How to show loading view controller in my webservi

问题:

I want to show a loading view controller or activity indicator view when I call my loginUserintoserver method but while debugging I found the view becomes inactive at this line.

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

For sometime till I get the response. I have tried showing activity indicators but did not succeed. Please any guidelines to resolve this. Thanks in advance.

-(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];

    }
}
}

回答1:

Most of the answers are partial which do not point out the main issue in your code.

Synchronous request on main thread will block it, thus you cannot show any UI updates like activity indicator while the sync request is in progress. Instead make asynchronous request (or make request in background using GCD) and use UIActivityIndicatorView or any other open source available for this.

Follow this Q&A to learn how to make asyn request using GCD: NSURLConnection and grand central dispatch

You can create and add an activity indicator to the view. Present and start showing activity when request is initiated and stop the activity when request completes downloading.

Hope that helps!

回答2:

You have to used this: MBProgressHUD

Import framwork from above link and do some stuff like:

.h file:

   #import "MBProgressHUD.h"

   MBProgressHUD *HUD;

.m file do this :

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

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

      [HUD hide:YES];

May be it will help.

Happy coding...:)

回答3:

Mak ,

I use MBProgressHUD all my project . You can use also .Really MBProgressHUD is suitable , lightweight.

Showing indicator :

[MBProgressHUD showHUDAddedTo:self.view animated:YES];

hiding :

[MBProgressHUD hideHUDForView:self.view animated:YES];

回答4:

https://github.com/jdg/MBProgressHUD

Download the project for MBProgressHUD , and copy MBProgressHUD.h & .m classes in to your project, Now by simply creating an instance of MBProgressHUD and using the available methods by MBProgressHUD you can show loading view on to your web services

HUD = [[MBProgressHUD alloc] initWithWindow:[[UIApplication sharedApplication] delegate].window];
[HUD showWhileExecuting:@selector(loginUserintoserver) onTarget:self withObject:nil animated:YES];
[[[UIApplication sharedApplication] delegate].window addSubview:HUD];

Hope it will help you .