读取照片的Exif信息 博客分类: iOS iPhoneIOSExif
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2024-02-14 19:14:58
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首先,将AssetsLibrary.framework、CoreLocation.framework和ImageIO.framework加入到项目中。
PhotoLibViewController.h
#import <UIKit/UIKit.h> #import <AssetsLibrary/AssetsLibrary.h> @interface PhotoLibViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate> { } - (IBAction)toGetImage:(id)sender; @end
PhotoLibViewController.m
#import "PhotoLibViewController.h" #import "PhotoLibImageInfoController.h" #import "HHLocationManager.h" #import <ImageIO/ImageIO.h> @implementation PhotoLibViewController - (NSMutableDictionary *)updateExif:(CLLocation *)currentLocation{ NSMutableDictionary *locDict = [[NSMutableDictionary alloc] init]; CLLocationDegrees exifLatitude = currentLocation.coordinate.latitude; CLLocationDegrees exifLongitude = currentLocation.coordinate.longitude; [locDict setObject:currentLocation.timestamp forKey:(NSString *)kCGImagePropertyGPSTimeStamp]; if (exifLatitude < 0.0) { exifLatitude = exifLatitude * (-1); [locDict setObject:@"S" forKey:(NSString *)kCGImagePropertyGPSLatitudeRef]; } else { [locDict setObject:@"N" forKey:(NSString *)kCGImagePropertyGPSLatitudeRef]; } [locDict setObject:[NSNumber numberWithFloat:exifLatitude] forKey:(NSString *)kCGImagePropertyGPSLatitude]; if (exifLongitude < 0.0) { exifLongitude = exifLongitude * (-1); [locDict setObject:@"W" forKey:(NSString *)kCGImagePropertyGPSLongitudeRef]; } else { [locDict setObject:@"E" forKey:(NSString *)kCGImagePropertyGPSLongitudeRef]; } [locDict setObject:[NSNumber numberWithFloat:exifLongitude] forKey:(NSString *) kCGImagePropertyGPSLongitude]; return [locDict autorelease]; } - (void)dealloc { [super dealloc]; } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; } - (void)viewDidUnload { [super viewDidUnload]; } #pragma mark - IBAction - (IBAction)toGetImage:(id)sender { UIButton *button = (UIButton *)sender; UIImagePickerController *iconPickerController = [[UIImagePickerController alloc] init]; if (button.tag == 51) { iconPickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; } else if (button.tag == 50) { iconPickerController.sourceType = UIImagePickerControllerSourceTypeCamera; iconPickerController.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto; iconPickerController.showsCameraControls = YES; } iconPickerController.delegate = self; [self presentModalViewController:iconPickerController animated:YES]; [[HHLocationManager shared] startStandardUpdates]; [iconPickerController release]; } #pragma mark UIImagePickerControllerDelegate - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType]; if (![mediaType isEqualToString:@"public.image"]) { return; } NSURL *imageURL = [info objectForKey:UIImagePickerControllerReferenceURL]; ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; CGImageRef imageRef = [[info objectForKey:UIImagePickerControllerOriginalImage] CGImage]; typedef void (^ALAssetsLibraryAssetForURLResultBlock)(ALAsset *asset); typedef void (^ALAssetsLibraryAccessFailureBlock)(NSError *error); typedef void (^ALAssetsLibraryWriteImageCompletionBlock)(NSURL *assetURL, NSError *error); ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset) { ALAssetRepresentation *rep = [myasset defaultRepresentation]; CGImageRef iref = [rep fullResolutionImage]; PhotoLibImageInfoController *imageInfo = [[PhotoLibImageInfoController alloc] initWithNibName:@"PhotoLibImageInfoController" bundle:nil]; imageInfo.image = [UIImage imageWithCGImage:iref]; imageInfo.imageInfo = [rep metadata]; NSLog(@"ALAssetRepresentation: %@", [rep metadata]); [self.navigationController pushViewController:imageInfo animated:YES]; [imageInfo release]; [library release]; }; ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror) { NSLog(@"Error, cant get image - %@", [myerror localizedDescription]); [library release]; }; ALAssetsLibraryWriteImageCompletionBlock completionblock = ^(NSURL *assetURL, NSError *error) { [library assetForURL:assetURL resultBlock:resultblock failureBlock:failureblock]; NSLog(@"Error, cant save image - %@", [error localizedDescription]); }; if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) { NSDictionary *gpsDict = [self updateExif:[[HHLocationManager shared] thisLocation]]; NSMutableDictionary *imageMetaData = [NSMutableDictionary dictionary]; [imageMetaData setObject:gpsDict forKey:(NSString *)kCGImagePropertyGPSDictionary]; [library writeImageToSavedPhotosAlbum:imageRef metadata:imageMetaData completionBlock:completionblock]; } else { [library assetForURL:imageURL resultBlock:resultblock failureBlock:failureblock]; } [picker performSelector:@selector(dismissModalViewControllerAnimated:) withObject:[NSNumber numberWithBool:YES] afterDelay:1.0]; } @end
PhotoLibImageInfoController.h
#import <UIKit/UIKit.h> @interface PhotoLibImageInfoController : UIViewController { } @property (nonatomic, retain) IBOutlet UIImageView *imageView; @property (nonatomic, retain) IBOutlet UITextView *info; @property (nonatomic, retain) NSDictionary *imageInfo; @property (nonatomic, retain) UIImage *image; @end
PhotoLibImageInfoController.m
#import "PhotoLibImageInfoController.h" @implementation PhotoLibImageInfoController @synthesize imageView, info, imageInfo, image; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { imageInfo = [[NSDictionary alloc] init]; image = [[UIImage alloc] init]; } return self; } - (void)dealloc { [image release]; [imageInfo release]; [imageView release]; [info release]; [super dealloc]; } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; if (image) self.imageView.image = image; if (imageInfo) self.info.text = [imageInfo description]; } - (void)viewDidUnload { [super viewDidUnload]; } @end
示例输出:
{ ColorModel = RGB; DPIHeight = 100; DPIWidth = 100; Depth = 8; PixelHeight = 120; PixelWidth = 120; "{Exif}" = { ColorSpace = 1; ComponentsConfiguration = ( 1, 2, 3, 0 ); ExifVersion = ( 2, 2, 1 ); FlashPixVersion = ( 1, 0 ); PixelXDimension = 120; PixelYDimension = 120; SceneCaptureType = 0; }; "{GPS}" = { Latitude = "31.2795"; LatitudeRef = N; Longitude = "120.7431666666667"; LongitudeRef = E; }; "{TIFF}" = { ResolutionUnit = 2; XResolution = 100; YResolution = 100; "_YCbCrPositioning" = 1; }; }
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