NSOperation Global Background Queue

gistfile1.m

//NSOperationQueue+GlobalBackgroundQueue.h

@interface NSOperationQueue (GlobalBackgroundQueue)

+ (instancetype)backgroundQueue;

@end


//NSOperationQueue+GlobalBackgroundQueue.m

static NSOperationQueue *backgroundQueue;

@implementation NSOperationQueue (GlobalBackgroundQueue)

+ (instancetype)backgroundQueue {
    static dispatch_once_t dispatchToken;
    dispatch_once(&dispatchToken, ^{
        backgroundQueue = [self new];
    });
    return backgroundQueue;
}

@end


//Use in other code

[[NSOperationQueue backgroundQueue] addOperationWithBlock:^{
    //This runs in the background
}];