UINavigationBar Category which allows you to change its appearance dynamically

I tried to create your example in code instead of in the storyboard.

In AppDelegate I created:

let vc = Page1ViewController()
window?.rootViewController = UINavigationController(rootViewController: vc)

Page1ViewController is:

@objc(Page1ViewController)
class Page1ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

  let cellIndentifier = "cell"
  let NAVBAR_CHANGE_POINT:CGFloat = 50

  @IBOutlet weak var tableView: UITableView!
  var topView:UIView!
  var topImageView: UIImageView?


  override func viewDidLoad() {
    super.viewDidLoad()

    self.navigationItem.setLeftBarButtonItem(UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Cancel, target: self, action: "someAction"), animated: true)

    self.tableView.delegate = self
    self.tableView.dataSource = self
    self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: cellIndentifier)
    self.navigationController?.navigationBar.lt_setBackgroundColor(UIColor.clearColor())


    topView = UIView(frame: CGRectMake(0, 0, 320, 212))
    topView.backgroundColor = UIColor.yellowColor()
    tableView.addSubview(topView)


    let img = UIImage(named: "bg2")
    topImageView = UIImageView(image: img)
    topImageView?.frame = CGRectMake(0, -89, 320, 307)
    topImageView?.contentMode = UIViewContentMode.ScaleToFill
    topView.addSubview(topImageView!)

    topView.superview?.sendSubviewToBack(topView)

  }
  ...
}

In the nib of Page1ViewController I just inserted a UITableView and linked the outlet to tableView.

Here is the result when I run the app:

It works like your demo app with the exception that the header does not have the correct height. How can I change that?

Thanks for help!

Awesome code for a nice effect, thank you. I have one problem where the back button does not work any longer when I navigate down a few layers. Any idea what that could be? It might be my code.

• (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; [self.navigationController.navigationBar lt_reset]; }

push to other Controller navigationBar color can not set to default

I am writing code for app with future support so basically i'm looking at all side previous versions, current version, as well as future version which will be iOS 10.

This category works perfect until iOS 9.3.3 but in iOS 10 its not working, i've tested on both iDevice and Simulator

I'm setting clear colour for navigation bar at viewDidLoad as below

[self.navigationController.navigationBar setShadowImage:[UIImage new]]; [self.navigationController.navigationBar lt_setBackgroundColor:[UIColor clearColor]];

Please someone help me out with this.

I'm sorry for my english, i don't know what language you're using 😜

Thanks.

不知道苹果抽什么风，Your app uses or references the following non-public APIs:

UIInputSetHostView, UIKeyboard, UINavigationItemView, UIPeripheralHostView

The use of non-public APIs is not permitted on the App Store because it can lead to a poor user experience should these APIs change.

LTNavigationBar[11369:4642197] [Accessibility] ****************** Loading GAX Client Bundle **************** 2017-06-28 14:30:40.795882+0800 LTNavigationBar[11369:4642197] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UINavigationBar 0x1039250a0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key _leftViews.' *** First throw call stack: (0x186ed9858 0x1856b0528 0x186ed9520 0x187a26e88 0x18796ceac 0x10367efc0 0x10367e05c 0x10367de80 0x18d9e000c 0x19d4e7f00 0x18d705b5c 0x18d7ab6c0 0x18d871a0c 0x18dd49978 0x18dd4df1c 0x18d862b9c 0x18d7181f4 0x18dd38364 0x18dd37f24 0x18dd37080 0x18d7164f4 0x18d6e7b38 0x19d4af210 0x18dfe9514 0x18dfeb984 0x18dfe4af0 0x186e80528 0x186e7fe0c 0x186e7d904 0x186d9c280 0x1888adf94 0x18d74b0f0 0x10367ea80 0x185b8de40) libc++abi.dylib: terminating with uncaught exception of type NSException

I used a single UINavigationBar(NOT UINavigationController), App crashed on lt_setBackgroundColor method. It seems that UINavigationBar subviews structure has changed.

我有一个方法会频繁调用

- (void)handlePopGesture:(UIPanGestureRecognizer *)popGesture
{
    // 计算用户手指划了多远
    CGFloat progress = [popGesture translationInView:self.view].x / (self.view.bounds.size.width * 1.0);
    progress = MIN(1.0, MAX(0.0, progress));
    YPLog(@"%f",progress);

    CGFloat r = _endR - _startR;
    CGFloat g = _endG - _startG;
    CGFloat b = _endB - _startB;

    UIColor *endColor = [UIColor colorWithRed:_startR + r * progress green:_startG + g * progress blue:_startB + b * progress alpha:1.0f];

    [self.navigationController.navigationBar lt_setBackgroundColor:endColor];
}

随着进度改变Bar的背景颜色。。 发现不好用 颜色不会变

当我在 AppDelegate.m 中调用了如下代码：

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"navBg"]
                                  forBarPosition:UIBarPositionTopAttached
                                      barMetrics:UIBarMetricsDefault];

LCNavigationBar 就会失效，如下图：

There's a problem in iOS7 when opening view controller in landscape. Overlay gets width from screen's width which is 320px for iPhone 4 and not 480px which is expected. Setting width to self.bounds' width resolves this issue.

When using the lt_setBackgroundColorthe color changes somewhat abruptly.

Ir would be awesome if the color could change in a smoother way with an animation.

Hey, Itebean, LTNavigationBar is really a simple and great library, don't let it down. I spent some time to make it work on iOS 11 and 12. Also I have tested it on iOS 8, 9, 10, 11 and 12. Please merge.

- (void)lt_setBackgroundColor:(UIColor *)backgroundColor
{
    
    
    if (!self.overlay) {
        [self setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
        //适配iPhoneX
        CGFloat navigationBarHeight = 0;
        if ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1125, 2436), [[UIScreen mainScreen] currentMode].size) : NO) {
            navigationBarHeight = 44.0f+self.frame.size.height;
        }else{
            navigationBarHeight = 20.f+self.frame.size.height;
        }
        self.overlay = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.bounds),navigationBarHeight)];
        self.overlay.userInteractionEnabled = NO;
        self.overlay.autoresizingMask = UIViewAutoresizingFlexibleWidth;   
        [[self.subviews firstObject] insertSubview:self.overlay atIndex:0];
    }
    self.overlay.backgroundColor = backgroundColor;
}

工程适配iOS 11 调用了lt_setBackgroundColor这个方法 导航栏透明时title和rightBarButtonItem显示正常 滑动页面 导航栏出现时title和rightBarButtonItem被遮挡 因为[self insertSubview:self.overlay atIndex:0];这句代码 使self.overlay出现在NavigationBar的最上层