Obj-C snippets for sanity and profit

// check existence of a local file within an app bundle -------------------------------------

NSString *soundFile = @"sound.wav";
NSFileManager* manager;
manager = [NSFileManager defaultManager];
if([manager fileExistsAtPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:soundFile]])
    printf("file Exists...\n\n");
else
    printf("File not exist...\n\n");


// Load an AVAudioPlayer --------------------------------------------------------------------

NSError* err = nil;
self.beepCountdown = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"beep-2.wav"]] error:err];
if( err ) NSLog(@"Failed to load audio because: %@", [err localizedDescription]);

// play it
self.beepCountdown.delegate = self;
self.beepCountdown.numberOfLoops = 0;
[self.beepCountdown prepareToPlay];
[self.beepCountdown play];


// Make AVAudioPlayer play nice with video recording ----------------------------------------
// from: http://stackoverflow.com/questions/11785767/avaudioplayer-breaking-video-capture?rq=1

- (void)setupAudioSession {
    static BOOL audioSessionSetup = NO;
    if (audioSessionSetup) return;
    
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error: nil];
    UInt32 doSetProperty = 1;
    AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(doSetProperty), &doSetProperty);
    [[AVAudioSession sharedInstance] setActive: YES error: nil];
    
    audioSessionSetup = YES;
}


// route all audio through speakers - disregard devices plugged into headhpone jack -----------

- (void)setupAudioSession
{
    // Called once to route all audio through speakers, even if something's plugged into the headphone jack
    static BOOL audioSessionSetup = NO;
    if (audioSessionSetup) return;
    
    [[AVAudioSession sharedInstance] setDelegate:self];
    [[AVAudioSession sharedInstance] setActive: YES error: nil];
    
    // set category to accept properties assigned below
    NSError *sessionError = nil;
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error: &sessionError];     // withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker
    
    // Force audio to come out of speaker
    [[AVAudioSession sharedInstance] overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:nil];
    
    // fix issue with audio interrupting video recording - allow audio to mix on top of other media
    UInt32 doSetProperty = 1;
    AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(doSetProperty), &doSetProperty);
    
    // set flag
    audioSessionSetup = YES;
}


// save and restore a value from disk -------------------------------------------------------------------

// save
[[NSUserDefaults standardUserDefaults] setBool:self.buttonStayLoggedIn.selected forKey:STAY_LOGGED_IN_PREF_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];

// restore
BOOL storedValue = [[NSUserDefaults standardUserDefaults] boolForKey:STAY_LOGGED_IN_PREF_KEY];
if(storedValue == YES) self.buttonStayLoggedIn.selected = YES;



// add a nice rounded border to a UITextField -----------------------------------------------------------
self.inputPassword.borderStyle = UITextBorderStyleNone;
self.inputPassword.layer.cornerRadius = 4.0f;
self.inputPassword.layer.borderColor = [UIColor colorWithRed:217/255.f green:217/255.f blue:217/255.f alpha:1].CGColor;
self.inputPassword.layer.borderWidth = 1.0f;


// force a view update (maybe?) -------------------------------------------------------------------------
CFRunLoopRunInMode (CFRunLoopCopyCurrentMode(CFRunLoopGetCurrent()), 0, FALSE);
[[NSRunLoop currentRunLoop] runMode: NSDefaultRunLoopMode beforeDate: [NSDate date]];
[CATransaction flush];


// backwards-compatible check for iOS 7 -----------------------------------------------------------------
+ (BOOL)isIOS7
{
    return ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7);
}