How to programmatically add a simple default loading(progress) bar in iphone app

Question

I am using http communication in My iPhone app. I want to show a progress bar while it is loading data from server. How can I do it programmatically?

I just want a d

Answer 1

UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
indicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0);
indicator.center = self.view.center;    
[self.view addSubview:indicator];
[indicator bringSubviewToFront:self.view];
[UIApplication sharedApplication].networkActivityIndicatorVisible = TRUE;

Write below code when you want to show indicator

[indicator startAnimating];

write below code when you want to hide indicator

[indicator stopAnimating];

Answer 2

Translating @Hiren's answer to Swift

 var indicator: UIActivityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.gray)
 indicator.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
 indicator.center = view.center
 self.view.addSubview(indicator)
 self.view.bringSubview(toFront: indicator)
 UIApplication.shared.isNetworkActivityIndicatorVisible = true

Show indicator

indicator.startAnimating()

Stop indicator

indicator.stopAnimating()

Answer 3

Swift 5.x Version

import UIKit

class SKLoader: NSObject {
    
    static let sharedInstance = SKLoader()

    let indicator: UIActivityIndicatorView? = UIActivityIndicatorView(style: UIActivityIndicatorView.Style.medium)

    let screen = UIScreen.main.bounds

    var appDelegate: SceneDelegate {
        guard let sceneDelegate = UIApplication.shared.connectedScenes
            .first!.delegate as? SceneDelegate else {
                fatalError("sceneDelegate is not UIApplication.shared.delegate")
        }
        return sceneDelegate
    }
    
    var rootController:UIViewController? {
        guard let viewController = appDelegate.window?.rootViewController else {
            fatalError("There is no root controller")
        }
        return viewController
    }
    
    func show() {
        indicator?.frame = CGRect(x: 0.0, y: 0.0, width: 40.0, height: 40.0)
        indicator?.frame.origin.x = (screen.width/2 - 20)
        indicator?.frame.origin.y = (screen.height/2 - 20)
        rootController?.view.addSubview(indicator!)
        indicator?.startAnimating()
    }
    
    func hide() {
        DispatchQueue.main.async {
            self.indicator?.stopAnimating()
            self.indicator?.removeFromSuperview()
        }
    }
}

Sample Usage:

//To Show

SKLoader.sharedInstance.show()

//To Hide

SKLoader.sharedInstance.hide()

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Answer 4

I know this is an older question but I've written a global static method for doing this type of thing from any view, based on the above answers.

Main updates are:

• support optional opaque overlay behind the activity indicator
• use default frame sizing for the activity indicator
• use .WhiteLarge indicator style

In my AppHelper.swift:

static func showActivityIndicator(view: UIView, withOpaqueOverlay: Bool) {

    // this will be the alignment view for the activity indicator
    var superView: UIView = view

    // if we want an opaque overlay, do that work first then put the activity indicator within that view; else just use the passed UIView to center it
    if withOpaqueOverlay {
        let overlay = UIView()
        overlay.frame = CGRectMake(0.0, 0.0, view.frame.width, view.frame.height)
        overlay.layer.backgroundColor = UIColor.blackColor().CGColor
        overlay.alpha = 0.7
        overlay.tag = activityIndicatorOverlayViewTag

        overlay.center = superView.center
        overlay.hidden = false
        superView.addSubview(overlay)
        superView.bringSubviewToFront(overlay)

        // now we'll work on adding the indicator to the overlay (now superView)
        superView = overlay
    }

    let indicator: UIActivityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: .WhiteLarge)

    indicator.center = superView.center
    indicator.tag = activityIndicatorViewTag
    indicator.hidden = false

    superView.addSubview(indicator)
    superView.bringSubviewToFront(indicator)

    indicator.startAnimating()

    // also indicate network activity in the status bar
    UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}

static func hideActivityIndicator(view: UIView) {

    // stop the network activity animation in the status bar
    UIApplication.sharedApplication().networkActivityIndicatorVisible = false

    // remove the activity indicator and optional overlay views
    view.viewWithTag(activityIndicatorViewTag)?.removeFromSuperview()
    view.viewWithTag(activityIndicatorOverlayViewTag)?.removeFromSuperview()
}

Answer 5

Add Property

@property (strong, nonatomic) IBOutlet UIActivityIndicatorView *indicator;

To Start Animating

[self.indicator startAnimating];

To Stop Animating

[self.indicator stopAnimating];

Answer 6

Try MBProgressHUD.

It's pretty simple, got several progress animation options, and able to add some customization. It displays fullscreen. And it should work with any recent iOS versions.

Or try LDProgressView if you want something more fancy :) It somehow looks like OSX progress bar.