NSUserDefaults initWithSuiteName泄漏iOS 8中的内存吗？

Question

My project uses ARC. The Leaks tool in Instruments is reporting that NSUserDefaults initWithSuiteName: leaks memory.

Has anyone else noticed this?

NSUserDefaults *theDefaults = [[NSUserDefaults alloc] initWithSuiteName:self.myGroupNameStr];

Answer 1

OK, this appears to be my own issue.

Unlike [NSUserDefaults standardUserDefaults] , my own code must assume retain ownership of [[NSUserDefaults alloc] initWithSuiteName:@"group.com.company.app"] .

So the fix is to initialize self.myDefaults when my UIInputViewController loads, and then nil self.myDefaults in my UIInputViewController 's dealloc.

Answer 2

Create a singleton sharedManager for NSUserDefaults, and initialise the object once for the app cycle

+ (NSUserDefaults *)groupUserDefaults
{
    static NSUserDefaults *sharedGroupUserDefaults = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedGroupUserDefaults = [[self alloc] initWithSuiteName:@"group.company.appName"];        
    });
    return sharedGroupUserDefaults;
}

Answer 3

// try this way .//

[[NSUserDefaults standardUserDefaults] setObject:AppDel.arrQueueForOffline forKey:@"Queued_Process"];

[[NSUserDefaults standardUserDefaults] synchronize];