iPhone/iOS How to load a lot of image in many folder and show in a table view?

问题

I got annoying question...

What if I have many image , and I want load it in to a table view

And show the file name as cell's text , and the preview image is also show in the cell.

When I select the cell , it will push to next view , show the big size image.

That's it .

I don't know how to load many folder to an array?

/*********** EDIT ***********/ This is the folder I set many images inside

You can see that's only one root folder ...

And this is my code to load the image inside

NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Image"ofType:@""];
NSDirectoryEnumerator *direnum;
direnum = [fileManager enumeratorAtPath: filePath];
imageFolder = [NSMutableArray new];
for(NSString *filename in direnum){
    if([[filename pathExtension] isEqualToString:@"png"]){
        [imageFolder addObject:filename];
    }
}
NSLog(@"Files in the folder %@",imageFolder);

I got result like this :

 Files in the folder (
"macro1.png",
"macro10.png",
"macro11.png",
"macro12.png",
"macro13.png",
"macro14.png",
"macro15.png",
"macro16.png",
"macro17.png",
"macro18.png",
"macro19.png",
"macro2.png",
"macro20.png",
"macro21.png",
"macro22.png",
"macro23.png",
"macro24.png",
"macro25.png",
"macro26.png",
"macro27.png",
"macro4.png",
"macro5.png",
"macro6.png",
"macro7.png",
"macro8.png",
"macro9.png"

)

But what if I change the root folder like this

How to read the image files in the subfolders?

回答1:

The App won't have issues finding files inside the bundle. The structure of your app development folders is irrelevant to the end product, for the most part. If you are storing the images in the apps bundle, the system can find it.

UIImage *image = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"imageName" ofType:@"png"]];

When I've had to do this as a quicky solution, I created an NSDictionary entry for each photo and stored that inside of an array in userPrefs. I programmatically created thumbnails for each image to utilize in the cell.imageView.image property, and then used an NSDictionary with @"description", @"imageName", and @"imageNameThumbnail" as the keys. You could do the same thing with an NSArray and just call the objectAtIndex, but I prefer the plain text friendliness of dictionaries.

You can try testing the path information that is being returned. Here are a couple of lines to try:

NSString *path1 = [[NSBundle mainBundle] pathForResource:@"imageName" ofType:@"png"];
NSString *path2 = [[NSBundle mainBundle] pathForResource:@"imageName" ofType:@"png" inDirectory:@"folderName"];
NSLog(@"Path 1: %@",path1);
NSLog(@"Path 2: %@",path2);

See what the output for these lines is, or if they return nothing.

Documents Directory as filePath

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectoryPath = [paths objectAtIndex:0];

Then, enumerate the documentsDirectoryPath, and it should read subfolders recursively.

回答2:

If it is local data you are using, you probably want to put the data in a .plist file. You would just be putting the names of the files in there, and then load the plist into an NSDictionary which you will only have one key for called "images" or something like that. You can then load all the objects under the "images" key into an array and use that array to populate your table.

Hope this makes sense.

来源：https://stackoverflow.com/questions/6566827/iphone-ios-how-to-load-a-lot-of-image-in-many-folder-and-show-in-a-table-view

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