Basic ROM management functionality

iOS/GBLoadROMTableViewController.m

@@ -11,6 +11,7 @@
 - (instancetype)init
 {
     self = [super initWithStyle:UITableViewStyleGrouped];
+    self.navigationItem.rightBarButtonItem = self.editButtonItem;
     return self;
 }
 
@@ -55,11 +56,16 @@
     return 64;
 }
 
-- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
+- (NSString *)title
 {
     return @"ROM Library";
 }
 
+- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section
+{
+    return @"Import ROMs using AirDrop or by opening them in SameBoy using the Files app";
+}
+
 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
     [GBROMManager sharedManager].currentROM = [GBROMManager sharedManager].allROMs[[indexPath indexAtPosition:1]];
@@ -73,4 +79,27 @@
     return UIModalPresentationFormSheet;
 }
 
+- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    if (editingStyle != UITableViewCellEditingStyleDelete) return;
+    NSString *rom = [GBROMManager sharedManager].allROMs[[indexPath indexAtPosition:1]];
+    UIAlertController *alert = [UIAlertController alertControllerWithTitle:[NSString stringWithFormat:@"Delete ROM “%@”?", rom]
+                                                                   message: @"Save data for this ROM will also be deleted."
+                                                            preferredStyle:UIAlertControllerStyleAlert];
+    [alert  addAction:[UIAlertAction actionWithTitle:@"Delete"
+                                               style:UIAlertActionStyleDestructive
+                                             handler:^(UIAlertAction * _Nonnull action) {
+        [[GBROMManager sharedManager] deleteROM:rom];
+        [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
+        if ([[GBROMManager sharedManager].currentROM isEqualToString:rom]) {
+            [GBROMManager sharedManager].currentROM = nil;
+            [[NSNotificationCenter defaultCenter] postNotificationName:@"GBROMChanged" object:nil];
+        }
+    }]];
+    [alert  addAction:[UIAlertAction actionWithTitle:@"Cancel"
+                                               style:UIAlertActionStyleCancel
+                                             handler:nil]];
+    [self presentViewController:alert animated:true completion:nil];
+}
+
 @end

iOS/GBROMManager.h

@@ -16,4 +16,5 @@
 - (NSString *)autosaveStateFileForROM:(NSString *)rom;
 - (NSString *)stateFile:(unsigned)index forROM:(NSString *)rom;
 - (NSString *)importROM:(NSString *)romFile keepOriginal:(bool)keep;
+- (void)deleteROM:(NSString *)rom;
 @end

iOS/GBROMManager.m

@@ -160,4 +160,11 @@
     return friendlyName;
 }
 
+- (void)deleteROM:(NSString *)rom
+{
+    NSString *root = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true).firstObject;
+    NSString *romDirectory = [root stringByAppendingPathComponent:rom];
+    [[NSFileManager defaultManager] removeItemAtPath:romDirectory error:nil];
+}
+
 @end

iOS/GBViewController.m

@@ -107,6 +107,7 @@ static void rumbleCallback(GB_gameboy_t *gb, double amp)
     
     [self initGameBoy];
     _gbView = _backgroundView.gbView;
+    _gbView.hidden = true;
     _gbView.gb = &_gb;
     [_gbView screenSizeChanged];
     
@@ -149,6 +150,10 @@ static void rumbleCallback(GB_gameboy_t *gb, double amp)
             [self loadState:[GBROMManager sharedManager].autosaveStateFile];
         }
     }
+    else {
+        _romLoaded = false;
+    }
+    _gbView.hidden = !_romLoaded;
 }
 
 - (void)applicationDidBecomeActive:(UIApplication *)application
@@ -174,7 +179,13 @@ static void rumbleCallback(GB_gameboy_t *gb, double amp)
 
 - (void)openLibrary
 {
-    [self presentViewController:[[GBLoadROMTableViewController alloc] init]
+    UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:[[GBLoadROMTableViewController alloc] init]];
+    UIBarButtonItem *close = [[UIBarButtonItem alloc] initWithTitle:@"Close"
+                                                             style:UIBarButtonItemStylePlain
+                                                             target:self
+                                                             action:@selector(dismissViewController)];
+    [controller.visibleViewController.navigationItem setLeftBarButtonItem:close];
+    [self presentViewController:controller
                        animated:true
                      completion:nil];
 }
@@ -227,6 +238,11 @@ static void rumbleCallback(GB_gameboy_t *gb, double amp)
     }];
 }
 
+- (void)dismissViewController
+{
+    [self dismissViewControllerAnimated:true completion:nil];
+}
+
 - (void)applicationWillResignActive:(UIApplication *)application
 {
     [self stop];