objective-c - 为什么 nsoperation 连续工作？

Question

我正在使用以下代码进行 nsoperation。问题是所有三个任务都是串行运行的。我该怎么做才能使任务并行运行。我尝试实现 start 和 isconcurrent 方法，但它不起作用。请帮助.. .给出的是我的 uaview Controller 类

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    Store *S=[ [Store alloc] init];
    S.a=25;

    NSOperationQueue *someQueue = [NSOperationQueue currentQueue];

    someQueue.MaxConcurrentOperationCount = 3;

    NSInvocationOperation *invocationOp2 = [[NSInvocationOperation alloc]  initWithTarget:self
                                                                                 selector:@selector(ymain)
                                                                                   object:nil];

    NSInvocationOperation *invocationOp3 = [[NSInvocationOperation alloc]  initWithTarget:self
                                                                                 selector:@selector(ymain2)
                                                                                   object:nil];
    NSInvocationOperation *invocationOp4 = [[NSInvocationOperation alloc]  initWithTarget:self
                                                                                 selector:@selector(ymain3)
                                                                                   object:nil];


    [someQueue addOperation:invocationOp2];
    [someQueue addOperation:invocationOp3];
    [someQueue addOperation:invocationOp4];




}
-(void)ymain
{





    for (int i = 0 ; i < 10000 ; i++) {
        NSLog(@"in the A main");    }
}

这是被子类化的另一个类

@interface A : NSOperation

@end

@implementation A

bool executing;
bool finished;
-(void)main
{

}
- (BOOL)isConcurrent
{
    return YES;
}

- (BOOL)isReady
{
    return YES;
}

Answer 1

currentQueue 正在返回主队列，这是一个在主运行循环上执行的串行队列。您应该创建自己的 NSOperationQueue 来同时运行这些操作。