UINavigationController+DAPowerfulCustomization

A category to expand UINavigationController

1. When setLeftBarButtonItems: or setLeftBarButtonItem: on UINavigationItem, the default interactive pop gesture is avalible like normal, you do not need to do more.

2. When using the properties of UINavigationItem below, you can easily custom the navigation bar and status bar appearance in different view controllers, the appearance transition when push or pop will be wonderful.

3. When user click the default back button on navigation bar, you can handle the click event and you can prevent the pop event by returning NO.

4. You can handle the interactive pop gesture recognizer event, returning no to prevent it began.

Enjoy it.

Communication

• If you found a bug, and can provide steps to reliably reproduce it, open an issue.
• If you have a feature request, open an issue.
• If you want to contribute, submit a pull request.

Installation

Use CocoaPods

pod 'UINavigationController+DAPowerfulCustomization'

Requirements

Minimum iOS Target iOS 8.0.

Architecture

• UINavigationController+DAPowerfulCustomization.h
• UINavigationController+DAPowerfulCustomization.m

Usage

Import

#import "UINavigationController+DAPowerfulCustomization.h"

Use UINavigationItem+DAPowerfulCustomization

A category to expand UINavigationItem

Apple recommends each UIViewController use it's navigationItem to decide navigationBar appearance, such as title, titleView and so on. Sometimes the properties of UINavigationItem are not enough, so I expand the UINavigationItem to realize more customization of UINavigationBar.

You can use the properites below in your view controller, then the appearance of UINavigationBar in UINavigationController will auto update based on different UIViewController. I also do a little work to make status bar update alongside the view controller transition, you can use the three statusBar properties, or just use the methods of UIViewController which provided by Apple. Enjoy it.

self.navigationItem.da_statusBarStyle = UIStatusBarStyleLightContent;
self.navigationItem.da_statusBarHidden = NO;
self.navigationItem.da_statusBarAnimation = UIStatusBarAnimationFade;
self.navigationItem.da_navigationBarTintColor = [UIColor yellowColor];
self.navigationItem.da_navigationBarBarTintColor = [UIColor redColor];
self.navigationItem.da_navigationBarBackgroundViewAlpha = .5;
self.navigationItem.da_navigationBarTranslucent = YES;
self.navigationItem.da_navigationBarTitleTextAttributes = @{NSFontAttributeName: [UIFont systemFontOfSize:25]};
self.navigationItem.da_navigationBarHidden = YES;
self.navigationItem.da_navigationBarStyle = UIBarStyleBlack;

Use DANavigationControllerPopHandler

@protocol DANavigationControllerPopHandler <NSObject>
@optional
/**
 Override this method in UIViewController derived class to handle interactivePopGestureRecognizer

 @param interactivePopGestureRecognizer UINavigationController's interactivePopGestureRecognizer
 @return YES or NO, when return NO, then interactivePopGestureRecognizer will not begin
 */
- (BOOL)da_interactivePopGestureRecognizerShouldBegin:(nonnull __kindof UIGestureRecognizer *)interactivePopGestureRecognizer;
/**
 Override this method in UIViewController derived class to handle 'Back' button click
 */
- (BOOL)da_navigationControllerShouldPopOnBackButton;

@end
  

/**
 Make every UIViewController conforms to protocol <DANavigationControllerPopHandler>
 */
@interface UIViewController (DAPowerfulCustomization) <DANavigationControllerPopHandler>
@end

What you need is to override DANavigationControllerPopHandler methods in your view controller. It's very easy.

Use DANavigationItemUpdatesConfiguration

Version 1.1.0 and a new api to UIViewController. It's da_navigationItemUpdatesConfiguration. You can use this property to update navigation item automatically.

How to use it? It's very easy. In your view controller, input some words like this:

DANavigationItemUpdate *bgUpdate = [DANavigationItemUpdate updateWithNavigationItemKeyPath:@"da_navigationBarBackgroundViewAlpha" fromValue:@0 toValue:@1];
DANavigationItemUpdate *statusBarUpdate = [DANavigationItemUpdate updateWithNavigationItemKeyPath:@"da_statusBarStyle" fromValue:@(UIStatusBarStyleDefault) toValue:@(UIStatusBarStyleLightContent)];
DANavigationItemUpdate *tintColorUpdate = [DANavigationItemUpdate updateWithNavigationItemKeyPath:@"da_navigationBarTintColor" fromValue:[UIColor blackColor] toValue:[UIColor redColor]];
DANavigationItemUpdate *barButtonItemUpdate = [DANavigationItemUpdate updateWithNavigationItemKeyPath:@"rightBarButtonItem" fromValue:self.navigationItem.rightBarButtonItem toValue:nil];
DANavigationItemUpdate *titleAlphaItemUpdate = [DANavigationItemUpdate updateWithNavigationItemKeyPath:@"da_navigationBarTitleTextAttributes" fromValue:@{NSForegroundColorAttributeName: [UIColor greenColor]} toValue:@{NSForegroundColorAttributeName: [[UIColor greenColor] colorWithAlphaComponent:0]}];
DANavigationItemUpdatesConfiguration *configuration = [DANavigationItemUpdatesConfiguration configurationWithObservedScrollView:self.tableView triggerOffset:CGPointMake(0, 200) navigationItemUpdates:@[bgUpdate, statusBarUpdate, tintColorUpdate, barButtonItemUpdate, titleAlphaItemUpdate]];
self.da_navigationItemUpdatesConfiguration = configuration;

License

UINavigationController+DAPowerfulCustomization is released under the MIT license. See LICENSE for details.