我发现了这个:

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 "{}"

来源:https://gist.github.com/ZevEisenberg/5a172662cb576872d1ab

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

试试这个，对我很有效。

单行代码

[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:[[NSBundle mainBundle] bundleIdentifier]];

我发现了这个:

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 "{}"

来源:https://gist.github.com/ZevEisenberg/5a172662cb576872d1ab

我喜欢扩展，因为它能让代码更简洁:

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

        self.removePersistentDomainForName(domainName)
    }
}

斯威夫特5

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

以下是Swift的答案:

let appDomain = NSBundle.mainBundle().bundleIdentifier!
NSUserDefaults.standardUserDefaults().removePersistentDomainForName(appDomain)