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create superClass for loading view and empty state views
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grenos
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Apr 12, 2020
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GHFollowers/Components/ViewControllers/GFDataLoadingVC.swift
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,67 @@ | ||
| // | ||
| // GFDataLoadingVC.swift | ||
| // GHFollowers | ||
| // | ||
| // Created by Vasileios Gkreen on 12/04/2020. | ||
| // Copyright © 2020 Vasileios Gkreen. All rights reserved. | ||
| // | ||
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| import UIKit | ||
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| class GFDataLoadingVC: UIViewController { | ||
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| var containerView: UIView! | ||
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| func showLoadingView() { | ||
| // init container view and set it to fill the entire screen | ||
| containerView = UIView(frame: view.bounds) | ||
| // add the container view into the VC view (which ever is going to call this func) | ||
| view.addSubview(containerView) | ||
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| containerView.backgroundColor = .systemBackground | ||
| containerView.alpha = 0 | ||
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| // animate alpha | ||
| UIView.animate(withDuration: 0.25) { | ||
| self.containerView.alpha = 0.8 | ||
| } | ||
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| // add activity indicator | ||
| let activityIndicator = UIActivityIndicatorView(style: .large) | ||
| containerView.addSubview(activityIndicator) | ||
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| activityIndicator.translatesAutoresizingMaskIntoConstraints = false | ||
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| // center indicator on containerView | ||
| NSLayoutConstraint.activate([ | ||
| activityIndicator.centerYAnchor.constraint(equalTo: view.centerYAnchor), | ||
| activityIndicator.centerXAnchor.constraint(equalTo: view.centerXAnchor) | ||
| ]) | ||
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| activityIndicator.startAnimating() | ||
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| } | ||
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| func dismissLoadingView() { | ||
| // We will always going to dismiss Loading View from a background thread | ||
| // because we call this function from the Network manager closure (promise) | ||
| // to avoid that we need to throw it in the main thread | ||
| DispatchQueue.main.async { | ||
| self.containerView.removeFromSuperview() | ||
| self.containerView = nil | ||
| } | ||
| } | ||
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| // calling this function from a VC we wiil pass the message and a the view so we know where to constrain it | ||
| func showEmptyStateView(with message: String, in view: UIView) { | ||
| let emptyStateView = GFEmptyStateView(message: message) | ||
| // fill up the entire screen | ||
| emptyStateView.frame = view.bounds | ||
| // add it to the VC subView | ||
| view.addSubview(emptyStateView) | ||
| } | ||
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| } |
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