ngutman

- (void)dragged:(UIPanGestureRecognizer *)gestureRecognizer
{
    CGFloat xDistance = [gestureRecognizer translationInView:self].x;
    CGFloat yDistance = [gestureRecognizer translationInView:self].y;

    switch (gestureRecognizer.state) {
        case UIGestureRecognizerStateBegan:{
            self.originalPoint = self.center;
            break;
        };

ngutman

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (!self) return nil;

    self.panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dragged:)];
    [self addGestureRecognizer:self.panGestureRecognizer];

    [self loadImageAndStyle];

ngutman

#import <Foundation/Foundation.h>

typedef NS_ENUM(NSUInteger , GGOverlayViewMode) {
    GGOverlayViewModeLeft,
    GGOverlayViewModeRight
};

@interface GGOverlayView : UIView
@property (nonatomic) GGOverlayViewMode mode;
@end

ngutman

#import "GGOverlayView.h"

@interface GGOverlayView ()
@property (nonatomic, strong) UIImageView *imageView;
@end

@implementation GGOverlayView

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];

ngutman

- (void)dragged:(UIPanGestureRecognizer *)gestureRecognizer
{
    CGFloat xDistance = [gestureRecognizer translationInView:self].x;
    CGFloat yDistance = [gestureRecognizer translationInView:self].y;

    switch (gestureRecognizer.state) {
        case UIGestureRecognizerStateBegan:{
            self.originalPoint = self.center;
            break;
        };

ngutman

#import "GGDraggableView.h"

@interface GGDraggableView ()
@property (nonatomic, strong) UIPanGestureRecognizer *panGestureRecognizer;
@end

@implementation GGDraggableView

- (id)init
{

ngutman

#import "GGView.h"
#import "GGDraggableView.h"

@interface GGView ()
@property (nonatomic, strong) GGDraggableView *draggableView;
@end

@implementation GGView

- (id)init

ngutman

- (void)loadViewController:(UIViewController *)vc
                  fromLeft:(BOOL)fromLeft
{
    [self addChildViewController:vc];
    if (!self.currentVC) {
        [self.view addSubview:vc.view];
        vc.view.frame = self.view.bounds;
        self.currentVC = vc;
        return;
    }

ngutman

- (void)tabTapped
{
    if ([self.currentVC isKindOfClass:[GGViewController1 class]]) {
        [self loadViewController:[[GGViewController2 alloc] init]];
    } else {
        [self loadViewController:[[GGViewController1 alloc] init]];
    }
}

ngutman

#import "GGViewController1.h"

@interface GGViewController1 ()

@end

@implementation GGViewController1

- (void)viewDidLoad
{