ios – NSOperation阻止UI绘画？

在主线程上没有执行响应于您的通知执行的观察器中的方法.

因此,在该方法中,您可以使用PerformSELEctorOnMainThread：withObject：waitUntilDone：强制另一个方法在主线程上运行.

例如：

@H_890_2@myOperation.m

- (void)main {
    for (int i = 1; i <= 5; i++) {
        sleep(1);
        [[NsnotificationCenter defaultCenter] postNotificationName:@"GTCNotification" object:[NSnumber numberWithInteger:i]];
    }
}

@H_890_2@myViewController.m

- (void)setupOperation {
    [[NsnotificationCenter defaultCenter] addObserver:self SELEctor:@SELEctor(myNotificationResponse:) name:@"GTCNotification" object:nil];

    NSOperationQueue *opQueue = [[NSOperationQueue alloc] init];
    MyOperation *myOp = [[MyOperation alloc] init];

    [opQueue addoperation:myOp];

    [myOp release];
    [opQueue release];
}

- (void)myNotificationResponse:(Nsnotification*)note {
    NSnumber *count = [note object];
    [self performSELEctorOnMainThread:@SELEctor(updateView:) withObject:count waitUntilDone:YES];
}

- (void)updateView:(NSnumber*)count {
    countLabel.text = count.stringvalue;
}