fast Downloading Images From server and save to document directory

Add New Class of type NSobject :-
.H file :-

#import <Foundation/Foundation.h>

@interface downloadImageClass : NSObject{

}

+ (void)processImageDataWithURLString:(NSString *)urlString andBlock:(void (^)(NSData *imageData))processImage;

@end

.M file :-

#import "downloadImageClass.h"

#import <QuartzCore/QuartzCore.h>

@implementation downloadImageClass

+ (void)processImageDataWithURLString:(NSString *)urlString andBlock:(void (^)(NSData *imageData))processImage

{

    NSURL *url = [NSURL URLWithString:urlString];

    

    dispatch_queue_t callerQueue = dispatch_get_current_queue();

    dispatch_queue_t downloadQueue = dispatch_queue_create("com.myapp.processsmagequeue", NULL);

    dispatch_async(downloadQueue, ^{

        NSData * imageData = [NSData dataWithContentsOfURL:url];

        

        dispatch_async(callerQueue, ^{

            processImage(imageData);

        });

    });

    dispatch_release(downloadQueue);

}

@end

Save Images to document Directory  :-

- (void)save_to_document_directory{

    NSArray *pathArr = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *path = [pathArr objectAtIndex:0];

NSFileManager *fileManager = [NSFileManager defaultManager];

NSString *dirPath1 = [path stringByAppendingPathComponent:@"FolderNserverame"];

    self.dirPath = dirPath1;

if (![fileManager fileExistsAtPath:dirPath1]) {

[fileManager createDirectoryAtPath:dirPath1 withIntermediateDirectories:NO attributes:nil error:nil];

}

NSError *error;

for (NSString *file in [fileManager contentsOfDirectoryAtPath:dirPath1 error:&error]) {

BOOL success = [fileManager removeItemAtPath:[NSString stringWithFormat:@"%@/%@", dirPath1, file] error:&error];

if (!success || error) {

// it failed.

}

}

    

    for (int i = 0 ; i < [myimagesArray count]; i++) {

        [WebImageOperations processImageDataWithURLString:[myimagesArray objectAtIndex:i] andBlock:^(NSData *imageData) {

          

            

                NSString *imageName = [[[self.responseDataDic objectAtIndex:i]objectForKey:@"Name"]stringByAppendingString:@".png"];

                NSLog(@"imageName....%@",imageName);

                if (![fileManager fileExistsAtPath:[dirPath1 stringByAppendingPathComponent:imageName]]) {

                    [fileManager createFileAtPath:[dirPath1 stringByAppendingPathComponent:imageName] contents:imageData attributes:nil];

                }

           

            

        }];

    }

    

}