如何使用NSURLSession保存Facebook个人资料图片？

我只是创建一个简单的Facebook登录应用程序，在我的viewdidload（）方法中，我有权限，我得到的名称，用户名，电子邮件ID和个人资料图片链接，但我想要做的是尝试并下载该链接（URL）并在本地保存/下载。如何使用NSURLSession保存Facebook个人资料图片？

刚开始使用x代码和任何帮助，将不胜感激。

> - (void)viewDidLoad { 
>  
>  [super viewDidLoad];  
>  FBSDKLoginButton *loginButton = [[FBSDKLoginButton alloc] init]; loginButton.center = self.view.center; [loginButton 
> setDelegate:self]; 
>  loginButton.loginBehavior=FBSDKLoginBehaviorWeb; 
>   [self.view addSubview:loginButton]; 
>  loginButton.readPermissions = @[@"public_profile",@"email",@"user_friends",@"user_about_me",@"user_friends",@"user_birthday",@"user_hometown"]; 
>  [email protected][@"publish_actions"]; 
>  FBSDKLoginManagerLoginResult *result; 
>  
>  
> 
>  { 
>   if ([result.grantedPermissions containsObject:@"email"]) { 
>    NSLog(@"%@",result); 
>   } 
>  } 
> 
>  NSMutableDictionary* param = [NSMutableDictionary dictionary]; 
>  [param setValue:@"id,name,email,picture.width(100).height(100),bio" 
> forKey:@"fields"]; 
> 
> 
>  NSURL *profilePictureURL = [NSURL URLWithString:[NSString stringWithFormat:@"https://graph.facebook.com/user/picture?type=large"]]; 
>              NSURLRequest *profilePictureURLRequest = [NSURLRequest requestWithURL:profilePictureURL 
> cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0f]; 
> // Facebook profile picture cache policy: Expires in 2 weeks 
>  [NSURLSession sessionWithConfiguration:profilePictureURLRequest delegate:self delegateQueue:nil];

来源

2016-02-19 Prakhar Rawat

与NSURLRequest创建NSURLSessionDataTask任务：

NSURL *profilePictureURL = ...; 
NSURLRequest *profilePictureURLRequest = ...; 

NSURLSession *session = [NSURLSession sharedSession]; 
NSURLSessionDataTask *task = [session dataTaskWithRequest:profilePictureURLRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { 

    // This block is called when the request completes/fails. 

    if ((!error) && (data.length > 0)) { 

     // Write to local URL on background thread. 
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{ 

      NSURL *someFileUrl = ...; 

      [data writeToUrl:someFileUrl atomically:YES]; 

     }); 
    } 
}]; 

// Send the request... 
[task resume];

来源

2016-02-19 12:48:40

试试这个代码会被保存在申请文件目录下的图像。

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{ 
        NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"https://graph.facebook.com/%@/picture?type=normal",[result objectForKey:@"id"]]]]; 
        [imageData writeToFile:[NSString stringWithFormat:@"%@/profilePic.jpg",[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]] atomically:YES]; 
       })

来源

2016-02-19 13:04:39 kb920

如何使用NSURLSession保存Facebook个人资料图片？

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