Created
January 26, 2016 19:14
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import Foundation | |
extension NSUserDefaults { | |
func removeAllKeys(except except: [String]? = nil) { | |
guard let appDomain = NSBundle.mainBundle().bundleIdentifier else { return } | |
let defaults = NSUserDefaults.standardUserDefaults() | |
var dict: [String: AnyObject]? | |
if let except = except { | |
for key in except { | |
if let value = defaults.objectForKey(key) { | |
if dict == nil { dict = [:] } | |
dict![key] = value | |
} | |
} | |
} | |
defer { | |
if let dict = dict { | |
for (key, value) in dict { | |
defaults.setObject(value, forKey: key) | |
} | |
} | |
} | |
defaults.removePersistentDomainForName(appDomain) | |
} | |
} | |
// Usage: | |
NSUserDefaults.standardUserDefaults().setObject("One", forKey: "key1") | |
NSUserDefaults.standardUserDefaults().setObject("None", forKey: "keyN") | |
NSUserDefaults.standardUserDefaults().removeAllKeys(except: ["keyN"]) | |
print("key1:", NSUserDefaults.standardUserDefaults().objectForKey("key1")) | |
print("keyN:", NSUserDefaults.standardUserDefaults().objectForKey("keyN")) |
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