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NSUserDefaultsのsynchronizeって忘れるよね

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自分向けコードスニペット。
NSUserDefaultsのsynchronize()を呼ぶのを忘れてしまうので、下記のようなラップクラスを思いついた。

class UserDefaultsWrapper {
    private var instance: NSUserDefaults

    init(instance: NSUserDefaults = NSUserDefaults.standardUserDefaults()) {
        self.instance = instance
    }

    func defaults() -> NSUserDefaults {
        return instance
    }

    deinit {
        instance.synchronize()
    }
}

使いやすいかどうかはまた考えよう。

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