objective-c : make basic table view with custom background and jason data v.6

snippet.m

//make basic table view with custom background and jason data v.6
//following Collision Behavior 델리게이트 -> 상단 바운더리를 두어 스냅 시 상단에 뷰가 snap되도록 코딩
    
//DynamicSandwichViewController.m

@interface DynamicSandwichViewController () <UICollisionBehaviorDelegate> //Collision Behavior 델리게이트

- (UIView*)addRecipeAtOffset:(CGFloat)offset forSandwich:(NSDictionary*)sandwich {
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    ...
    
    // 4. Upper boundary
    boundaryStart = CGPointMake(0.0, 0.0);
    boundaryEnd = CGPointMake(self.view.bounds.size.width, 0.0);
    [collision addBoundaryWithIdentifier:@2 fromPoint:boundaryStart toPoint:boundaryEnd];
    collision.collisionDelegate = self;
    
    ...
    
    return view;
}


#pragma mark - Collision Behavior 델리게이트

- (void)collisionBehavior:(UICollisionBehavior *)behavior beganContactForItem:(id<UIDynamicItem>)item
   withBoundaryIdentifier:(id<NSCopying>)identifier atPoint:(CGPoint)p {
    
    if ([@2 isEqual:identifier]) {
        
        UIView* view = (UIView*) item;
        [self tryDockView:view]; //뷰를 창 상단에 docking 시킬지 여부 결정
    }
}


@end