iOS 蓝牙(GameKit CoreBluetooth)

　　利用GameKit框架实现ios设备的蓝牙通讯，导入框架：#import <GameKit/GameKit.h>  , 注意: 此框架只能用于ios设置间蓝牙通讯

　　如今苹果开放了接口来实现不仅限于在苹果设备间的蓝牙通讯，需要导入框架：#import <CoreBluetooth/CoreBluetooth.h>

　　首先，利用GameKit框架实现ios设备蓝牙通讯

　　基本属性和方法：

　　属性：

• 是否可见：visible
• 蓝牙连接类型：connectionTypesMask

　　方法：

• 显示蓝牙控制器：- (void)show;
• 隐藏蓝牙控制器：- (void)dismiss;
• 蓝牙连接成功会调用：- (void)peerPickerController:(GKPeerPickerController *)picker didConnectPeer:(NSString *)peerID toSession:(GKSession *)session
• 取消蓝牙连接：- (void)peerPickerControllerDidCancel:(GKPeerPickerController *)picker
• 接收到数据会调用：- (void) receiveData:(NSData *)data fromPeer:(NSString *)peer inSession: (GKSession *)session context:(void *)context
• 发送数据给特定的对端蓝牙设备：self.session sendData:<#(NSData *)#> toPeers:<#(NSArray *)#> withDataMode:<#(GKSendDataMode)#> error:<#(NSError *__autoreleasing *)#>  
• 发送数据给所有蓝牙设备：self.session sendDataToAllPeers:<#(NSData *)#> withDataMode:<#(GKSendDataMode)#> error:<#(NSError *__autoreleasing *)#>

　　实现：

#import "WYSViewController.h"
#import <GameKit/GameKit.h>

@interface WYSViewController () <GKPeerPickerControllerDelegate>

// 会话
@property (nonatomic,strong) GKSession *session;

@end

@implementation WYSViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    
    // 创建蓝牙控制器
    GKPeerPickerController *peerPk = [[GKPeerPickerController alloc] init];
    
    // 代理
    peerPk.delegate = self;
    
    // 显示蓝牙控制器
    [peerPk show];
}

#pragma mark - 蓝牙代理方法
// 蓝牙连接成功会调用
- (void)peerPickerController:(GKPeerPickerController *)picker didConnectPeer:(NSString *)peerID toSession:(GKSession *)session
{
    // 保存回话
    self.session = session;
    
    // 设置接收者
    [self.session setDataReceiveHandler:self withContext:nil];
    
    
    // 关闭控制器
    [picker dismiss];
}

// 取消连接调用
- (void)peerPickerControllerDidCancel:(GKPeerPickerController *)picker
{

}

// 接收到数据会调用
- (void) receiveData:(NSData *)data fromPeer:(NSString *)peer inSession: (GKSession *)session context:(void *)context
{
    NSLog(@"%@",data);
}


- (IBAction)sendData
{
    // 发送数据去某些蓝牙设备
    // NSData * :要发送的数据
    // NSArray * : 蓝牙设备
    // GKSendDataMode:枚举模式
//    self.session sendData:<#(NSData *)#> toPeers:<#(NSArray *)#> withDataMode:<#(GKSendDataMode)#> error:<#(NSError *__autoreleasing *)#>
    
    // 发送数据去所有蓝牙设备
//    self.session sendDataToAllPeers:<#(NSData *)#> withDataMode:<#(GKSendDataMode)#> error:<#(NSError *__autoreleasing *)#>
}

　　

　　利用CoreBluetooth实现蓝牙通讯：

　　基本的思路：创建中心设备-->扫描外设-->连接外设-->扫描外设的服务和特征-->利用特征和外设进行数据交互-->断开连接

　　基本方法和属性：

　　属性：

• 中心管理设备类：CBCentralManager
• 中心管理设备代理：id<CBCentralManagerDelegate> delegate
• 中心管理设备状态：CBCentralManagerState state
• 外设类：CBPeripheral
• 服务类：CBService
• 特征类：CBCharacteristic

　　方法：

• 扫描外设：- (void)scanForPeripheralsWithServices:(NSArray *)serviceUUIDs options:(NSDictionary *)options;
• 停止扫描：- (void)stopScan;
• 连接外设：- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
• 外设连接成功调用：- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
• 外设连接失败调用：- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
• 扫描到服务就会调用：- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
• 扫描到特征就会调用：- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error

　　具体实现：

#import "WYSViewController.h"
#import <CoreBluetooth/CoreBluetooth.h>

@interface WYSViewController () <CBCentralManagerDelegate,CBPeripheralDelegate>

// 中心设备
@property (nonatomic,strong) CBCentralManager *cbMgr;

// 全部的外部设备
@property (nonatomic,strong) NSMutableArray *Peripherals;

@end

@implementation WYSViewController

// 懒加载
- (NSMutableArray *)Peripherals
{
    if (!_Peripherals){
        
        _Peripherals = [NSMutableArray array];
    }
    
    return _Peripherals;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    
    // 创建中心设备
    CBCentralManager *cbMgr = [[CBCentralManager alloc] init];
    self.cbMgr = cbMgr;
    
    // 代理
    cbMgr.delegate = self;
    
    // 扫描外设
    [cbMgr scanForPeripheralsWithServices:nil options:nil];
}


#pragma mark - CBCentralManager代理方法
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
        // 扫描到得外设
        if (![self.Peripherals containsObject:peripheral]){
            
            // 外设代理
            peripheral.delegate = self;
            
            [self.Peripherals addObject:peripheral];
        }
}

// 连接外设
- (IBAction)peripheralConnectSuccess
{
    for (CBPeripheral *peripheral in self.Peripherals) {
        
        // 连接外设
        [self.cbMgr connectPeripheral:peripheral options:nil];
    }
}


// 外设连接成功会调用
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    // 扫描服务
    [peripheral discoverServices:nil];
}

// 外设连接失败
 
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
    
}

#pragma mark - Peripheral代理
// 扫描到服务就会调用
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
    NSArray *services = peripheral.services;
    for (CBService *service in services) {
        
        // 某服务存在
        if ([service.UUID.UUIDString isEqualToString:@"xxx"]){
            
            [peripheral discoverCharacteristics:nil forService:service];
        }
    }
}

// 扫描到特征就会调用
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
    NSArray *characters = service.characteristics;
    
    for (CBCharacteristic *character in characters) {
        
        if ([character.UUID.UUIDString isEqualToString:@"xxx"]){
            
            // 进行设置
        }
    }
}