本文介绍了一个使用GCD（Grand Central Dispatch）实现的Objective-C类GCDManager，该类提供了addDispatch_group_async和addDispatch_group_notify两个方法，用于管理异步多线程并发任务。addDispatch_group_async方法用于添加一个将在全局高优先级队列中执行的异步任务，任务完成后将减少gcdGroup的计数；addDispatch_group_notify方法则在所有通过addDispatch_group_async添加的任务都完成时，在主线程中执行回调。
@interface GCDManager : NSObject
-(void)addDispatch_group_async:(void(^)(void))block;
-(void)addDispatch_group_notify:(void(^)(void))block;
@end
#import "GCDManager.h"
@interface GCDManager()
@property (nonatomic, strong) dispatch_group_t gcdGroup;
@property (nonatomic, strong) dispatch_queue_t gcdQueue;
@end
@implementation GCDManager
#pragma mark - 异步多线程并发 * * * * * * * * * * * * * * * * * * * * ** * *
/** 添加一个线程执行结束后会回到addDispatch_group_notify*/
-(void)addDispatch_group_async:(void(^)(void))block{
dispatch_group_enter([self gcdGroup]);
dispatch_group_async([self gcdGroup], [self gcdQueue], ^{
block();
dispatch_group_leave([self gcdGroup]);
});
}
/** 当多个addDispatch_group_async全部执行结束后才执行*/
-(void)addDispatch_group_notify:(void(^)(void))block{
dispatch_group_notify([self gcdGroup], dispatch_get_main_queue(), ^{
block();
});
}
-(dispatch_group_t)gcdGroup{
if(_gcdGroup==nil){
_gcdGroup = dispatch_group_create();
}
return _gcdGroup;
}
- (dispatch_queue_t)gcdQueue{
if(_gcdQueue == nil){
_gcdQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
}
return _gcdQueue;
}
@end
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