App Store Today tile touch effect

ViewController.m

//
//  ViewController.m
//  tile
//
//  Created by Michael Hurni on 20/10/2018.
//  Copyright © 2018 Michael Hurni. All rights reserved.
//

#import "ViewController.h"

@interface MAHTableView : UITableView {
    CGPoint initialOffset;
    BOOL isPressed;
}
@end

@implementation MAHTableView

- (void)didTouchWithGestureReconizer:(UIGestureRecognizer *)g {
    if([self.delegate respondsToSelector:@selector(didTouchWithGestureReconizer:)]) {
        [self.delegate performSelector:@selector(didTouchWithGestureReconizer:) withObject:g];
        return;
    }
    
    // default behavior, call the original didSelectRowAtIndexPath delegation method
    NSIndexPath *indexPath;
    
    if([g isKindOfClass:UILongPressGestureRecognizer.class]) {
        indexPath = [self indexPathForRowAtPoint:[g locationInView:self]];
    } else {
        indexPath = [self indexPathForRowAtPoint:g.view.frame.origin];
    }
    
    if([self.delegate respondsToSelector:@selector(tableView:didSelectRowAtIndexPath:)]) {
        [self.delegate tableView:self didSelectRowAtIndexPath:indexPath];
    }
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    // Simultaneous UIScrollViewPanGestureRecognizer and UILongPressGestureRecognizer
    return ([gestureRecognizer isKindOfClass:UILongPressGestureRecognizer.class] ||
            [otherGestureRecognizer isKindOfClass:UILongPressGestureRecognizer.class]);
}

- (void)addGestureReconizersToView:(UIView *)view {
    UILongPressGestureRecognizer *press = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPressGesture:)];
    press.minimumPressDuration = 0.2;
    
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)];
    tap.numberOfTapsRequired = 1;
    
    [view addGestureRecognizer:press];
    [view addGestureRecognizer:tap];
}

- (void)handleLongPressGesture:(UILongPressGestureRecognizer*)g {
    if (g.state == UIGestureRecognizerStateBegan) {
        if(isPressed) return;
        
        isPressed = YES;
        initialOffset = self.contentOffset;
        
        [UIView animateWithDuration:.5 delay:0
             usingSpringWithDamping:.8 initialSpringVelocity:.2
                            options:UIViewAnimationOptionBeginFromCurrentState
                         animations:^{ g.view.transform = CGAffineTransformMakeScale(0.95, 0.95); }
                         completion:nil];
    }
    else if (g.state == UIGestureRecognizerStateEnded || g.state == UIGestureRecognizerStateCancelled) {
        if(isPressed == NO) return;
        [self didTouchWithGestureReconizer:g];
    }
    
    if ((g.state == UIGestureRecognizerStateEnded || g.state == UIGestureRecognizerStateCancelled) ||
        (g.state == UIGestureRecognizerStateChanged && fabs(self.contentOffset.y - initialOffset.y) > 20))
    {
        // Restore initial aspect
        [UIView animateWithDuration:.5 delay:0 usingSpringWithDamping:.4 initialSpringVelocity:.2 options:UIViewAnimationOptionBeginFromCurrentState animations:^{ g.view.transform = CGAffineTransformIdentity; } completion:^(BOOL finished) { isPressed = NO; }];
    }
}

- (void)handleTapGesture:(UITapGestureRecognizer *)g {
    [UIView animateWithDuration:.2 delay:0
         usingSpringWithDamping:.8 initialSpringVelocity:.2
                        options:UIViewAnimationOptionBeginFromCurrentState
                     animations:^{ g.view.transform = CGAffineTransformMakeScale(0.98, 0.98); }
                     completion:^(BOOL finished) {
                         [self didTouchWithGestureReconizer:g];
                         // Restore initial aspect
                         [UIView animateWithDuration:.2 delay:0 usingSpringWithDamping:.4 initialSpringVelocity:.2 options:UIViewAnimationOptionBeginFromCurrentState animations:^{ g.view.transform = CGAffineTransformIdentity; } completion:nil];
                     }];
}

@end

@interface ViewController () <UITableViewDelegate, UITableViewDataSource> @end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    MAHTableView *tableView = [[MAHTableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    tableView.delegate = self;
    tableView.dataSource = self;
    tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    tableView.contentInset = UIEdgeInsetsMake(tableView.layoutMargins.top, 0, tableView.layoutMargins.bottom, 0);
    
    [self.view addSubview:tableView];
}

- (BOOL)prefersStatusBarHidden { return YES; }

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return 8; }

- (CGFloat)tableView:(UITableView *)t heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return (t.bounds.size.height - t.contentInset.top) / 4.5;
}

- (UITableViewCell *)tableView:(UITableView *)t cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    UITableViewCell *cell = [t dequeueReusableCellWithIdentifier:@"cell"];
    
    if(cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        
        UIView *tile = [UIView new];
        tile.layer.cornerRadius = 10;
        tile.translatesAutoresizingMaskIntoConstraints = NO;
        
        [cell.contentView addSubview:tile];
        [cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[tile]-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(tile)]];
        [cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[tile]-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(tile)]];
        
        [(MAHTableView *)t addGestureReconizersToView:cell];
    }
    
    cell.contentView.subviews.firstObject.backgroundColor = self.class.randomColor;
    
    return cell;
}

- (void)tableView:(UITableView *)t didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [t cellForRowAtIndexPath:indexPath].contentView.subviews.firstObject.backgroundColor = self.class.randomColor;
}

+ (UIColor *)randomColor {
    return [UIColor colorWithHue:( arc4random() % 256 / 256.0 )
                      saturation:( arc4random() % 128 / 256.0 ) + .5
                      brightness:( arc4random() % 128 / 256.0 ) + .5 alpha:1];
}

@end