[iOS] NSOperationQueue をシングルトンで扱う方法

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NSOperationQueue をシングルトンで扱うために下記のように NSOperationQueue+SharedQueue.h と NSOperationQueue+SharedQueue.m を追加します。

//  NSOperationQueue+SharedQueue.h
 
#import <Foundation/Foundation.h>
 
@interface NSOperationQueue (SharedQueue)
 
+ (NSOperationQueue *) sharedOperationQueue;
- (void)performSelectorOnBackgroundQueue:(SEL)aSelector withObject:(id)anObject;
 
@end
 
#define SHARED_OPERATION_QUEUE [NSOperationQueue sharedOperationQueue]
//  NSOperationQueue+SharedQueue.m
 
#import "NSOperationQueue+SharedQueue.h"
 
@implementation NSOperationQueue (SharedQueue)
 
+ (NSOperationQueue *) sharedOperationQueue {
 
    static dispatch_once_t pred;
    static NSOperationQueue* sharedQueue;
 
    dispatch_once(&pred, ^{
        sharedQueue = [[NSOperationQueue alloc] init];
    });
 
    return sharedQueue;
}
 
- (void) performSelectorOnBackgroundQueue:(SEL)aSelector withObject:(id)anObject {
 
    NSOperation* operation = [[NSInvocationOperation alloc]
                              initWithTarget:self
                              selector:aSelector
                              object:anObject];
    [[NSOperationQueue sharedOperationQueue] addOperation:operation];
    [operation release];
}
 
@end

[参考]

iphone – Sharing NSOperationQueue across View Controllers? – Stack Overflow

Tutorial: Asynchronous HTTP Client Using NSOperationQueue | iPhone Programming Tutorials

objective c – Global NSOperationQueue – Stack Overflow

Cocoa Tutorial: NSOperation and NSOperationQueue | Cocoa Is My GirlfriendCocoa Is My Girlfriend

Library/NSOperationQueue+SharedQueue.h at master · docchang/Library · GitHub

Library/NSOperationQueue+SharedQueue.m at master · docchang/Library · GitHub

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