这段代码在两周前运行良好......突然停止工作，我不知道为什么。
这些是在 中调用的相关方法viewDidLoad：
在 viewDidLoad 中调用：
if(!self.currentProject.assets){
[self fetchAssets];
[self fetchImagesFromAssets:nil];
}else {
NSArray *assets = [NSKeyedUnarchiver unarchiveObjectWithData:self.currentProject.assets];
[self fetchImagesFromAssets:assets.mutableCopy];
}
方法：
-(void) fetchAssets{
self.assets = [[PHFetchResult alloc]init];
NSLog(@"Album Name:%@",self.albumName);
if (self.albumName.length > 0) {
PHFetchResult *userAlbums = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[self.albumName] options:nil];
PHAssetCollection *collection = userAlbums[0];
if (!_isProUser) {
PHFetchOptions *onlyImagesOptions = [PHFetchOptions new];
onlyImagesOptions.predicate = [NSPredicate predicateWithFormat:@"mediaType = %i", PHAssetMediaTypeImage];
NSLog(@"Collection:%@", collection.localIdentifier);
self.assets = [PHAsset fetchAssetsInAssetCollection:collection options:onlyImagesOptions];
}
else
{
self.assets = [PHAsset fetchAssetsInAssetCollection:collection options:nil];
}
}else{
PHFetchOptions *options = [PHFetchOptions new];
options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
if(!_isProUser){
options.predicate = [NSPredicate predicateWithFormat:@"mediaType = %i", PHAssetMediaTypeImage];
}
self.assets = [PHAsset fetchAssetsWithOptions:options];
}
}
-(void) fetchImagesFromAssets:(NSMutableArray*)assets{
if (assets == nil) {
assets = [[NSMutableArray alloc]init];
for (int i = (int)self.firstPhotoIndex; i < (int)self.lastPhotoIndex; i++) {
[assets addObject:[self.assets objectAtIndex:i]];
}
}
self.photosToVideofy = [[NSMutableArray alloc]init];
NSLog(@"Assets:%lu",(unsigned long)assets.count);
for (PHAsset *asset in assets)
{
if (!_isProUser) {
[asset requestContentEditingInputWithOptions:nil
completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
NSURL *imageURL = contentEditingInput.fullSizeImageURL;
NSLog(@"ImageURL:%@", imageURL);
[self.photosToVideofy addObject:imageURL];
}];
}else{
if (asset.mediaType == PHAssetMediaTypeVideo) {
[self generateImagesFromAsset:asset];
}else if (asset.mediaType == PHAssetMediaTypeImage){
[asset requestContentEditingInputWithOptions:nil
completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
NSURL *imageURL = contentEditingInput.fullSizeImageURL;
[self.photosToVideofy addObject:imageURL];
NSLog(@"ImageURL:%@", imageURL);
}];
}
}
}
assets = nil;
NSLog(@"There are %lu photos to Videofy", (unsigned long)self.photosToVideofy.count);
}
-(void) generateImagesFromAsset:(PHAsset *)phAsset{
NSLog(@"Generating images from video...");
[[PHImageManager defaultManager]requestAVAssetForVideo:phAsset options:nil resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
generator.requestedTimeToleranceAfter = kCMTimeZero;
generator.requestedTimeToleranceBefore = kCMTimeZero;
generator.maximumSize = self.size;
int j = 1;
for (Float64 i = 0; i < CMTimeGetSeconds(asset.duration) * _FPS ; i++){
@autoreleasepool {
CMTime time = CMTimeMake(i, _FPS);
NSError *err;
CMTime actualTime;
CGImageRef image = [generator copyCGImageAtTime:time actualTime:&actualTime error:&err];
UIImage *generatedImage = [[UIImage alloc] initWithCGImage:image];
[self saveImage: generatedImage withIndex:self.generatedPhotoIndex]; // Saves the image on document directory and not memory
CGImageRelease(image);
}
j++;
self.generatedPhotoIndex++;
}
}];
}
-(void) saveImage:(UIImage*)image withIndex:(int)index{
NSData *pngData = UIImagePNGRepresentation(image);
NSString *path = [self documentsPathForFileName:[NSString stringWithFormat:@"image%i.png",index]];
NSURL *url = [NSURL URLWithString:path];
[pngData writeToFile:path atomically:YES]; //Write the file
NSLog(@"URL:%@",url);
[self.photosToVideofy addObject:url];
}
-(NSString *)documentsPathForFileName:(NSString *)name{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
return [documentsPath stringByAppendingPathComponent:name];
}
我将问题缩小到photosToVideofy数组。它不会像 2 周前那样填充 URL。
这是控制台的读数：
2015-09-03 11:14:44.899 Videofy[885:110958] First:6 Last:175 BPM:120
2015-09-03 11:14:48.891 Videofy[885:110958] Album Name:(null)
2015-09-03 11:14:51.406 Videofy[885:110958] Assets:169
2015-09-03 11:14:51.436 Videofy[885:110958] Generating images from video...
2015-09-03 11:14:51.460 Videofy[885:110958] Generating images from video...
2015-09-03 11:14:51.461 Videofy[885:110958] Generating images from video...
2015-09-03 11:14:51.465 Videofy[885:110958] Generating images from video...
2015-09-03 11:14:51.472 Videofy[885:110958] Generating images from video...
2015-09-03 11:14:51.474 Videofy[885:110958] There are 0 photos to Videofy
关于为什么会发生这种情况以及如何解决它的任何想法？（在 iPhone 4s 和 iPad4 上测试）