iOS蓝牙开发 - BLE(蓝牙4.0) - 好文

设备:

* 中心设备(CBCentralManager):iOS系统的手机等设备
* 外围设备(CBPeripheral):手环等第三方设备
外围设备:

* 服务: 外围设备下的子信息, 每个服务有一个UUID标示.
* 特征:服务下的子信息, 每个特征也有一个UUID标示.特征是外围设备的最小单位,每一个特征信息代表设备的一个信息或者数据, 以手环为例,
每一个特征可能代表手环记录的步数或者电量等信息.
实现步骤:

* 创建中心设备(CBCentralManager)
* 中心设备开始扫描(scanForPeripherals)
* 扫描到外围设备之后, 自动调用中心设备的代理方法(didDiscoverPeripheral)
* 如果设备过多, 可以将扫描到的外围设备添加到数组
* 开始连接, 从数组中过滤出自己想要的设备, 进行连接(connectPeripheral)
* 连接上之后, 自动调用中心设备的代理方法(didConnectPeripheral), 在代理中,
进行查找外围设备的服务(peripheral.discoverServices)
* 查找到服务之后, 自动调用外围设备的代理(didDiscoverServices),
可通过UUID,查找具体的服务,查找服务(discoverCharacteristics)
* 查找到特征之后, 自动调用外围设备的代理(didDiscoverCharacteristics), 通过UUID找到自己想要的特征,
读取特征(readValueForCharacteristic)
* 读取到特征之后, 自动调用外设的代理方法(didUpdateValueForCharacteristic),在这里打印或者解析自己想要的特征值.
代码:
#import "ViewController.h" #import <CoreBluetooth/CoreBluetooth.h> //4个字节Bytes
转 int unsigned int TCcbytesValueToInt(Byte *bytesValue) { unsigned int intV;
intV = (unsigned int ) ( ((bytesValue[3] & 0xff)<<24) |((bytesValue[2] & 0xff)<<
16) |((bytesValue[1] & 0xff)<<8) |(bytesValue[0] & 0xff)); return intV; }
@interface ViewController () <CBCentralManagerDelegate, CBPeripheralDelegate>
// 扫描设备 - (IBAction)scanPeripheral:(id)sender; // 连接蓝牙 - (IBAction
)startConnect:(id)sender; // 断开蓝牙 - (IBAction)disConnect:(id)sender; // 开始震动 - (
IBAction)startShake:(id)sender; // 停止震动 - (IBAction)stopShake:(id)sender;
@property (weak, nonatomic) IBOutlet UILabel *label; // 中心设备 @property (
nonatomic, strong) CBCentralManager *manager; // 外围设备集合 @property (nonatomic,
strong) NSMutableArray *peripherals; @end @implementation ViewController - (
NSMutableArray *)peripherals{ if (!_peripherals) { self.peripherals = [
NSMutableArray array]; } return _peripherals; } - (void)viewDidLoad { [super
viewDidLoad];self.manager = [[CBCentralManager alloc] initWithDelegate:self
queue:nil]; } // 扫描设备 - (IBAction)scanPeripheral:(id)sender { NSLog(@"扫描设备...");
// 扫描设备 [self.manager scanForPeripheralsWithServices:nil options:nil]; } // 开始连接
- (IBAction)startConnect:(id)sender { for (CBPeripheral *peripheral in self
.peripherals) { NSLog(@"----->>>>>> peripheral == %@", peripheral); if
([peripheral.name isEqualToString:@"MI"]) { NSLog(@"这是公司的小米手环设备!"); // 中心设备连接
外围设备 [self.manager connectPeripheral:peripheral options:nil]; } } } // 断开连接 - (
IBAction)disConnect:(id)sender { } // 开始震动 - (IBAction)startShake:(id)sender { }
// 停止震动 - (IBAction)stopShake:(id)sender { } #pragma mark -当前蓝牙主设备状态 - (void
)centralManagerDidUpdateState:(CBCentralManager *)central{switch (central.state
) {case CBCentralManagerStateUnknown: NSLog(@">>>CBCentralManagerStateUnknown");
break; case CBCentralManagerStateResetting: NSLog(@
">>>CBCentralManagerStateResetting"); break; case
CBCentralManagerStateUnsupported:NSLog(@">>>CBCentralManagerStateUnsupported");
break; case CBCentralManagerStateUnauthorized: NSLog(@
">>>CBCentralManagerStateUnauthorized"); break; case
CBCentralManagerStatePoweredOff:NSLog(@">>>CBCentralManagerStatePoweredOff");
break; default: break; } } // 发现设备会进入方法 - (void
)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral
*)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber
*)RSSI{// 添加外围设备 if (![self.peripherals containsObject:peripheral]) { // 设置外设的代理
peripheral.delegate = self; [self.peripherals addObject:peripheral]; NSLog(@
"扫描连接外设：%@ ",peripheral); self.label.text = [NSString stringWithFormat:@"%@",
peripheral]; } }/** * 连接到某个外设的时候调用 */ - (void)centralManager:(CBCentralManager
*)central didConnectPeripheral:(CBPeripheral *)peripheral{ [central stopScan];
NSLog(@"连接上了"); // 查找外设中的所有服务 [peripheral discoverServices:nil]; } #pragma mark
- CBPeripheralDelegate /** * 外设已经查找到服务 */ - (void)peripheral:(CBPeripheral
*)peripheral didDiscoverServices:(NSError *)error{ // 遍历所有的服务 for (CBService
*service in peripheral.services) { NSLog(@"服务 = %@", service); // 过滤掉不想要的服务 if
([service.UUID.UUIDString isEqual:@"FEE0"]) { // 找到想要的服务 // 扫描服务下面的特征
[peripheral discoverCharacteristics:nil forService:service]; } } } - (void
)peripheral:(CBPeripheral *)peripheral
didDiscoverCharacteristicsForService:(CBService *)service error:(NSError
*)error {// 遍历所有的特征 for (CBCharacteristic *characteristic in service
.characteristics) { NSLog(@"特征 = %@", characteristic); // 过滤掉不想要的特征 if
([characteristic.UUID.UUIDString isEqual:@"FF0C"]) { // 找到想要的特征 NSLog(@"电量: %@"
, characteristic); [peripheral readValueForCharacteristic:characteristic]; } } }
#pragma mark 设备信息处理 //扫描到具体的值 - (void)peripheral:(CBPeripheral *)peripheral
didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic
error:(nullableNSError *)error { if (error) { NSLog(@"扫描外设的特征失败！%@-> %@"
,peripheral.name, [error localizedDescription]); self.title = @"find value
error."; return; } NSLog(@"%@ %@",characteristic.UUID.UUIDString,characteristic
.value); Byte *bufferBytes = (Byte *)characteristic.value.bytes; int buterys =
TCcbytesValueToInt(bufferBytes)&0xff; NSLog(@"电池：%d%%",buterys); } @end

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