IOS开展：导航中添加多个button并加入左侧logo

添加多个button，同样只能加入一个

 UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"register", nil) style:UIBarButtonItemStylePlain target:self action:@selector(registerClick:)];
            UIBarButtonItem *anotherButton2 = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"login", nil) style:UIBarButtonItemStylePlain target:self action:@selector(loginClick:)];
            [self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects: anotherButton,anotherButton2,nil]]; UIBarButtonItem *anot