iOS 开发之 - iOS6适配 - 导航栏按钮透明方法

  UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeCustom];
    rightButton.frame = CGRectMake(0, 0, 40, 40);
    [rightButton setTitle:@"提交" forState:UIControlStateNormal];
    [rightButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [rightButton addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
   self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:rightButton];