Check if various hardware components are available. source: professional iOS augmented reality dev.

augmented.m

//
//  FirstViewController.m
//  iOS_AR_Ch2_HardwareComparison
//
//  Created by Kyle Roche on 6/13/11.
//  Copyright 2011 Isidorey. All rights reserved.
//

#import "FirstViewController.h"


@implementation FirstViewController


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    // check for camera
    BOOL cameraAvailable = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
    // check for front facing camera
    BOOL frontCameraAvailable = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerCameraDeviceFront];
    
    if (cameraAvailable) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Camera" 
                                                        message:@"Camera Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Camera" 
                                                        message:@"Camera NOT Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
    
    if (frontCameraAvailable) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Camera" 
                                                        message:@"Front Camera Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Camera" 
                                                        message:@"Front Camera NOT Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
    
    // checking for video support
    if ([self isVideoCameraAvailable]) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Video" 
                                                        message:@"Video Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Video" 
                                                        message:@"Video NOT Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
    
    BOOL magnetometerAvailable = [CLLocationManager headingAvailable];
    if (magnetometerAvailable) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Magnetometer" 
                                                        message:@"Magnetometer Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Magnetometer" 
                                                        message:@"Magnetometer NOT Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
    if ([self isGyroscopeAvailable]) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Gyroscope" 
                                                        message:@"Gyroscope Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Gyroscope" 
                                                        message:@"Gyroscope NOT Available" 
                                                       delegate:self 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }

    [super viewDidLoad];
}

- (BOOL) isVideoCameraAvailable
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:picker.sourceType];
    [picker release];
    
    if (![sourceTypes containsObject:(NSString *)kUTTypeMovie]){
        
        return NO;
    }
    
    return YES;
}

- (BOOL) isGyroscopeAvailable 
{
#ifdef __IPHONE_4_0
    CMMotionManager *motionManager = [[CMMotionManager alloc] init];
    BOOL gyroscopeAvailable = motionManager.gyroAvailable;
    [motionManager release];
    return gyroscopeAvailable;
#else
    return NO;
#endif
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}


- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc. that aren't in use.
}


- (void)viewDidUnload
{
    [super viewDidUnload];

    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc
{
    [super dealloc];
}

@end