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Nikita Ermolenko
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Nikita Ermolenko
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Mar 12, 2017
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // | ||
| // Observer.swift | ||
| // NxEnabled | ||
| // | ||
| // Created by Nikita Ermolenko on 12/01/2017. | ||
| // Copyright © 2017 Nikita. All rights reserved. | ||
| // | ||
|
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| import UIKit.UIControl | ||
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| typealias EnabledHandler = (Bool) -> Void | ||
| typealias ConfigurationHandler = ([String]) -> Bool | ||
|
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| final class NUIObserver: NSObject { | ||
|
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| private var enabledHandler: EnabledHandler | ||
| private var textableValues: NSPointerArray /// Weak array of textable values. | ||
| private var configurationHandler: ConfigurationHandler | ||
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| deinit { | ||
| textableValues.allObjects.map { textableValueTuple(by: $0) }.forEach { (value, key) in | ||
| value.removeObserver(self, forKeyPath: key) | ||
| } | ||
| } | ||
|
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| init(textableValues: [NSObject], configurationHandler: @escaping ConfigurationHandler, enabledHandler: @escaping EnabledHandler) { | ||
| self.configurationHandler = configurationHandler | ||
| self.enabledHandler = enabledHandler | ||
| self.textableValues = NSPointerArray(options: .weakMemory) | ||
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| super.init() | ||
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| textableValues.forEach { value in | ||
| self.textableValues.addPointer(Unmanaged.passUnretained(value).toOpaque()) | ||
| } | ||
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| let textableValueTuples = textableValues.map { textableValueTuple(by: $0) } | ||
| textableValueTuples.forEach { (value, key) in | ||
| value.addObserver(self, forKeyPath: key, options: [.new, .initial], context: nil) | ||
|
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| switch value { | ||
| case let value as UIControl: value.addTarget(self, action:#selector(textableValueChanged), for: .editingChanged) | ||
| case let value as UITextView: NotificationCenter.default.addObserver(self, | ||
| selector: #selector(textVewChanged), | ||
| name: .UITextViewTextDidChange, | ||
| object: value) | ||
| default: break | ||
| } | ||
| } | ||
| } | ||
|
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| // MARK: Text changing events | ||
|
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| /// This method is called when the `UITextViewTextDidChange` notification of `UITextView` is triggered. | ||
| @objc private func textVewChanged() { | ||
| configureEnabling() | ||
| } | ||
|
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| /// This method is called when the `editingChanged` event of `UIControl` is triggered. | ||
| @objc private func textableValueChanged() { | ||
| configureEnabling() | ||
| } | ||
|
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| override func observeValue(forKeyPath keyPath: String?, | ||
| of object: Any?, | ||
| change: [NSKeyValueChangeKey : Any]?, | ||
| context: UnsafeMutableRawPointer?) { | ||
| configureEnabling() | ||
| } | ||
|
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| // MARK: Helpers | ||
|
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| private func configureEnabling() { | ||
| let texts = textableValues.allObjects.map { textableValue -> String in | ||
| let object = textableValue as! NSObject | ||
| let key = (object as! Textable).textKey | ||
| return object.value(forKey: key) as? String ?? "" | ||
| } | ||
| enabledHandler(configurationHandler(texts)) | ||
| } | ||
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| private func textableValueTuple(by value: Any) -> (value:NSObject, key:String) { | ||
| let textableValue = value as! NSObject | ||
| let key = (textableValue as! Textable).textKey | ||
| return (textableValue, key) | ||
| } | ||
| } |
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