#import <AssetsLibrary/AssetsLibrary.h> // must be imported
// original image path
#define KOriginalPhotoImagePath
[[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"OriginalPhotoImages"]
// video URL path
#define KVideoUrlPath
[[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"VideoURL"]
// caches path
#define KCachesPath
[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0]
// MainViewController
@interface MTHMainViewController ()
@property (nonatomic,strong) MTHNextViewController *nextVC;
@property (nonatomic,strong) NSMutableArray *groupArrays;
@property (nonatomic,strong) UIImageView *litimgView;
@end
@implementation MTHMainViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.navigationItem.title = @"Demo";
self.view.backgroundColor = [UIColor clearColor];
// initialize
self.groupArrays = [NSMutableArray array];
// test BarItem
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"测试" style:UIBarButtonItemStylePlain target:self action:@selector(testRun)];
// test gesture
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(didClickPanGestureRecognizer:)];
[self.navigationController.view addGestureRecognizer:panRecognizer];
// Thumbnail display of image or video
self.litimgView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 120, 120)];
[self.view addSubview:_litimgView];
}
- (void) testRun
{
__weak MTHMainViewController *weakSelf = self;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^ (ALAssetsGroup * group, BOOL * stop) {
if (group != nil) {
[weakSelf.groupArrays addObject:group];
} else {
[weakSelf.groupArrays enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
[obj enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if ([result thumbnail] != nil) {
// Photo
if ([[result valueForProperty: ALAssetPropertyType] isEqualToString: ALAssetTypePhoto]) {
NSDate *date= [result valueForProperty:ALAssetPropertyDate];
UIImage *image = [UIImage imageWithCGImage:[result thumbnail]];
NSString *fileName = [[result defaultRepresentation] filename];
NSURL *url = [[result defaultRepresentation] url];
int64_t fileSize = [[result defaultRepresentation] size];
NSLog(@"date = %@",date);
NSLog(@"fileName = %@",fileName);
NSLog(@"url = %@",url);
NSLog(@"fileSize = %lld",fileSize);
// Remember to put the UI update on the main thread, otherwise it will be very slow if you wait for the sub-threads to queue up and you won't know the age.
dispatch_async(dispatch_get_main_queue(), ^{
self.litimgView.image = image;
});
}
// video
else if ([[result valueForProperty: ALAssetPropertyType] isEqualToString: ALAssetTypeVideo]) {
// Similar to the image method
}
}
}];
}];
}
};
ALAssetsLibraryAccessFailureBlock failureBlock = ^(NSError *error)
{
NSString *errorMessage = nil;
switch ([error code]) {
case ALAssetsLibraryAccessUserDeniedError:
case ALAssetsLibraryAccessGloballyDeniedError:
errorMessage = @"The user refuses to access the album, please enable it in <Privacy>";
break;
default:
errorMessage = @"Reason unknown.";
break;
}
dispatch_async(dispatch_get_main_queue(), ^{
UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Error, cannot access!"
message:errorMessage
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles: nil, nil];
[alertView show];
});
};
ALAssetsLibrary * assetsLibrary = [[ALAssetsLibrary alloc] init];
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:listGroupBlock failureBlock:failureBlock];
});
}
The path directly taken out according to the above method cannot be transmitted, and must be converted into an NSData object and re-written to the sandbox path
// Convert the URL of the original image into NSData data and write it into the sandbox
- (void)imageWithUrl:(NSURL *)url withFileName:(NSString *)fileName
{
// You should also add judgment when entering this method. If it has been converted, don't call this method.
// How to judge that it has been converted, by whether there is a file path
ALAssetsLibrary * assetLibrary = [[ALAssetsLibrary alloc] init];
// Create a folder to store the original images--->OriginalPhotoImages
NSFileManager * fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:KOriginalPhotoImagePath]) {
[fileManager createDirectoryAtPath:KOriginalPhotoImagePath withIntermediateDirectories:YES attributes:nil error:nil];
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
if (url) {
// main method
[assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) {
ALAssetRepresentation * rep = [asset defaultRepresentation];
Byte *buffer = (Byte*)malloc((unsigned long)rep.size);
NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:((unsigned long)rep.size) error:nil];
NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];
NSString * imagePath = [KOriginalPhotoImagePath stringByAppendingPathComponent:fileName];
[data writeToFile:imagePath atomically:YES];
} failureBlock:nil];
}
});
}
// Convert the URL of the original video into NSData data and write it into the sandbox
- (void)videoWithUrl:(NSURL *)url withFileName:(NSString *)fileName
{
// Analyze, why does the video not open up its own size of memory to write at one time like the picture?
// Think about it, if a video has more than 1G, is it possible to directly open up more than 1G of space to write?
ALAssetsLibrary * assetLibrary = [[ALAssetsLibrary alloc] init];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
if (url) {
[assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) {
ALAssetRepresentation * rep = [asset defaultRepresentation];
NSString * videoPath = [KCachesPath stringByAppendingPathComponent:fileName];
char const *cvideoPath = [videoPath UTF8String];
FILE *file = fopen(cvideoPath, "a+");
if (file) {
const int bufferSize = 1024 * 1024;
// Initialize a 1M buffer
Byte *buffer = (Byte*)malloc(bufferSize);
NSUInteger read = 0, offset = 0, written = 0;
NSError* err = nil;
if (rep.size != 0)
{
do {
read = [rep getBytes:buffer fromOffset:offset length:bufferSize error:&err];
written = fwrite(buffer, sizeof(char), read, file);
offset += read;
} while (read != 0 && !err);//No end, no error, ok continue
}
// free the buffer, close the file
free(buffer);
buffer = NULL;
fclose(file);
file = NULL;
}
} failureBlock:nil];
}
});
}