSArray数组及其对象：dictOriginal、dictOriginal2、dictOriginal3、dictOriginal4、nil]；
NSLog（@“str:%@”，titleArray）；
for（NSDictionary*以数组文件形式记录）{
NSMUTABLEARRY*arr=[NSMUTABLEARRY]；
NSArray*a=dict[@“文件”]；
for（int i=0；i

您需要使用以下方法：

// Creating a data task
NSURLSessionDataTask *dataTask = [[NSURLSession sharedSession]
  dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
{
  // Use the data here
}];

// Starting the task
[dataTask resume];

---

请查看更多详细信息。

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dataTaskWithRequest:completionHandler

的文档？请参阅我的upadte，实际数据就是这样。我需要如何在那里插入您的代码。请在代码中解释。我是新的bie@jj1：此行

NSString*str=[[NSString alloc]initWithData:returnData编码：NSUTF8StringEncoding];应该在该completionHandler中。检查本教程：请查看我的代码。如果我单独添加那一行，我下面所有的代码都会被删除error@jj1：将所有代码放在[dataTask resume]之后；在块内部（我在此处使用数据），用数据替换returnData，并检查是否需要使用data
NSData*returnData=[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]替换此行returnData