Created
March 24, 2017 16:57
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| //: Playground - noun: a place where people can play | |
| import UIKit | |
| protocol BoolUserDefaults { | |
| func bool(forKey defaultName: String) -> Bool | |
| func set(_ value: Any?, forKey defaultName: String) | |
| } | |
| extension UserDefaults: BoolUserDefaults {} | |
| final class FirstLaunch { | |
| let wasLaunchedBefore: Bool | |
| var isFirstLaunch: Bool { | |
| return !wasLaunchedBefore | |
| } | |
| init(userDefaults: BoolUserDefaults = UserDefaults.standard) { | |
| let key = "com.any-suggestion.FirstLaunch.WasLaunchedBefore" | |
| let wasLaunchedBefore = userDefaults.bool(forKey: key) | |
| self.wasLaunchedBefore = wasLaunchedBefore | |
| if !wasLaunchedBefore { | |
| userDefaults.set(true, forKey: key) | |
| } | |
| } | |
| } | |
| FirstLaunch().isFirstLaunch | |
| FirstLaunch().isFirstLaunch | |
| //TESTS | |
| class MockUserDefaults: BoolUserDefaults { | |
| var defaults = [String: Bool]() | |
| var mockedValue: Bool? | |
| func bool(forKey defaultName: String) -> Bool { | |
| return mockedValue ?? defaults[defaultName] ?? false | |
| } | |
| func set(_ value: Any?, forKey defaultName: String) { | |
| guard let value = value else { | |
| defaults[defaultName] = nil | |
| return | |
| } | |
| guard let boolValue = value as? Bool else { | |
| fatalError("should it be bool?") | |
| } | |
| defaults[defaultName] = boolValue | |
| } | |
| } | |
| let mockedDefaults = MockUserDefaults() | |
| assert(FirstLaunch(userDefaults: mockedDefaults).isFirstLaunch) | |
| assert(!FirstLaunch(userDefaults: mockedDefaults).isFirstLaunch) |
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