iOS_给保存到系统相册的视频添加位置信息

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录制结束后的视频要保存到系统相册，之前是不带位置信息的，现在要实现把视频保存到系统相册时添加上位置信息

直接上代码：

#pragma mark - 给视频添加GPS- (void)saveVideoToSystemAlbumWithPath:(NSString *)videoPath{    ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];    [library writeVideoAtPathToSavedPhotosAlbum:[NSURL URLWithString:videoPath] completionBlock:^(NSURL *assetURL, NSError *error) {                if (error) {                        NSLog(@"Save video to system Album failed:%@",error);        }else{                        [self addGPSToSavedVideo];                        NSLog(@"Save video to system album success!");        }    }];}- (void)addGPSToSavedVideo{        //支持ios8以上的版本    if ([PHAsset class]){        // 获取相册里所有的视频，并按视频的创建时间排序        PHFetchOptions *fetchOptions = [[PHFetchOptions alloc]init];        fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];        fetchOptions.fetchLimit = 1;        PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeVideo options:fetchOptions];        // 拿到最后一个视频资源 即最新的视频资源        PHAsset *lastAsset = [fetchResult lastObject];                [[PHImageManager defaultManager] requestImageForAsset:lastAsset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:nil resultHandler:^(UIImage *result, NSDictionary *info){                        if ([info objectForKey:PHImageErrorKey] == nil && ![[info objectForKey:PHImageResultIsDegradedKey] boolValue]) {                                NSArray *resources = [PHAssetResource assetResourcesForAsset:lastAsset];                NSString *orgFilename = ((PHAssetResource*)resources[0]).originalFilename;                //我们一旦拿到asset，就可以看到metadata信息                [lastAsset requestContentEditingInputWithOptions:nil completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {                    NSURL *imageURL = contentEditingInput.fullSizeImageURL;                    NSString *urlstring = [imageURL absoluteString];                    NSLog(@"Urlstring = %@",urlstring);                }];                                //用坐标和日期创建新的location                double latitude = [TVULocalManager getLatitude];                double longitude = [TVULocalManager getLongitude];                CLLocationCoordinate2D locationNew = CLLocationCoordinate2DMake(latitude,longitude);                NSDate *nowDate = [NSDate date];                CLLocation *newLocation = [[CLLocation alloc ]initWithCoordinate:locationNew altitude:0.0 horizontalAccuracy:1.0 verticalAccuracy:1.0 timestamp:nowDate];                                //我们请求更改metadata，并插入新的location                //当视频已经被保存的回调被触发时，将会把写的元数据写入视频                 [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{                    // 从要被修改元数据的Asset中创建修改请求                    PHAssetChangeRequest *request = [PHAssetChangeRequest changeRequestForAsset:lastAsset];                    // 设置请求的属性来改变Asset                    request.location = newLocation;                                    } completionHandler:^(BOOL success, NSError *error) {                                        NSLog(@"Finished updating asset. %@", (success ? @"Success." : error));                }];            }        }];                    }else {        //如果是iOS8之前的版本  暂时不支持添加位置信息        NSLog(@"Pre-iOS8 does not support adding GPS");    }}zhu

【注】要记得添加头文件

#import <AssetsLibrary/AssetsLibrary.h>

#import <Photos/Photos.h>

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