1. Install pod " pod 'MBProgressHUD', '~> 0.9.1' " in your Xcode project
2. Once pods are installed successfully close your Xcode project & now open Xcode xcworkspace.
3. Now import mbprogress hud as #import "MBProgressHUD.h" in your desired View Controller.
4. Once imported succesfully create an object of MbProgress hud in your View Controller or utilities folder as

// SPINNER
-(BOOL)showLoader
{
    if (!spinner) {

        spinner = [[MBProgressHUD alloc]initWithView:self.view];
    }

    [self.view addSubview:spinner];
    [spinner show:YES];
    return YES;
}

5. Now you can use your Mbprogress hud in any ViewController you want,by simply importing #import "MBProgressHUD.h" & What's important is where to start spinner & where to stop.
6. Lets say you want to show spinner by the time u click Login Button & the stop spinner when it successfully Logs in.So all you have to do is call your loader/spinner/Mbprogress hud as [self showLoader]; at the action of your Login button.
7. Now when you have performed Login Operation successfully to remove spinner simple call

[spinner show:NO];

8. [spinner show:YES] will remove your Mbprogress hud..thanks for reading.