ios - 如何在IOS 7中将警报级别写入警报级别的特征？

我是 iOS 开发新手，正在研究适用于 IOS 的低功耗蓝牙(BLE，蓝牙 4.0)。

我想知道如何在 IOS 7 上使用 Immediate Alert Service。

我可以从 BLE 设备 扫描、连接和发现服务。 接下来是连接到Immediate alert Service并将警报级别的特征写入BLE设备.

我已经定义了 Immediate alert Service 和 Alert level 的 UUID，如下代码所示。

#define IMMEDIATE_ALERT_UUID           @"00001802-0000-1000-8000-00805f9b34fb"
#define ALERT_LEVEL_UUID    @"00002a06-0000-1000-8000-00805f9b34fb"

以下代码是关于连接到即时警报服务。

[peripheral discoverServices[[CBUUID UUIDWithString:IMMEDIATE_ALERT_UUID]]];

连接IMMEDIATE_ALERT_UUID后的警报级别特征的代码如下关注。

- (void)peripheralCBPeripheral *)peripheral didDiscoverServicesNSError *)error
{
    for (CBService *service in peripheral.services) {
        [peripheral discoverCharacteristics[[CBUUID UUIDWithString:ALERT_LEVEL_UUID]] forService:service];
    }
}

订阅警报级别特征。

- (void)peripheralCBPeripheral *)peripheral didDiscoverCharacteristicsForServiceCBService *)service errorNSError *)error
{
      if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:ALERT_LEVEL_UUID]]) {

            // If it is, subscribe to it
            [peripheral setNotifyValue:YES forCharacteristic:characteristic];
        }
}

但是如何将警报级别写入警报级别的特征？？

提前致谢。

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Best Answer-推荐答案

-(void)peripheralCBPeripheral *)peripheral didDiscoverCharacteristicsForServiceCBService *)service errorNSError *)error{
    if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:ALERT_LEVEL_UUID]]){

    uint8_t val = 0 //enter the value which you want to write.
    NSData* valData = [NSData dataWithBytesvoid*)&val length:sizeof(val)];

    [peripheral writeValue:valData forCharacteristic:characteristictype:CBCharacteristicWriteWithResponse];
}

放参数CBCharacteristicWriteWithResponse会调用CBPeripheralDelegate方法 - (void)peripheralCBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{ }

关于ios - 如何在IOS 7中将警报级别写入警报级别的特征？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23148548/