1，導航欄透明

[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                                              forBarMetrics:UIBarMetricsDefault];
 self.navigationController.navigationBar.shadowImage = [UIImage new];

2，漸變

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    UIImageView
 
 *barImageView = self.navigationController.navigationBar.subviews.firstObject;

    CGFloat minAlphaOffset = - 64;
    CGFloat maxAlphaOffset = 200;
    CGFloat offset = scrollView.contentOffset.y;
    CGFloat alpha = (offset - minAlphaOffset) / (maxAlphaOffset - minAlphaOffset);
    barImageView.alpha
 
 = alpha;
}

3，狀態列和標題的顏色

//狀態列
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
//標題顏色
self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName : [UIColor someColor]}
//導航欄子控制元件顏色
self.navigationController.navigationBar.tintColor = [UIColor
 
 someColor];

4，釋放tableView 的 delegate(不然你進進出出時候會發現哪裡好像不太對)

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    self.tableView.delegate = self;
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    self.tableView.delegate = nil;
}

5，導航欄是公有的

需要在ViewWillDisappear裡面再把導航欄設定