IOS照相机的启动，图片的读取，存储demo

#import

@interface ViewController : UIViewController
@property (retain, nonatomic) IBOutlet UIImageView *imgV;
- (IBAction)openCamera:(id)sender;

- (IBAction)openPhotoLibrary:(id)sender;

- (IBAction)openSavedPhotoAlbum:(id)sender;

@end

#import "ViewController.h"

@implementation ViewController
@synthesize imgV;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [self setImgV:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

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

- (IBAction)openCamera:(id)sender
{
    //UIImagePickerController 类方法，判断源是否可用 UIImagePickerController是一个图片挑选控制器 可以通过三种途径挑选图片。Camera、PhotoLibrary、SavedPhotoAlbum
    BOOL hasCamera = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];//判断照相机是否可用（是否有摄像头）
    if(hasCamera == YES)
    {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        picker.delegate = self;
        picker.allowsEditing = YES; //是否可编辑
        [self presentModalViewController:picker animated:YES];
        [picker release];
    }
    else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"你没有摄像头" delegate:nil cancelButtonTitle:@"ok!" otherButtonTitles:nil];
        [alert show];
        [alert release];
    }
   
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSLog(@"%@",info);
//    {
//        UIImagePickerControllerCropRect = "NSRect: {{-1, 320}, {1937, 1937}}";
//        UIImagePickerControllerEditedImage = "";
//        UIImagePickerControllerMediaMetadata =     {
//            DPIHeight = 72;
//            DPIWidth = 72;
//            Orientation = 6;
//            "{Exif}" =         {
//                ApertureValue = "2.970853654340484";
//                BrightnessValue = "2.246098001053075";
//                ColorSpace = 1;
//                DateTimeDigitized = "2012:09:20 11:47:12";
//                DateTimeOriginal = "2012:09:20 11:47:12";
//                ExposureMode = 0;
//                ExposureProgram = 2;
//                ExposureTime = "0.06666666666666667";
//                FNumber = "2.8";
//                Flash = 24;
//                FocalLength = "3.85";
//                ISOSpeedRatings =             (
//                                               125
//                                               );
//                MeteringMode = 5;
//                PixelXDimension = 2592;
//                PixelYDimension = 1936;
//                SceneType = 1;
//                SensingMethod = 2;
//                Sharpness = 2;
//                ShutterSpeedValue = "3.911199862602335";
//                SubjectArea =             (
//                                           1295,
//                                           967,
//                                           699,
//                                           696
//                                           );
//                WhiteBalance = 0;
//            };
//            "{TIFF}" =         {
//                DateTime = "2012:09:20 11:47:12";
//                Make = Apple;
//                Model = "iPhone 4";
//                Software = "5.1.1";
//                XResolution = 72;
//                YResolution = 72;
//            };
//        };
//        UIImagePickerControllerMediaType = "public.image";
//        UIImagePickerControllerOriginalImage = "";
//    }
    UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
    imgV.image = image;
   
    //如果想把某个UIImage对象存储到默认相册，使用下面代码
    //UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

[self dismissModalViewControllerAnimated:YES];

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [self dismissModalViewControllerAnimated:YES];
}

- (IBAction)openPhotoLibrary:(id)sender //相册列表
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    picker.allowsEditing = YES; //是否可编辑
    [self presentModalViewController:picker animated:YES];
    [picker release];
}

- (IBAction)openSavedPhotoAlbum:(id)sender //默认相册
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    picker.delegate = self;
    picker.allowsEditing = YES; //是否可编辑
    [self presentModalViewController:picker animated:YES];
    [picker release];

}
- (void)dealloc {
    [imgV release];
    [super dealloc];
}
@end