비디오파일 duration 가져오기

- (NSString *)getVideoFileDuration:(NSString *)fileName {

    NSString *videoFilePath = [[self localVideoStorageDir] stringByAppendingPathComponent:fileName];

    NSURL *url = [NSURL fileURLWithPath:videoFilePath];

    AVURLAsset *sourceAsset = [AVURLAsset URLAssetWithURL:url options:nil];

    CMTime duration = sourceAsset.duration;

    NSInteger seconds = (int)CMTimeGetSeconds(duration);

    

    NSDate* date = [NSDate dateWithTimeIntervalSince1970:seconds];

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

    [dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];

    if (seconds >= 360) {

        [dateFormatter setDateFormat:@"HH:mm:ss"];

    } else{

        [dateFormatter setDateFormat:@"mm:ss"];

    }

    NSString* result = [dateFormatter stringFromDate:date];

    return result;

}

이미지 파일의 정보 가져오기

- (IBAction)touchedImageInfo:(id)sender {

    

    NSData *imagedata = [NSData dataWithContentsOfFile:_fileUrl];

    CGImageSourceRef source = CGImageSourceCreateWithData((CFMutableDataRef)imagedata, NULL);

    CFDictionaryRef dictRef = CGImageSourceCopyPropertiesAtIndex(source,0,NULL);

    NSDictionary* metadata = (__bridge NSDictionary *)dictRef;

    

    //NSLog(@"%@", metadata);

    CGFloat width = [metadata[@"PixelWidth"] floatValue];

    CGFloat height = [metadata[@"PixelHeight"] floatValue];

    

    NSMutableString *message = [[NSMutableString alloc] init];

    [message appendFormat:@"\n종류 : %@\n", [_fileUrl pathExtension]];

    [message appendFormat:@"크기 : %.01f KB\n", (float)imagedata.length/1024.f];

    [message appendFormat:@"해상도 : %d x %d\n", (int)width, (int)height];

    

    UIAlertController * alert = [UIAlertController

                                 alertControllerWithTitle:@"파일 정보"

                                 message:message

                                 preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* yesButton = [UIAlertAction

                                actionWithTitle:@"확인"

                                style:UIAlertActionStyleDefault

                                handler:^(UIAlertAction * action) {

                                }];

    [alert addAction:yesButton];

    [[Util topViewController] presentViewController:alert animated:YES completion:^{

        CFRelease(source);

        CFRelease(dictRef);

    }];

}

겔러리에 이미지/비디오 저장 하기 over iOS 8

#import <Photos/Photos.h>

- (IBAction)touchedImageSave:(id)sender {

    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

        PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:_imageView.image];

        changeRequest.creationDate          = [NSDate date];

    } completionHandler:^(BOOL success, NSError *error) {

        if (success) {

            [[Util sharedInstance] showToastMessage:@"저장되었습니다."];

        }

        else {

            [[Util sharedInstance] showToastMessage:[NSString stringWithFormat:@"저장에 실패했습니다. (%@)", error.localizedDescription]];

        }

    }];

}

- (IBAction)touchedVideoSave:(id)sender {

    

    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^

     {

         NSURL *url = [NSURL URLWithString:_fileUrl];

         [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:url];

     }

                                      completionHandler:^(BOOL success, NSError *error)

     {

         if (success) {

             [[Util sharedInstance] showToastMessage:@"저장되었습니다."];

         }

         else {

             [[Util sharedInstance] showToastMessage:[NSString stringWithFormat:@"저장에 실패했습니다. (%@)", error.localizedDescription]];

         }

     }];

}

겔러리에서 모든 이미지 불러오기

-(void)getAllPhotos

{

    [[Util sharedInstance] showLoadingView];

    

    NSMutableArray *photos = [[NSMutableArray alloc] init];

    PHFetchOptions *allPhotosOptions = [[PHFetchOptions alloc] init];

    allPhotosOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];

    PHFetchResult *allPhotos = [PHAsset fetchAssetsWithOptions:allPhotosOptions];

    PHFetchResult *fetchResult = @[allPhotos][0];

    

    for (int x = 0; x < fetchResult.count; x ++) {

        

        PHAsset *asset = fetchResult[x];

        photos[x] = asset;

    }

    

    self.assets = photos;

    

    [[Util sharedInstance] hideLoadingView];

    [_collectionView reloadData];

}

- (void)viewDidLoad {

    [super viewDidLoad];

    

    self.selectedAssets = [[NSMutableArray alloc] init];

    self.assets = [[NSMutableArray alloc] init];

    

    self.manager = [PHImageManager defaultManager];

    self.options = [[PHImageRequestOptions alloc] init];

    _options.resizeMode = PHImageRequestOptionsResizeModeFast;

    _options.deliveryMode = PHImageRequestOptionsDeliveryModeFastFormat;

    

    [self requestAuthorizationWithRedirectionToSettings];

    

    //[self performSelector:@selector(getAllPhotos) withObject:nil];

}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    

    BoardPhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"BoardPhotoCell" forIndexPath:indexPath];

    

    cell.checkIndicator.hidden = NO;

    PHAsset *asset = [_assets objectAtIndex:indexPath.item];

    [_manager requestImageForAsset:asset

                       targetSize:CGSizeMake(1024.f,1024.f)

                      contentMode:PHImageContentModeDefault

                          options:_options

                    resultHandler:^void(UIImage *image, NSDictionary *info) {

                        cell.photo.image = image;

                    }];

    

    //update checkbox

    NSUInteger foundIndex = [_selectedAssets indexOfObject:asset];

    if (foundIndex != NSNotFound) {

        [cell setCheck:YES];

    } else {

        [cell setCheck:NO];

    }

    

    return cell;

}

갤러리 권한 요청

- (void)requestAuthorizationWithRedirectionToSettings {
    dispatch_async(dispatch_get_main_queue(), ^{
        PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
        if (status == PHAuthorizationStatusAuthorized)
        {
            //We have permission. Do whatever is needed
        }
        else
        {
            //No permission. Trying to normally request it
            [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
                if (status != PHAuthorizationStatusAuthorized)
                {
                    //User don't give us permission. Showing alert with redirection to settings
                    //Getting description string from info.plist file
                    NSString *accessDescription = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSPhotoLibraryUsageDescription"];
                    UIAlertController * alertController = [UIAlertController alertControllerWithTitle:accessDescription message:@"To give permissions tap on 'Change Settings' button" preferredStyle:UIAlertControllerStyleAlert];

                    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:nil];
                    [alertController addAction:cancelAction];

                    UIAlertAction *settingsAction = [UIAlertAction actionWithTitle:@"Change Settings" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
                    }];
                    [alertController addAction:settingsAction];

                    [[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:alertController animated:YES completion:nil];
                }
            }];
        }
    });
}

출처 : http://stackoverflow.com/questions/13572220/ask-permission-to-access-camera-roll