[英]BLE(BlueTooth Enable device) ios
如果特性中有多个属性,如何读写值?
例如,LED颜色为RGB:
特征: LED颜色UUID:7A5A0011-D04B-48EB-B3FA-32EB4F0FFAC4 LED颜色和强度(RGB格式)。 名称绿色名称蓝色格式无符号的8位整数访问读取,写入值0-255格式无符号的8位整数访问读取,写入值0-255名称红色格式无符号的8位整数访问读取,写入值0-255
那么如何读取/写入RGB值呢? 使用下面的代码,我只有一个值
if ([service.UUID isEqual:[CBUUID UUIDWithString:LED_Service_UUID]]){
for (CBCharacteristic *aChar in service.characteristics) {
/********* Characteristic: LED Link***************/
NSLog(@"%@",aChar.UUID);
if ([aChar.UUID isEqual:[CBUUID UUIDWithString: LED_CHAR_COLOR_UUID]]) {
[peripheral readValueForCharacteristic:aChar];
NSLog(@"%@%@%@",aChar.value,aChar.value,aChar.value);
}
if ([aChar.UUID isEqual:[CBUUID UUIDWithString: LED_CHAR_COLOR_UUID]])
{
_colorCharacteristic = aChar; //It's a property, save it
[peripheral readValueForCharacteristic:aChar];
}
这应该触发委托方法: peripheral:didUpdateValueForCharacteristic:error:
。
在里面:
if ([characteristic UUID] isEqual:[CBUUID UUIDWithString: LED_CHAR_COLOR_UUID]])
{
NSData *valueData = [characteristic value];
}
对于每种成分(红色,绿色,蓝色,强度):
int aComponent;
NSData *aComponentData = [valueData subdataWithRange:NSMakeRange(0, 2)]; //Range to be defined for each components
[aComponentData getBytes:&aComponent length:sizeof(aComponent)];
NSLog(@"aComponent: %d", aComponent);
然后,您可以使用colorWithRed:green:blue:alpha:
从每个组件创建一个UIColor
。
要编写,您必须再次拥有一个看起来尊重所使用格式的NSData
。
uint8_t colorValues [] = {redValue, greenValue, blueValue, intensityValue};
NSData *data = [NSData dataWithBytes:colorValues length:sizeof(colorValues)];
[_peripheral writeValue:yourValueData forCharacteristic:_colorCharacteristic type: CBCharacteristicWriteWithResponse];` //(or `CBCharacteristicWriteWithoutResponse` depending on the doc of your device).
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.