Create a Utility function for UIActivityIndicator to show and hide depending on the condition in controller - ios

Question

Hello I have created a swift file in which I wrote some utility functions which I used in multiple controllers. I also wrote function for UIActivityIndicator. But somehow its not working as expected.
Here is my function
static func showIndicatorView(backgroundView: UIView,controller: UIViewController)->UIActivityIndicatorView{
let loadingIndicator = UIActivityIndicatorView(frame: CGRectMake(0, 0, 50, 50))
let backgroundView = UIView()
backgroundView.layer.cornerRadius = 05
backgroundView.clipsToBounds = true
backgroundView.opaque = false
backgroundView.backgroundColor = UIColor(white: 0.0, alpha: 0.6)
loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
loadingIndicator.color = UIColor.whiteColor()
loadingIndicator.startAnimating()
let loadingLabel = UILabel()
loadingLabel.text = "Loading..."
loadingLabel.textColor = UIColor.whiteColor()
let textSize: CGSize = loadingLabel.text!.sizeWithAttributes([NSFontAttributeName: loadingLabel.font ])
loadingLabel.frame = CGRectMake(50, 0, textSize.width, textSize.height)
loadingLabel.center.y = loadingIndicator.center.y
backgroundView.frame = CGRectMake(0, 0, textSize.width + 70, 50)
backgroundView.center = controller.view.center;
controller.view.addSubview(backgroundView)
backgroundView.addSubview(loadingIndicator)
backgroundView.addSubview(loadingLabel)
return loadingIndicator
}
I am doing this in controllers in order to show and hide the indicator
show
Utility.showIndicatorView(backgroundView, controller: self).startAnimating()
hide
Utility.showIndicatorView(backgroundView, controller: self).startAnimating()
Sometimes UiIndicatorView background doesn't remove from the controller. Please check my code and let me know how can I show and hide the uiindicator in one or two lines

Answer 1

Create a class for your loading view and add functions to show and hide the view like this:
import UIKit
class LoadingView: UIView {
override init (frame : CGRect) {
super.init(frame : frame)
let loadingIndicator = UIActivityIndicatorView(frame: CGRectMake(0, 0, 50, 50))
let backgroundView = UIView()
backgroundView.layer.cornerRadius = 05
backgroundView.clipsToBounds = true
backgroundView.opaque = false
backgroundView.backgroundColor = UIColor(white: 0.0, alpha: 0.6)
loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
loadingIndicator.color = UIColor.whiteColor()
loadingIndicator.startAnimating()
let loadingLabel = UILabel()
loadingLabel.text = "Loading..."
loadingLabel.textColor = UIColor.whiteColor()
let textSize: CGSize = loadingLabel.text!.sizeWithAttributes([NSFontAttributeName: loadingLabel.font ])
loadingLabel.frame = CGRectMake(50, 0, textSize.width, textSize.height)
loadingLabel.center.y = loadingIndicator.center.y
backgroundView.frame = CGRectMake(0, 0, textSize.width + 70, 50)
backgroundView.center = self.center;
self.addSubview(backgroundView)
backgroundView.addSubview(loadingIndicator)
backgroundView.addSubview(loadingLabel)
}
convenience init () {
self.init(frame:UIScreen.mainScreen().bounds)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func showLoadingView() {
if let rootViewController = UIApplication.topViewController() {
rootViewController.view.addSubview(self)
self.bringSubviewToFront(rootViewController.view)
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}
}
func hideLoadingView() {
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
self.removeFromSuperview()
}
}
// Get the visible ViewController
extension UIApplication {
class func topViewController(base: UIViewController? = UIApplication.sharedApplication().keyWindow?.rootViewController) -> UIViewController? {
if let nav = base as? UINavigationController {
return topViewController(nav.visibleViewController)
}
if let tab = base as? UITabBarController {
let moreNavigationController = tab.moreNavigationController
if let top = moreNavigationController.topViewController where top.view.window != nil {
return topViewController(top)
} else if let selected = tab.selectedViewController {
return topViewController(selected)
}
}
if let presented = base?.presentedViewController {
return topViewController(presented)
}
return base
}
}
Then init your loading view in your ViewController.
let lv = LoadingView()
lv.showLoadingView()
lv.hideLoadingView()