blocks|key|3553142|text|您可以像这样删除应用程序的持久域：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3553143|NSString+*appDomain+=+[[NSBundle+mainBundle]+bundleIdentifier];
[[NSUserDefaults+standardUserDefaults]+removePersistentDomainForName:appDomain];|code-block|syntax|javascript|3553144|在Swift+3和更高版本中：|3553145|if+let+bundleID+=+Bundle.main.bundleIdentifier+{
++++UserDefaults.standard.removePersistentDomain(forName:+bundleID)
}|3553146|这与@samvermette的答案类似，但在IMO中更清晰一些。|3553147|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can remove the application's persistent domain like this:

<pre><code>NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
</code></pre>

In Swift 3 and later:

<pre><code>if let bundleID = Bundle.main.bundleIdentifier {
 UserDefaults.standard.removePersistentDomain(forName: bundleID)
}
</code></pre>

This is similar to the answer by @samvermette but is a little bit cleaner IMO.

blocks|key|335156|text|此代码将默认值重置为注册域：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|335157|[[NSUserDefaults+standardUserDefaults]+setPersistentDomain:[NSDictionary+dictionary]+forName:[[NSBundle+mainBundle]+bundleIdentifier]];|code-block|syntax|javascript|335158|换句话说，它会为你在该应用程序中注册的每个密钥执行removeObjectForKey。|offset|length|style|CODE|335159|在这个苹果开发者论坛thread.上致敬肯·汤玛斯|335160|entityMap|0|LINK|mutability|MUTABLE|url|https://devforums.apple.com/message/223038^0|0|0|P|I|0|A|7|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|11|8|@]|9|@$I|12|J|13|1|14]]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

This code resets the defaults to the registration domain:

<pre><code>[[NSUserDefaults standardUserDefaults] setPersistentDomain:[NSDictionary dictionary] forName:[[NSBundle mainBundle] bundleIdentifier]];
</code></pre>

In other words, it <code>removeObjectForKey</code> for every single key you ever registered in that app.

Credits to Ken Thomases on this Apple Developer Forums <a href="https://devforums.apple.com/message/223038" rel="noreferrer">thread.</a>

blocks|key|335098|text|您是否尝试过使用-removeObjectForKey|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|335099|+[[NSUserDefaults+standardUserDefaults]+removeObjectForKey:@"defunctPreference"];|code-block|syntax|javascript|335100|entityMap^0|9|I|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Did you try using -<code>removeObjectForKey</code>?

<pre><code> [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"defunctPreference"];
</code></pre>

blocks|key|3553466|text|以下是Swift的答案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3553467|let+appDomain+=+NSBundle.mainBundle().bundleIdentifier!
NSUserDefaults.standardUserDefaults().removePersistentDomainForName(appDomain)|code-block|syntax|javascript|3553468|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is the answer in Swift:

<pre><code>let appDomain = NSBundle.mainBundle().bundleIdentifier!
NSUserDefaults.standardUserDefaults().removePersistentDomainForName(appDomain)
</code></pre>

blocks|key|3553193|text|如果你在开发时需要它，你也可以重置你的模拟器，删除所有的NSUserDefaults。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3553194|iOS模拟器->重置内容和设置...|BOLD|3553195|请记住，它还将删除模拟器上的所有应用程序和文件。|3553196|entityMap^0|S|E|0|0|I|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|P|8|@$9|Q|A|R|B|H]]|D|@]|E|$]]|$1|I|3|J|5|6|7|S|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|L|$]]

If you need it while developing, you can also reset your simulator, deleting all the <code>NSUserDefaults</code>.

iOS Simulator -> Reset Content and Settings...

Bear in mind that it will also delete all the apps and files on simulator.

blocks|key|4400299|text|NSDictionary+*defaultsDictionary+=+[[NSUserDefaults+standardUserDefaults]+dictionaryRepresentation];
for+(NSString+*key+in+[defaultsDictionary+allKeys])+{
++++++++++++++++++++[[NSUserDefaults+standardUserDefaults]+removeObjectForKey:key];
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4400300|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>NSDictionary *defaultsDictionary = [[NSUserDefaults standardUserDefaults] dictionaryRepresentation];
for (NSString *key in [defaultsDictionary allKeys]) {
 [[NSUserDefaults standardUserDefaults] removeObjectForKey:key];
}
</code></pre>

blocks|key|4400601|text|在Swift中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4400602|let+defaults+=+NSUserDefaults.standardUserDefaults()
defaults.dictionaryRepresentation().keys.forEach+{+defaults.removeObjectForKey($0)+}|code-block|syntax|javascript|4400603|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In Swift:

<pre><code>let defaults = NSUserDefaults.standardUserDefaults()
defaults.dictionaryRepresentation().keys.forEach { defaults.removeObjectForKey($0) }
</code></pre>

blocks|key|4400651|text|我喜欢扩展，因为它们让代码变得更干净：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4400652|extension+NSUserDefaults+{
++++func+clear()+{
++++++++guard+let+domainName+=+NSBundle.mainBundle().bundleIdentifier+else+{
++++++++++++return
++++++++}

++++++++self.removePersistentDomainForName(domainName)
++++}
}|code-block|syntax|javascript|4400653|Swift+5|offset|length|style|BOLD|4400654|extension+UserDefaults+{
++++func+clear()+{
++++++++guard+let+domainName+=+Bundle.main.bundleIdentifier+else+{
++++++++++++return
++++++++}
++++++++removePersistentDomain(forName:+domainName)
++++++++synchronize()
++++}
}|4400655|entityMap^0|0|0|0|7|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I love extensions when they make the code cleaner:

<pre><code>extension NSUserDefaults {
 func clear() {
 guard let domainName = NSBundle.mainBundle().bundleIdentifier else {
 return
 }

 self.removePersistentDomainForName(domainName)
 }
}
</code></pre>

Swift 5

<pre><code>extension UserDefaults {
 func clear() {
 guard let domainName = Bundle.main.bundleIdentifier else {
 return
 }
 removePersistentDomain(forName: domainName)
 synchronize()
 }
}
</code></pre>

blocks|key|4400535|text|注:此答案也已针对Swift更新。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4400536|把它放在一行怎么样？|4400537|扩展@Christopher+Rogers的答案-被接受的答案。|4400538|[[NSUserDefaults+standardUserDefaults]+removePersistentDomainForName:[[NSBundle+mainBundle]+bundleIdentifier]];|code-block|syntax|javascript|4400539|是的，有时你可能需要synchronize它，|CODE|4400540|[[NSUserDefaults+standardUserDefaults]+synchronize];|4400541|我已经创建了一种方法来实现这一点，|4400542|-+(void)+clearDefaults+{
++++[[NSUserDefaults+standardUserDefaults]+removePersistentDomainForName:[[NSBundle+mainBundle]+bundleIdentifier]];
++++[[NSUserDefaults+standardUserDefaults]+synchronize];
}|4400543|4400544|Swift|4400545|使用swift就更容易了。|4400546|extension+UserDefaults+{
++++class+func+clean()+{
++++++++guard+let+aValidIdentifier+=+Bundle.main.bundleIdentifier+else+{+return+}
++++++++standard.removePersistentDomain(forName:+aValidIdentifier)
++++++++standard.synchronize()
++++}
}|4400547|和用法|4400548|UserDefaults.clean()|4400549|entityMap^0|0|H|0|0|0|0|A|B|0|0|0|0|0|0|5|0|0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1D|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1E|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1F|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1G|8|@$9|1H|A|1I|B|Q]]|D|@]|E|$]]|$1|R|3|S|5|L|7|1J|8|@]|D|@]|E|$M|N]]|$1|T|3|U|5|6|7|1K|8|@]|D|@]|E|$]]|$1|V|3|W|5|L|7|1L|8|@]|D|@]|E|$M|N]]|$1|X|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|10|3|11|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|12|3|13|5|L|7|1R|8|@]|D|@]|E|$M|N]]|$1|14|3|15|5|6|7|1S|8|@$9|1T|A|1U|B|C]]|D|@]|E|$]]|$1|16|3|17|5|L|7|1V|8|@]|D|@]|E|$M|N]]|$1|18|3|-4|5|6|7|1W|8|@]|D|@]|E|$]]]|19|$]]

Note: This answer has been updated for Swift too.

What about to have it on one line?

Extending @Christopher Rogers answer – the accepted one.

<pre><code>[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:[[NSBundle mainBundle] bundleIdentifier]];
</code></pre>

and yes, sometime you may need to <code>synchronize</code> it,

<pre><code>[[NSUserDefaults standardUserDefaults] synchronize];
</code></pre>

I've created a method to do this,

<pre><code>- (void) clearDefaults {
 [[NSUserDefaults standardUserDefaults] removePersistentDomainForName:[[NSBundle mainBundle] bundleIdentifier]];
 [[NSUserDefaults standardUserDefaults] synchronize];
}
</code></pre>

<hr>

Swift?

With swift its even more easy.

<pre><code>extension UserDefaults {
 class func clean() {
 guard let aValidIdentifier = Bundle.main.bundleIdentifier else { return }
 standard.removePersistentDomain(forName: aValidIdentifier)
 standard.synchronize()
 }
}
</code></pre>

And usage:

<pre><code>UserDefaults.clean()
</code></pre>

blocks|key|4400456|text|我发现了这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4400457|osascript+-e+'tell+application+"iOS+Simulator"+to+quit'
xcrun+simctl+list+devices+%7C+grep+-v+'%5E[-=]'+%7C+cut+-d+"("+-f2+%7C+cut+-d+")"+-f1+%7C+xargs+-I+{}+xcrun+simctl+erase+"{}"|code-block|syntax|javascript|4400458|来源：https://gist.github.com/ZevEisenberg/5a172662cb576872d1ab|offset|length|4400459|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/ZevEisenberg/5a172662cb576872d1ab^0|0|0|3|1L|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I found this:

<pre><code>osascript -e 'tell application "iOS Simulator" to quit'
xcrun simctl list devices | grep -v '^[-=]' | cut -d "(" -f2 | cut -d ")" -f1 | xargs -I {} xcrun simctl erase "{}"
</code></pre>

Source: <a href="https://gist.github.com/ZevEisenberg/5a172662cb576872d1ab" rel="noreferrer">https://gist.github.com/ZevEisenberg/5a172662cb576872d1ab</a>

blocks|key|335443|text|所有上述答案都非常相关，但如果有人仍然无法重置删除的应用程序的用户默认值，那么您可以重置您的模拟器的内容设置，它将工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|335444|📷|atomic|offset|length|335445|​|335446|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/d7a464830f4b07c87d0f17659c8ff92c.png|imageAlt^0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P|Q|-4]]]]

All above answers are very relevant, but if someone still unable to reset the userdefaults for deleted app, then you can reset the content settings of you simulator, and it will work.<img src="https://i.stack.imgur.com/nGfET.png" alt="enter image description here">

blocks|key|3553545|text|这是一个错误或其他什么东西，但在清除所有NSUserDefaults值时removePersistentDomainForName不工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3553546|因此，更好的选择是重置PersistentDomain，您可以通过以下方式完成此操作：|3553547|NSUserDefaults.standardUserDefaults().setPersistentDomain(["":""],+forName:+NSBundle.mainBundle().bundleIdentifier!)|code-block|syntax|javascript|3553548|entityMap^0|K|E|10|T|0|B|G|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

It's a bug or whatever but the <code>removePersistentDomainForName</code> is not working while clearing all the <code>NSUserDefaults</code> values.

So, better option is that to reset the <code>PersistentDomain</code> and that you can do via following way:

<pre><code>NSUserDefaults.standardUserDefaults().setPersistentDomain(["":""], forName: NSBundle.mainBundle().bundleIdentifier!)
</code></pre>

blocks|key|335308|text|扩展@folse的答案...我相信更正确的实现应该是...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|335309|NSString+*appDomain+=+[[NSBundle+mainBundle]+bundleIdentifier];
NSDictionary+*defaultsDictionary+=+[[NSUserDefaults+standardUserDefaults]+persistentDomainForName:+appDomain];
++++for+(NSString+*key+in+[defaultsDictionary+allKeys])+{
++++++NSLog(@"removing+user+pref+for+%25@",+key);
++++++[[NSUserDefaults+standardUserDefaults]+removeObjectForKey:key];
++++}|code-block|syntax|javascript|335310|...calling+NSUserDefault的persistentDomainForName:方法。与docs状态一样，该方法“返回一个字典，其中包含指定持久域中的键和值”。调用dictionaryRepresentation:相反，将返回一个字典，该字典可能会包含其他设置，因为它适用于更广泛的范围。|335311|如果您需要过滤掉任何要重置的值，那么迭代键就是最好的方法。显然，如果你只想核化应用程序的所有首选项，而不去考虑，那么上面提到的其他方法之一是最有效的。|335312|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Expanding on @folse's answer... I believe a more correct implementation would be...

<pre><code>NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
NSDictionary *defaultsDictionary = [[NSUserDefaults standardUserDefaults] persistentDomainForName: appDomain];
 for (NSString *key in [defaultsDictionary allKeys]) {
 NSLog(@"removing user pref for %@", key);
 [[NSUserDefaults standardUserDefaults] removeObjectForKey:key];
 }
</code></pre>

...calling NSUserDefault's persistentDomainForName: method. As the docs state, the method "Returns a dictionary containing the keys and values in the specified persistent domain." Calling dictionaryRepresentation: instead, will return a dictionary that will likely include other settings as it applies to a wider scope.

If you need to filter out any of the values that are to be reset, then iterating over the keys is the way to do it. Obviously, if you want to just nuke all of the prefs for the app without regard, then one of the other methods posted above is the most efficient.

blocks|key|4400361|text|如果需要重置的应用程序设置是访问麦克风的默认设置(我的情况)，一个简单的解决方案是Anthony+McCormick+(Iphone+-+How+to+enable+application+access+to+media+on+the+device?+-+ALAssetsLibraryErrorDomain+Code=-3312+"Global+denied+access")的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4400362|在设备上，转到Settings>General>Reset>Reset+Location+Warning|4400363|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/3561321/iphone-how-to-enable-application-access-to-media-on-the-device-alassetslibr^0|1O|3K|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

if the application setting needing reset is nsuserdefault for access to microphone (my case), a simple solution is answer from Anthony McCormick (<a href="https://stackoverflow.com/questions/3561321/iphone-how-to-enable-application-access-to-media-on-the-device-alassetslibr">Iphone - How to enable application access to media on the device? - ALAssetsLibraryErrorDomain Code=-3312 &quot;Global denied access&quot;</a>).

on the device, go to Settings>General>Reset>Reset Location Warnings

blocks|key|335693|text|试试这个，它对我很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|335694|单行代码|335695|[[NSUserDefaults+standardUserDefaults]+removePersistentDomainForName:[[NSBundle+mainBundle]+bundleIdentifier]];|code-block|syntax|javascript|335696|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try This, It's working for me .

Single line of code 

<pre><code>[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:[[NSBundle mainBundle] bundleIdentifier]];
</code></pre>

I'm using <code>+[NSUserDefaults standardUserDefaults]</code> to store application settings. This consists of roughly a dozen string values. Is it possible to delete these values permanently instead of just setting them to a default value?

Clearing NSUserDefaults

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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功能1上新10个字符

功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符。

功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符。

功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符

功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符

功能4上新

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社区新版编辑器体验调研

我正在使用+[NSUserDefaults standardUserDefaults]来存储应用程序设置。它由大约12个字符串值组成。是否可以永久删除这些值，而不是仅将它们设置为默认值？

问清除NSUserDefaults
EN

回答 15

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回答 15

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问清除NSUserDefaults
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