Core Bluetooth

#import "ViewController.h"
#import 
@interface ViewController () 
@property (nonatomic, strong) CBCentralManager *manager;
@property (nonatomic, strong) NSMutableArray *peripherals;
@end

@implementation ViewController

#pragma mark - 懒加载
- (CBCentralManager *)manager
{
    if (_manager == nil) {
        _manager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
    }
    return _manager;
}

- (NSMutableArray *)peripherals
{
    if (_peripherals == nil) {
        _peripherals = [NSMutableArray array];
    }
    return _peripherals;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 1.扫描所有的外围设备
    // serviceUUIDs:可以将你想要扫描的服务的外围设备传入(传nil,扫描所有的外围设备)
    [self.manager scanForPeripheralsWithServices:nil options:nil];
}

#pragma mark - CBCentralManagerDelegate
/**
 *  状态发生改变的时候会执行该方法(蓝牙4.0没有打开变成打开状态就会调用该方法)
 */
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
    
}

/**
 *  当发现外围设备的时候会调用该方法
 *
 *  @param peripheral        发现的外围设备
 *  @param advertisementData 外围设备发出信号
 *  @param RSSI              信号强度
 */
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
    if (![self.peripherals containsObject:peripheral]) {
        [self.peripherals addObject:peripheral];
    }
    NSLog(@"%@,%@,%@", peripheral, advertisementData, RSSI);
}

/**
 *  连接上外围设备的时候会调用该方法
 *  @param peripheral 连接上的外围设备
 */
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    // 1.扫描所有的服务
    // serviceUUIDs:指定要扫描该外围设备的哪些服务(传nil,扫描所有的服务)
    [peripheral discoverServices:nil];
    
    //2.设置代理
    peripheral.delegate = self;
}

#pragma mark - CBPeripheralDelegate
/**
 *  发现外围设备的服务会来到该方法(扫描到服务之后直接添加peripheral的services)
 */
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
    for (CBService *service in peripheral.services) {
        if ([service.UUID.UUIDString isEqualToString:@"123"]) {
            // characteristicUUIDs : 可以指定想要扫描的特征(传nil,扫描所有的特征)
            [peripheral discoverCharacteristics:nil forService:service];
        }
    }
}

/**
 *  当扫描到某一个服务的特征的时候会调用该方法
 *  @param service    在哪一个服务里面的特征
 */

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
    for (CBCharacteristic *characteristic in service.characteristics) {
        if ([characteristic.UUID.UUIDString isEqualToString:@"456"]) {
            // 拿到特征,和外围设备进行交互
        }
    }
}

#pragma mark - 链接设备
- (void)connect:(CBPeripheral *)peripheral
{
    [self.manager connectPeripheral:peripheral options:nil];
}
@end