動態下載.pod檔

In cocos3D you can create a node from a pod file by simply executing:

[CC3PODResourceNode nodeFromResourceFile:podFileName];

Here you can find a full working sample.
If your pod file is available online, you could first download it locally:

NSURL *url = [NSURL URLWithString:YOUR_URL_HERE];
NSData *urlData = [NSData dataWithContentsOfURL:url];
[urlData writeToFile:filePath atomically:YES];

then pass filePath to nodeFromResourceFile.
filePath identifies a file residing in the user documents directory (one of the few places where you can write files to, under iOS):

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"PODFILE.pod"];

If you want to save to a temporary directory, use:

NSTemporaryDirectory()

instead of documentsDirectory.