UINavigationBar

How to add action to UINavigation title?

• method 1: add UIButton to it
• method 2: add tap gesture to it reference

How to set navigation bar title with a text field?

UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(0, 0, 200, 22)];
textField.text = @"Insert Title Here";
textField.font = [UIFont boldSystemFontOfSize:19];
textField.textColor = [UIColor whiteColor];
textField.textAlignment = NSTextAlignmentCenter;
textField.delegate = self;
self.navigationItem.titleView = textField;

To show/hide navigation bar

//hide Navigation bar :
[self.navigationController setNavigationBarHidden:YES animated:YES];
//show Navigation bar :
[self.navigationController setNavigationBarHidden:NO animated:YES];

how to change navigation bar tint color

self.navigationController.navigationBar.barTintColor = [UIColor colorWithRed:26/255.0f green:188/255.0f blue:156/255.0f alpha:1.0f];
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor]}];
self.navigationController.navigationBar.translucent = NO;

how remove the 1px black border under navigation bar?

//need to add a subview to overlay it
UIView *navBorder = [[UIView alloc] initWithFrame:CGRectMake(0,navigationBar.frame.size.height-1,navigationBar.frame.size.width, 1)];

// Change the frame size to suit yours //

[navBorder setBackgroundColor:[UIColor colorWithWhite:200.0f/255.f alpha:0.8f]];
[navBorder setOpaque:YES];
[navigationBar addSubview:navBorder];
[navBorder release];

more discussion can be found here