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+//
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+// FLEXTableViewController.m
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+// FLEX
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+//
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+// Created by Tanner on 7/5/19.
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+// Copyright © 2019 Flipboard. All rights reserved.
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+//
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+
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+#import "FLEXTableViewController.h"
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+
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+@interface Block : NSObject
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+- (void)invoke;
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+@end
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+
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+CGFloat const kFLEXDebounceInstant = 0.f;
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+CGFloat const kFLEXDebounceFast = 0.05;
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+CGFloat const kFLEXDebounceForAsyncSearch = 0.15;
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+CGFloat const kFLEXDebounceForExpensiveIO = 0.5;
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+
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+@interface FLEXTableViewController ()
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+@property (nonatomic) NSTimer *debounceTimer;
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+@end
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+
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+@implementation FLEXTableViewController
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+
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+#pragma mark - Public
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+
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+- (id)init {
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+ if (@available(iOS 13.0, *)) {
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+ self = [self initWithStyle:UITableViewStyleInsetGrouped];
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+ } else {
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+ self = [self initWithStyle:UITableViewStyleGrouped];
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+ }
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+
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+ return self;
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+}
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+
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+- (id)initWithStyle:(UITableViewStyle)style {
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+ self = [super initWithStyle:style];
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+
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+ if (self) {
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+ self.searchBarDebounceInterval = kFLEXDebounceFast;
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+ }
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+
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+ return self;
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+}
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+
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+- (void)setShowsSearchBar:(BOOL)showsSearchBar {
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+ if (_showsSearchBar == showsSearchBar) return;
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+ _showsSearchBar = showsSearchBar;
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+
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+ UIViewController *results = self.searchResultsController;
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+ self.searchController = [[UISearchController alloc] initWithSearchResultsController:results];
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+ self.searchController.searchBar.placeholder = @"Filter";
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+ self.searchController.searchResultsUpdater = (id)self;
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+ self.searchController.delegate = (id)self;
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+ self.searchController.dimsBackgroundDuringPresentation = NO;
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+ self.searchController.hidesNavigationBarDuringPresentation = NO;
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+
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+ if (@available(iOS 11.0, *)) {
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+ self.navigationItem.searchController = self.searchController;
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+ } else {
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+ self.tableView.tableHeaderView = self.searchController.searchBar;
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+ }
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+}
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+
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+- (NSInteger)selectedScope {
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+ return self.searchController.searchBar.selectedScopeButtonIndex;
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+}
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+
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+- (NSString *)searchText {
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+ return self.searchController.searchBar.text;
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+}
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+
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+- (void)setAutomaticallyShowsSearchBarCancelButton:(BOOL)autoShowCancel {
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+ if (@available(iOS 13, *)) {
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+ self.searchController.automaticallyShowsCancelButton = autoShowCancel;
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+ } else {
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+ _automaticallyShowsSearchBarCancelButton = autoShowCancel;
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+ }
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+}
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+
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+- (void)updateSearchResults:(NSString *)newText { }
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+
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+- (void)onBackgroundQueue:(NSArray *(^)())backgroundBlock thenOnMainQueue:(void(^)(NSArray *))mainBlock {
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+ dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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+ NSArray *items = backgroundBlock();
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+ dispatch_async(dispatch_get_main_queue(), ^{
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+ mainBlock(items);
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+ });
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+ });
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+}
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+
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+#pragma mark - View Controller Lifecycle
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+
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+- (void)viewDidLoad {
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+ [super viewDidLoad];
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+
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+ self.tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
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+}
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+
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+- (void)viewWillAppear:(BOOL)animated {
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+ [super viewWillAppear:animated];
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+
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+ // Make the search bar re-appear instead of hiding
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+ if (@available(iOS 11.0, *)) {
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+ self.navigationItem.hidesSearchBarWhenScrolling = NO;
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+ }
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+}
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+
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+- (void)viewDidAppear:(BOOL)animated {
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+ [super viewDidAppear:animated];
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+
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+ // Allow scrolling to collapse the search bar,
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+ // only if we don't want it pinned
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+ if (@available(iOS 11.0, *)) {
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+ self.navigationItem.hidesSearchBarWhenScrolling = !self.pinSearchBar;
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+ }
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+}
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+
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+#pragma mark - Private
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+
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+- (void)debounce:(void(^)())block {
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+ [self.debounceTimer invalidate];
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+
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+ self.debounceTimer = [NSTimer
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+ scheduledTimerWithTimeInterval:self.searchBarDebounceInterval
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+ target:block
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+ selector:@selector(invoke)
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+ userInfo:nil
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+ repeats:NO
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+ ];
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+}
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+
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+#pragma mark - Search Bar
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+
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+#pragma mark UISearchResultsUpdating
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+
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+- (void)updateSearchResultsForSearchController:(UISearchController *)searchController
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+{
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+ [self.debounceTimer invalidate];
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+ NSString *text = searchController.searchBar.text;
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+
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+ // Only debounce if we want to, and if we have a non-empty string
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+ // Empty string events are sent instantly
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+ if (text.length && self.searchBarDebounceInterval > kFLEXDebounceInstant) {
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+ [self debounce:^{
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+ [self updateSearchResults:text];
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+ }];
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+ } else {
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+ [self updateSearchResults:text];
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+ }
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+}
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+
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+#pragma mark UISearchControllerDelegate
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+
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+- (void)willPresentSearchController:(UISearchController *)searchController {
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+ if (self.automaticallyShowsSearchBarCancelButton) {
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+ [searchController.searchBar setShowsCancelButton:YES animated:YES];
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+ }
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+}
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+
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+- (void)willDismissSearchController:(UISearchController *)searchController {
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+ if (self.automaticallyShowsSearchBarCancelButton) {
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+ [searchController.searchBar setShowsCancelButton:NO animated:YES];
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+ }
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+}
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+
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+@end
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Tanner Bennett