DRGKeyboardManager

GOAL

Moving all the code responsible to updating the view after the keyboard state change to a class manager. We don't like the Massive ViewControllers :)

DESCRIPTION

A simple manager resizes the viewController.view when either a keyboard appears or disappears. The change is animated and synchronized with the keyboard's animation.

DISCUSSION

The idea is to resize the viewController's container view using an animation. Since we are resizing the superview, this manager works perfectly with UITableViews, UICollectionViews and UIScrollViews (scrollable views in general). We are not modifying the scrollview's contentView, only its superview (the view that contains the scrollview).

IMPORTANT ISSUES

• If your viewController doesn't contain an scrollable view, then you are responsible to ensure that your UI looks great after its superview was resized. You can use its delegate's methods to perform changes in the layout, and adapt it to the new size.

• About scrollable views. After resizing their superview, these automatically adjust their scroll in order to make visible the active field. However, you can always adjust manually the view's scroll after the animation was finished. Take a look at the sample project.

• viewController's width view will never change.

HOW TO USE IT

Five pretty straightforward steps

    #import "SimpleViewController.h"
    // 1. Import the class
    #import "DRGKeyboardManager.h"
    
    @interface SimpleViewController ()
    
    // 2. Create a property
    @property (nonatomic, strong) DRGKeyboardManager *kbManager;
    
    @end
    
    @implementation SimpleViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        
        // 3. Initialize the keyboard manager
        self.kbManager = [[DRGKeyboardManager alloc] initForViewController:self];
    }
    
    - (void)viewDidAppear:(BOOL)animated {
        [super viewDidAppear:animated];
        
        // 4. Register to UIKeyboard notifications
        [self.kbManager beginObservingKeyboard:[NSNotificationCenter defaultCenter]];
    }
    
    - (void)viewWillDisappear:(BOOL)animated {
        [super viewWillDisappear:animated];
        
        // 5. Don't forget to unregister it
        [self.kbManager endObservingKeyboard];
    }