如何快速自动清除NSUserDefault值? [英] How to auto clear NSUserDefault values in swift?

问题描述

如何快速快速清除nsuserdefault值?我已经尝试过了，但这对我不起作用...

How can I auto clear the nsuserdefault values in swift? I have already tried this but it doesn't work for me...

[[NSUserDefaults standardUserDefaults] setPersistentDomain:[NSDictionary dictionary] forName:[[NSBundle mainBundle] bundleIdentifier]];

推荐答案

检查已经存储了多少个密钥

check how many keys are already stored

print(NSUserDefaults.standardUserDefaults().dictionaryRepresentation().keys.array.count)

仅添加另一个键

NSUserDefaults.standardUserDefaults().setBool(true, forKey: "justAnotherKey1")
NSUserDefaults.standardUserDefaults().setBool(true, forKey: "justAnotherKey2")

检查已再次存储多少个键(+2)

check how many keys are already stored again (+2)

print(NSUserDefaults.standardUserDefaults().dictionaryRepresentation().keys.array.count)

现在创建一个循环以删除键的对象

now create a loop to remove your object for the keys

for key in NSUserDefaults.standardUserDefaults().dictionaryRepresentation().keys {
    NSUserDefaults.standardUserDefaults().removeObjectForKey(key.description)
}

检查您又有多少把钥匙

print(NSUserDefaults.standardUserDefaults().dictionaryRepresentation().keys.array.count)

更新: Xcode 7.2.1•Swift 2.1.1 (请注意，NSUserDefaults不再适用于游乐场，因此需要在真实项目中进行测试)

update: Xcode 7.2.1 • Swift 2.1.1 (note NSUserDefaults doesn't work in playground anymore, so it needs to be tested in a real project)

print(Array(NSUserDefaults.standardUserDefaults().dictionaryRepresentation().keys).count)

NSUserDefaults.standardUserDefaults().setBool(true, forKey: "justAnotherKey1")
NSUserDefaults.standardUserDefaults().setBool(true, forKey: "justAnotherKey2")

print(Array(NSUserDefaults.standardUserDefaults().dictionaryRepresentation().keys).count)

for key in Array(NSUserDefaults.standardUserDefaults().dictionaryRepresentation().keys) {
    NSUserDefaults.standardUserDefaults().removeObjectForKey(key)
}

print(Array(NSUserDefaults.standardUserDefaults().dictionaryRepresentation().keys).count)

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