我正在从我的照片库中获取图像，并根据资产的日期属性，将这些图像排列在不同的文件夹中。我想做的是从照片库中获取图像，根据日期存储它们。例如，如果获取的图像来自 4 月 23 日，则将它们存储在“April”文件夹中。我为此使用 WSAssetPickerController。请帮助我解决内存问题，因为我的应用程序由于设备上的内存问题而崩溃，这在模拟器中运行良好。
- (void)storePhotos:(NSArray *)assets {
int index = 0;
for (ALAsset *asset in assets) {
NSLog(@"Current asset :%@ ",asset);
NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents"]];
NSDateFormatter *format = [[NSDateFormatter alloc] init];
[format setDateFormat:@"MMMM dd, yyyy"];
NSString *photoDate = [format stringFromDate:[asset valueForProperty:ALAssetPropertyDate]];
resourceDocPath = [resourceDocPath stringByAppendingPathComponent:photoDate];
// Create directory & Check directory
BOOL checkDir = [self createDocumentDirectory:resourceDocPath fileName:asset.defaultRepresentation.filename];
if (!checkDir) {
continue;
}
// Write image
NSString *writablePhotoPath = [resourceDocPath stringByAppendingPathComponent:asset.defaultRepresentation.filename];
[self writeImage:writablePhotoPath WithImage:asset.defaultRepresentation.fullScreenImage];
index++;
}
}
- (void)writeImage:(NSString*)pstrPhotoPath WithImage:(CGImageRef)pImage {
if (![[NSFileManager defaultManager] fileExistsAtPath:pstrPhotoPath]){
UIImage *image = [[UIImage alloc] initWithCGImage:pImage];
NSData *imageData = UIImagePNGRepresentation(image);
[imageData writeToFile:pstrPhotoPath atomically:YES];
}
}
- (BOOL)createDocumentDirectory:(NSString*) pCurrentFolder fileName:(NSString*) pStrFileName {
if (![[NSFileManager defaultManager] fileExistsAtPath:pCurrentFolder]){
if ([self checkPhotoIsExistInDocument:pStrFileName]) {
return FALSE;
}
NSError* error;
if ([[NSFileManager defaultManager] createDirectoryAtPath:pCurrentFolder withIntermediateDirectories:NO attributes:nil error:&error]) {
// success
return TRUE;
} else {
NSLog(@"[%@] ERROR: attempting to write create MyFolder directory", [self class]);
NSAssert( FALSE, @"Failed to create directory maybe out of disk space?");
return TRUE;
}
return TRUE;
} else {
return TRUE;
}
}
- (BOOL)checkPhotoIsExistInDocument:(NSString*) pStrImageName {
NSString *bundleRoot = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents"]];
NSFileManager *manager = [NSFileManager defaultManager];
NSDirectoryEnumerator *direnum = [manager enumeratorAtPath:bundleRoot];
NSString *filename;
while ((filename = [direnum nextObject] )) {
// NSLog(@"%@", filename);
if ([filename hasSuffix:pStrImageName]) {
return TRUE;
}
}
return FALSE;
}