make didUpdateValueForCharacteristic asynchronous

Question

目前我正在开发一个通过BLE（ios）上传文件的项目

目前我有一个循环来发送文件中的所有数据，一旦文件中的指针到达结束，我就关闭循环。

因此，在固件方面，我写入的特性将从0更新为100，作为固件接收到的字节数的进度指示。

我的didUpdateValueForCharacteristic仅在我的循环结束后被调用，因为我相信它们是同步的并且都在主线程上工作。

我试图使我的循环异步，所以我仍然可以在发送时听取方法didUpdateValueForCharacteristic

dispatch_async(_sendFileQueue, ^{
    while (_isFileSending) {
    // File is still sending
    // Upload file from offset
    [self uploadFile:_offset];
 }
});

所以我尝试了这个，但我仍然在循环结束时获得更新，但我不知道是不是因为我在iOS端没有得到响应的连接间隔。我知道固件是在发送文件时更新UUID。

uploadFile的来源

- (void)uploadFile:(int)from {
    // Look at file from index from
    [_filePath seekToFileOffset:from];
    NSData *soundData = [_filePath readDataOfLength:_packetSize];
    // data it should be greater than 0 bytes
    if (soundData.length > 0) {
    [self connectToPeripherals:soundData];
       // Find new pointer
       _offset += _packetSize;
    } 
}


- (void)connectToPeripherals:(NSData *)data {
    // Using NSNumber since I want to check if I get a nil returned
    NSNumber *writeWithResponse = nil;

    CBPeripheral *firstPeripheral = self.peripherals[0];
    CBCharacteristic *firstCharacteristics = self.characteristics[0];

    // Check if properties have a response, if so write with response
    if((self.characteristicManager.properties & CBCharacteristicPropertyWrite)
   == CBCharacteristicPropertyWrite) {
        DLog(@"Write with response");
        writeWithResponse = [NSNumber numberWithBool:YES];
    } else if ((self.characteristicManager.properties &
            CBCharacteristicPropertyWriteWithoutResponse) ==
           CBCharacteristicPropertyWriteWithoutResponse) {
        DLog(@"Write without response");
        writeWithResponse = [NSNumber numberWithBool:NO];
    }
    // There is no write property
    if (!writeWithResponse) {
        DLog(@"ERROR! Could not write to characteristics");
        return;
    }
    // Write to the first peripheral
    [firstPeripheral writeValue:data forCharacteristic:firstCharacteristics
                       type:[writeWithResponse boolValue] ?
    CBCharacteristicWriteWithResponse :    CBCharacteristicWriteWithResponse];
}

tl; dr 在所有内容中调用didUpdateValueForCharacteristic