chuanyituoku的专栏

Item 44: Use Dispatch Groups to Take Advantage of Platform Scaling Dispatch groups are a GCD feature that allows you to easily group tasks. You can then wait on that set of tasks to finish or be no

@implementation MyCustomClass - (NSOperation*)taskWithData:(id)data { NSInvocationOperation* theOp = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(myTaskMethod:) object:data]