File size: 715 Bytes
fc93158 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | import Foundation
func withUserDefaults<T>(_ updates: [String: Any?], _ body: () throws -> T) rethrows -> T {
let defaults = UserDefaults.standard
var snapshot: [String: Any?] = [:]
for key in updates.keys {
snapshot[key] = defaults.object(forKey: key)
}
for (key, value) in updates {
if let value {
defaults.set(value, forKey: key)
} else {
defaults.removeObject(forKey: key)
}
}
defer {
for (key, value) in snapshot {
if let value {
defaults.set(value, forKey: key)
} else {
defaults.removeObject(forKey: key)
}
}
}
return try body()
}
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