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** 
 *  清除默认的NSUserDefaults的所有数据
 */  
- (void)clearAllUserDefaultsData  
{  
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];  
      
    NSDictionary *dic = [userDefaults dictionaryRepresentation];  
    for (id  key in dic) {  
        [userDefaults removeObjectForKey:key];  
    }  
    [userDefaults synchronize];  
}  

** 
 *  清除默认的NSUserDefaults的所有数据
 */ 
- (void)clearAllUserDefaultsData  
{  
    NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];  
    [[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];  
}