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

sqlite3에서 쿼리한결과 array로 리턴

+ (NSMutableArray *)doGetWordInfo:(NSString *)queryString

{

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

    const char *query_stmt = [queryString UTF8String];

    sqlite3_stmt    *statement;

    

    if (sqlite3_prepare_v2(gTheDb, query_stmt, -1, &statement, NULL) == SQLITE_OK)

    {

        int columnCount = sqlite3_column_count(statement);

        

        while (sqlite3_step(statement) == SQLITE_ROW)

        {

            NSMutableDictionary *entryDic = [[NSMutableDictionary alloc] init];

            

            for (int columnIndex=0; columnIndex<columnCount; columnIndex++) {

                NSNumber *tmpNumberValue=nil;

                NSString *tmpStringValue=@"";

                

                NSString *columnName = [NSString stringWithUTF8String:(const char *) sqlite3_column_name(statement, columnIndex)];

                

                int columnType = sqlite3_column_type(statement, columnIndex);

                if (columnType == SQLITE_INTEGER) {

                    tmpNumberValue =[NSNumber numberWithInt: sqlite3_column_int(statement, columnIndex)];

                    [entryDic setValue:tmpNumberValue forKey:columnName];

                } else if(columnType == SQLITE_TEXT) {

                    tmpStringValue = [NSString stringWithUTF8String:(const char *) sqlite3_column_text(statement, columnIndex)];

                    [entryDic setValue:tmpStringValue forKey:columnName];

                }

            }

            

            [entries addObject:entryDic];

            entryDic = nil;

        }

    }

    sqlite3_finalize(statement);

    return entries;

}

app설정의 notification 설정값 가져와서 업데이트 하기.

system setting에서 application의 notification 설정값을 변경하면,  application에서 그 값을 가져와 반영하는 방법.


1. uiviewcontroller에 notification 등록

[[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(applicationEnteredForeground:)

                                                 name:UIApplicationWillEnterForegroundNotification

                                               object:nil];

- (void)applicationEnteredForeground:(NSNotification *)notification {

    [self updateNotificationSound];

}

2. 설정값 가져오기 

- (void)updateNotificationSound

{

    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")){

        UIUserNotificationType type = [[[UIApplication sharedApplication] currentUserNotificationSettings] types];

        if (type & UIUserNotificationTypeSound){

            _notificationSettingValue.text = @"소리";

        } else {

            _notificationSettingValue.text = @"무음";

        }

    } else {

        UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];

        if (types & UIRemoteNotificationTypeSound) {

            _notificationSettingValue.text = @"소리";

        } else {

            _notificationSettingValue.text = @"무음";

        }

    }

}

3. 상수값의 의미:

UIUserNotificationTypeNone : Allow Notifications on/off

UIUserNotificationTypeBadge : Badge App Icon on/off

UIUserNotificationTypeSound : Sounds on/off

@ How to open application system notification setting view

- (void)launchSystemApplicationNotificationSettingView {

    if (&UIApplicationOpenSettingsURLString)

    { //only for ios8

        NSURL *appSettings = [NSURL URLWithString:UIApplicationOpenSettingsURLString];

        [[UIApplication sharedApplication] openURL:appSettings];
    }

}

objc_setAssociatedObject , objc_getAssociatedObject

#import <objc/runtime.h>

예제1)

// set

    {

        objc_setAssociatedObject(self, @"ShouldDismissModalViewLater", modalViewController, OBJC_ASSOCIATION_ASSIGN);

    }

    

    // get and using

    {

        UIViewController *modalVC = objc_getAssociatedObject(self, @"ShouldDismissModalViewLater");

        [modalVC dismissViewControllerAnimated:YES completion:nil];

    }

예제2)

// set

    {

        NSArray *gotArray;

        objc_setAssociatedObject(self, @"MyGotArray", gotArray, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

    }

    

    // get and using

    {

        NSArray *array = objc_getAssociatedObject(self, @"MyGotArray");

        [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

            

        }];

    }

예제3)

Easier syntax

Alternatively you could use @selector(nameOfGetter) instead of creating a static pointer. Why? See http://stackoverflow.com/a/16020927/202451. Example:

- (NSArray *)laserUnicorns {
    return objc_getAssociatedObject(self, @selector(laserUnicorns));
}

- (void)setLaserUnicorns:(NSArray *)unicorns {
    objc_setAssociatedObject(self, @selector(laserUnicorns), unicorns, OBJC_ASSOCIATION_RETAIN_NONATOMIC); 
}




async download images

NSURLSession를 이용한 방법)

xxx.h

NSURLSession *mealNewsUrlSession;

xxx.m

// initialization

mealNewsUrlSession = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

// use

NSURL *imageURL = [NSURL URLWithString:imagePath];

            NSURLRequest *request = [NSURLRequest requestWithURL:imageURL];

            NSURLSessionDataTask *task = [mealNewsUrlSession dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

                if (error)

                {

                    NSLog(@"ERROR: %@", error);

                }

                else

                {

                    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;

                    

                    if (httpResponse.statusCode == 200)

                    {

                        UIImage *image = [UIImage imageWithData:data];

                        [mealNewsImageCache setObject:image forKey:imagePath];

                        

                        dispatch_async(dispatch_get_main_queue(), ^{

                            [cell.mealPhoto setImage:image];

                            [cell setNeedsLayout];

                            //[cell.activityIndicator stopAnimating];

                        });

                    }

                    else

                    {

                        NSLog(@"Couldn't load image at URL: %@", imageURL);

                        NSLog(@"HTTP %ld", (long)httpResponse.statusCode);

                    }

                }

            }];

            [task resume];

dispatch를 이용한 방법)

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);

        dispatch_async(queue, ^(void) {

            

            NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:profilePath]];

            UIImage* image = [[UIImage alloc] initWithData:imageData];

            if (image) {

                [mealNewsImageCache setObject:image forKey:profilePath];

                

                dispatch_async(dispatch_get_main_queue(), ^{

                    [self.profilePhoto setImage:image forState:UIControlStateNormal];

                });

            }

        });

3. 한번에 모두 다운로드 한후에 이용하는 방법)

xxx.h

NSOperationQueue *_asyncQueue;

xxx.m

// initialization

{

_asyncQueue = [[NSOperationQueue alloc] init];

or

_asyncQueue = [NSOperationQueue mainQueue]

or

_asyncQueue = [NSOperationQueue currentQueue]

}

{

// use

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        NSURLRequest *request = [NSURLRequest requestWithURL:url];

        [NSURLConnection sendAsynchronousRequest:request queue:_asyncQueue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

            

            UIImage *image = [[UIImage alloc] initWithData:data];

            [Utility saveImageToFS:UIImageJPEGRepresentation(image, 1.0) withUrl:request.URL];

            

            dispatch_async(dispatch_get_main_queue(), ^{

                //update cell

            });

        }];

    }); //dispatch_async

}

+ (void) saveImageToFS:(NSData *)data withUrl:(NSURL *)url {

    NSString *dir = [[url absoluteString] stringByDeletingLastPathComponent];

    NSString *filename = [url.absoluteString lastPathComponent];

    

    //

    NSString *path = [NSString stringWithFormat:@"%@/%@",[Utility getMangaRootPath],dir];

    if(![[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil])

        NSLog(@"fail to create directory ");

    

    

    NSString *fullpath = [path stringByAppendingFormat:@"/%@",filename];

    if(![data writeToFile:fullpath atomically:YES])

        NSLog(@"fail to write file");

}

+ (NSString *)getMangaRootPath {

    NSString *path = [NSString stringWithFormat:@"%@/%@",

                      [self getCachesPath],

                      kMangaEditionDirectory];

    // create directory

    [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];

    return path;

}

+ (NSString*)getCachesPath {

    NSString *documentPath = nil;

    

    NSSearchPathDirectory directory;

    directory = NSCachesDirectory;

    

    NSArray* directories = NSSearchPathForDirectoriesInDomains(directory, NSUserDomainMask, YES);

if(directories != nil && [directories count] > 0)

        documentPath = [directories objectAtIndex:0];

    return documentPath;

}