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A simple UISearchController with an activity indicator at search icon.
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| // | |
| // UISearchControllerWithIndicator.swift | |
| // | |
| // Created by Afshin Hoseini on 2/10/16. | |
| // https://github.com/afshin-hoseini | |
| // | |
| import Foundation | |
| import UIKit | |
| class UISearchControllerWithIndicator: UISearchController { | |
| private var didPutActivityIndicator = false | |
| private var searchTextField: UIView? = nil | |
| private var activityIndicator: UIActivityIndicatorView? = nil | |
| private var searchIcon: UIImageView? = nil | |
| private func putActivityIndicator() { | |
| guard !didPutActivityIndicator else { return } | |
| let containerView = self.searchBar.subviews[0] | |
| activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.Gray) | |
| activityIndicator!.frame = CGRectMake(0, 0, 0, 0) | |
| //Inserts activity indicator inside the UISearchTextField | |
| for var i=0; i < containerView.subviews.count; i++ { | |
| let view = containerView.subviews[i] | |
| if view is UITextField { | |
| for v in view.subviews { | |
| if v is UIImageView { | |
| searchIcon = v as? UIImageView | |
| } | |
| searchTextField = view | |
| view.addSubview(activityIndicator!) | |
| didPutActivityIndicator = true | |
| } | |
| break | |
| } | |
| } | |
| } | |
| var showActivityIndicator: Bool = false { | |
| didSet { | |
| putActivityIndicator() | |
| if showActivityIndicator { | |
| activityIndicator?.startAnimating() | |
| self.activityIndicator!.frame = CGRectMake(self.searchIcon!.frame.origin.x, self.searchIcon!.frame.origin.y, self.searchIcon!.frame.size.width, self.searchIcon!.frame.size.height) | |
| self.activityIndicator?.alpha = 0 | |
| self.searchIcon?.alpha = 1 | |
| UIView.animateWithDuration(0.5, animations: { () -> Void in | |
| self.activityIndicator?.alpha = 1 | |
| self.searchIcon?.alpha = 0 | |
| }) | |
| } | |
| else { | |
| UIView.animateWithDuration(0.5, animations: { () -> Void in | |
| self.activityIndicator?.alpha = 0 | |
| self.searchIcon?.alpha = 1 | |
| }) | |
| } | |
| } | |
| } | |
| } |
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Basically this class derived
UISearchControllerand shows anUIActivityIndicatorinstead the magnifier icon by setting theshowActivityIndicatortotrueand vice versa, with alpha animation