OptionsController.m

/*
     File: OptionsController.m
 Abstract: Controller to set various debugging options.
  Version: 1.1
 
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 */
 
#import "OptionsController.h"
 
// OptionCell is a trivial subclass of UITableViewCell that allows us 
// to set the option key in IB via the "user defined runtime attributes" 
// inspector.
 
@interface OptionCell : UITableViewCell
 
@property (nonatomic, copy,   readwrite) NSString * optionKey;
 
@end
 
@implementation OptionCell
 
@end
 
@interface OptionsController ()
 
@property (nonatomic, strong, readwrite) IBOutletCollection(OptionCell) NSArray *   optionCells;
 
@property (nonatomic, strong, readwrite) NSMutableDictionary *      currentState;    // NSString -> NSNumber (Boolean)
 
@end
 
@implementation OptionsController
 
- (void)viewDidLoad
{
    NSUserDefaults *    defaults;
 
    [super viewDidLoad];
    
    self.currentState = [[NSMutableDictionary alloc] init];
    assert(self.currentState != nil);
    
    defaults = [NSUserDefaults standardUserDefaults];
    for (OptionCell * cell in self.optionCells) {
        BOOL        optionEnabled;
        
        optionEnabled = [defaults boolForKey:cell.optionKey];
        self.currentState[cell.optionKey] = @(optionEnabled);
        cell.accessoryType = optionEnabled ? UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone;
    }
}
 
- (void)tableView:(UITableView *)tv didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    #pragma unused(tv)
    #pragma unused(indexPath)
    OptionCell *        cell;
    BOOL                optionEnabled;
 
    assert(tv == self.tableView);
    assert(indexPath != NULL);
 
    cell = (OptionCell *) [self.tableView cellForRowAtIndexPath:indexPath];
    assert([cell isKindOfClass:[OptionCell class]]);
 
    optionEnabled = ! [self.currentState[cell.optionKey] boolValue];
    self.currentState[cell.optionKey] = @(optionEnabled);
 
    cell.accessoryType  = optionEnabled ? UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone;
 
    [self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}
 
- (IBAction)saveAction:(id)sender
{
    #pragma unused(sender)
    NSUserDefaults *                defaults;
    id<OptionsControllerDelegate>   strongDelegate;
 
    // Commit the options to the user defaults.
    
    defaults = [NSUserDefaults standardUserDefaults];
    assert(defaults != nil);
    
    for (NSString * key in self.currentState) {
        [defaults setObject:self.currentState[key] forKey:key];
    }
 
    [defaults synchronize];
    
    // Tell the delegate about the save.
 
    strongDelegate = self.delegate;
    [strongDelegate didSaveOptions:self];
}
 
- (IBAction)cancelAction:(id)sender
{
    #pragma unused(sender)
    id<OptionsControllerDelegate>   strongDelegate;
 
    // Tell the delegate about the cancellation.
 
    strongDelegate = self.delegate;
    [strongDelegate didCancelOptions:self];
}
 
@end