iOS开发之设置导航栏为全透明，且去掉边框黑线

[self.navigationController.navigationBarsetTranslucent:YES];
    [self.navigationController.navigationBarsetBackgroundImage:[[UIImagealloc] init] forBarMetrics:UIBarMetricsDefault];

    //去黑线

   self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];

//导航栏的view

    UILabel *label = [[UILabelalloc]initWithFrame:self.navigationController.navigationBar.frame];