在iOS中查看来自Web文件夹的图像数组

Question

I want to be able to view images from a web folder inside my iPhone app. I know how to view the images with a specific url (ie www.mywebsite.com/image.jpg). That's easy. I just don't know how to asynchronously load an array. Basically I need to view images with a specific sequence (ie mywebsite.com/image_001.jpg, image_002.jpg, image_003.jpg, etc). There may be 10 or 100 images in a folder with that sequence. How do I let my app load images with a sequence?

Answer 1

Following code will sort images of this file format "imageName_number.jpg"

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *webDir=[documentsDirectory stringByAppendingPathComponent:@"WebFolder"];
    NSFileManager *filemgr;


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


    filemgr = [NSFileManager defaultManager];

    //This will give all files of your web directory you can uncomment to get dynamically
    //NSArray *filelist = [filemgr contentsOfDirectoryAtPath: webDir error: nil];
    // this is just example shows how unsorted will be used to sort image no you can comment this line
    NSArray *filelist=[[NSArray alloc]initWithObjects:@"abc_001.jpg",@"def_005.jpg",@"abc_002.jpg",@"abc_0103.jpg",@"abc_0010.jpg",@"abc_008.jpg", nil];
   int count = (int)[filelist count];

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

   NSString *imageSeprator=@"_";

    for (int i = 0; i < count; i++){
        NSString *imageName=[filelist objectAtIndex: i];
        if (!([imageName rangeOfString:imageSeprator].location == NSNotFound)) {

            NSRange startRange = [imageName rangeOfString:imageSeprator];
            NSRange endRange = [imageName rangeOfString:@".jpg"];

            NSRange searchRange = NSMakeRange( startRange.location+1, endRange.location-endRange.length);
            NSString *strNum= [imageName substringWithRange:searchRange];

            NSString *webPath=[webDir stringByAppendingPathComponent:imageName];
            [dictFileNumWithPath setObject:[NSNumber numberWithInt:[strNum intValue]] forKey:webPath];

        }
    }

    NSArray *sortedKeysFilePathArray =
    [dictFileNumWithPath keysSortedByValueUsingSelector:@selector(compare:)];

    NSLog(@"%@", sortedKeysFilePathArray);