1.自定義的UITabBarController的釋放問題
發(fā)生場景：退出登錄時候求摇，頁面由tabViewController切到登錄頁窍荧，執(zhí)行代碼
@property (strong,nonatomic) GBTabViewController *tabViewController;
LoginViewController *LoginViewVC = [[LoginViewController alloc] init];
LoginViewVC.title = @"登錄";
KKNavigationController *nav = [[KKNavigationController alloc] initWithRootViewController:LoginViewVC];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
此時之前的rootViewController即tabViewController并不會釋放辉巡，需要
self.tabViewController = nil才會釋放12e1
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