/* 建立中心设备 扫描外设（Discover Peripheral） 连接外设（Connect Peripheral） 扫描外设中的服务和特征（Discover Services And Charateristics） 利用特征与外设做数据交互（Explore And Interact） 断开连接（Disconnect） */#import "ViewController.h"#import 
     
      @interface ViewController ()
      
       @property (nonatomic, strong) CBCentralManager *mgr;/** 发现的外设数组*/@property (nonatomic, strong) NSMutableArray *peripheralArray;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];        // 1.建立中心设备    // queque:如果说你传空，在主队列    self.mgr = [[CBCentralManager alloc] initWithDelegate:self queue:nil];        // 2.扫描外设    }- (void)viewWillDisappear:(BOOL)animated {    [super viewWillDisappear:animated];        // 最后一步，断开连接    [self.mgr stopScan];}#pragma CBCentralManagerDelegate/*state:CBManagerStateUnknown = 0, 未知CBManagerStateResetting, 重置CBManagerStateUnsupported, 不支持CBManagerStateUnauthorized, 未经授权CBManagerStatePoweredOff, 没有启动CBManagerStatePoweredOn, 开启 */- (void)centralManagerDidUpdateState:(CBCentralManager *)central {        NSLog(@"state = %zd", central.state);    // 蓝牙开启    if (central.state == CBManagerStateUnknown) {                NSLog(@"未知的蓝牙");    }    if (central.state == CBManagerStatePoweredOn) {                // 2.扫描外设        [self.mgr scanForPeripheralsWithServices:nil options:nil];    }}/** 3.连接外设（Connect Peripheral） @param peripheral 外设 @param advertisementData 相关的二进制数据 @param RSSI 信号强度 */- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary
       
         *)advertisementData RSSI:(NSNumber *)RSSI {        // 1.记录外设，必须要有数组进来行存储    if ([self.peripheralArray containsObject:peripheral]) {                [self.peripheralArray addObject:peripheral];    }    // 2.隐藏步骤，tableview表格列表（省略了）    // 3.连接外围设备    [self.mgr connectPeripheral:peripheral options:nil];    // 4.设置外设的代理    peripheral.delegate = self;        }// 连接到外设之后，会调用这个代理方法- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {        // 扫描服务    // 传nil代表扫描所有服务    [peripheral discoverServices:nil];    }#pragma CBPeripheralDelegate// 外设扫描里面的服务- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error {        // 获取外设的服务    for (CBService *service in peripheral.services) {                if ([service.UUID.UUIDString isEqualToString:@"123"]) {            // uuid一致，那就开始扫描特征            [peripheral discoverCharacteristics:nil forService:service];                    }    }}// 当发现到特征的时候会调用- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error {        //    for (CBCharacteristic *characteristic in service.characteristics) {                if ([characteristic.UUID.UUIDString isEqualToString:@"123456"]) {            //            [peripheral readValueForDescriptor:<#(nonnull CBDescriptor *)#>];            //            [peripheral writeValue:<#(nonnull NSData *)#> forDescriptor:<#(nonnull CBDescriptor *)#>];        }    }}- (NSMutableArray *)peripheralArray {        if (!_peripheralArray) {                _peripheralArray = [NSMutableArray array];    }    return _peripheralArray;}