使用目标c中的UserDefaults访问ImageUrl

Question

我已经从图像拾取器中获取了图像并将图像上传到Web服务，并且我使用了一个图像URL。

-(void)postSignupService {
[NewJsonHelperClass postExecuteWithParams:@"signup" secondParm:[self signUpParams] onCompletion:^(NSDictionary *json){
    if ([[json valueForKey:@"status"] isEqualToString:@"success"]) {
        NSDictionary *dataDict =[NSDictionary new];
        dataDict =[json valueForKey:@"user"];
        [[NSUserDefaults standardUserDefaults] setObject:@"sucess" forKey:@"LoginStatus"];
        [[NSUserDefaults standardUserDefaults] setObject:[dataDict valueForKey:@"_id"] forKey:@"user_Id"];
        [[NSUserDefaults standardUserDefaults] setObject:[dataDict valueForKey:@"userName"] forKey:@"userName"];
        [[NSUserDefaults standardUserDefaults] setObject:[dataDict valueForKey:@"password"] forKey:@"Password"];
        [[NSUserDefaults standardUserDefaults] setObject:[dataDict valueForKey:@"email"] forKey:@"email_Id"];
        [[NSUserDefaults standardUserDefaults] setObject:[dataDict valueForKey:@"profile_pic"] forKey:@"image_Str"];
        NSLog(@"datadict is %@",dataDict);
        SelectFoodVC *selectVc = [appDelegateRef.storyBoard instantiateViewControllerWithIdentifier:@"SelectFoodVC"];
        [self.navigationController pushViewController:selectVc animated:YES];
    //    TabBarController *tabVc = [appDelegateRef.storyBoard instantiateViewControllerWithIdentifier:@"TabBarController"];
     //   [self.navigationController pushViewController:tabVc animated:YES];
    }
    else{
        [reUse showAlertWithTitle:[json valueForKey:@"status"] message:[json valueForKey:@"user"] thirdParam:self];
    }
}];
}
-(NSDictionary *)signUpParams {
    NSMutableDictionary *params =[NSMutableDictionary new];
    params[@"userName"] =self.userNameTf.text;
    params[@"email"] =self.emailTf.text;
    params[@"password"] =self.passwordTf.text;
    NSLog(@"imgstr is %@",imgStr);
    params[@"profile_pic"] =imgStr;

return params;
}

此处profile pic value是imgstr，它是从Web服务中获得的imageUrl。

当我尝试在不同的ViewController中检索imageUrl时，用户默认值的值是无效的，因为它显示了错误。

NSString *urlstring = [[NSUserDefaults standardUserDefaults] objectForKey:@"image_Str"];
NSLog(@"urlstring is %@",urlstring);

这里的urlstring为null，错误是错误：请求失败：找不到(404(

Answer 1

  NSString *str = [NSString stringWithFormat:@"http://swiftdeveloperblog.com/wp-content/uploads/2015/07/1.jpeg"];
    NSURL *url = [NSURL URLWithString:str];
    [[NSUserDefaults standardUserDefaults]setURL:url forKey:@"URL"];
    [[NSUserDefaults standardUserDefaults]synchronize];

   NSString *getURL = [[NSUserDefaults standardUserDefaults]URLForKey:@"URL"];
    NSLog(@"url is %@",getURL);