ios - 如何在我的网络服务中显示加载 View Controller

Question

我想在调用 loginUserintoserver 方法时显示加载 View Controller 或事件指示器 View ，但在调试时我发现该 View 在这一行变得不活动。

 NSData *responseData = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:nil error:nil]; 

有一段时间，直到我得到回应。我曾尝试显示事件指标，但没有成功。请任何指导方针来解决这个问题。提前致谢。

-(void) loginUserintoserver

{

NSString *str_validateURL = @"callogin";

//em,password,devicereg,devicetype,flag = ("e"or "m")

NSString *str_completeURL = [NSString stringWithFormat:@"%@%@", str_global_domain, str_validateURL];
NSURL *url = [NSURL URLWithString:str_completeURL];


NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60];

[theRequest setHTTPMethod:@"POST"];

[theRequest setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

str_global_UserPhone = [NSString stringWithFormat:@"%@%@",signupCountryCodeTextField.text,signupMobileTextField.text];

NSString *postData = [NSString stringWithFormat:@"em=%@&password=%@&devicereg=%@&devicetype=%@&flag=%@", loginEmailTextField.text, loginPasswordTextField.text, str_global_DeviceRegID, @"1", [NSString stringWithFormat:@"%@", emailphoneFlag]];

NSLog(@"==============%@",postData);
NSString *length = [NSString stringWithFormat:@"%d", [postData length]];

[theRequest setValue:length forHTTPHeaderField:@"Content-Length"];

[theRequest setHTTPBody:[postData dataUsingEncoding:NSASCIIStringEncoding]];

// here the view becomes inactive and takes time to get response from server

NSData *responseData = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:nil error:nil];
NSLog(@"response data is %@", responseData);

if (responseData == nil)
{
    NSLog(@"No data from server");

    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error"
                                                        message:@"No data downloaded from server!"
                                                       delegate:nil
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles: nil];
    [alertView show];

}
else
{
    NSLog(@"response data is %@", responseData);
    NSString *returnString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    NSLog(@"returnString....%@",returnString);

    NSDictionary *response_dic = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:nil];

    NSString *msg;
    msg = [response_dic objectForKey:@"Result"];
    NSDictionary *loginDict=[[NSDictionary alloc]init];
    loginDict=[response_dic objectForKey:@"Result"];
    NSLog(@"msg is  : %@ ",[response_dic objectForKey:@"Result"]);

    if ([[[response_dic objectForKey:@"Result"] objectForKey:@"ErrorCode"] isEqualToString:@"0"])
    {
        // success
        NSLog(@"Successfull Login!!!!!");

        NSString *UserId=[loginDict objectForKey:@"userid"];
        [[NSUserDefaults standardUserDefaults] setValue:UserId  forKey:@"LoginId"];

        [self initRevealViewController];


    } else if ([[[response_dic objectForKey:@"Result"] objectForKey:@"ErrorCode"] isEqualToString:@"1"]){
        NSLog(@"Invalid Password!");

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message: @"ReEnter Password" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];


    }else if ([[[response_dic objectForKey:@"Result"] objectForKey:@"ErrorCode"] isEqualToString:@"3"]){
        NSLog(@"Invalid input parameters!");

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message: @"Email address or Mobile number, Password, devicereg, devicetype, flag are Mandatory" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];


    }else if ([[[response_dic objectForKey:@"Result"] objectForKey:@"ErrorCode"] isEqualToString:@"6"]){
        NSLog(@"Invalid input parameters!");

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message: @"User Registered but not activated" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];

    }
}
}

Answer 1

你必须使用这个:MBProgressHUD

从上面的链接导入框架并做一些事情，比如:

.h 文件:

   #import "MBProgressHUD.h"

   MBProgressHUD *HUD;

.m 文件执行此操作:

      HUD = [[MBProgressHUD alloc] initWithView:self.view];
      [self.view addSubview:HUD];

      [HUD show:YES];
      // call your webservice here

      [HUD hide:YES];

可能会有所帮助。

快乐编码... :)