IOS Bluetooth and ios Bluetooth

IOS Bluetooth and ios Bluetooth

# Bluetooth ## GameKit ### introduction: * For 'communication' between bluetooth devices, you can only use the 'same application' connection between iOS devices * The connection has expired since 'ios7 '* But GameKit is 'basic the 'bluetooth communication framework * enables file sharing through Bluetooth (only files in the device sandbox) * This framework is generally used for game development (for example, playing the game with five games) ## start case ### introduction: * connect two iOS devices through Bluetooth * search for the device of the other party * to send images from the mobile phone to the other party ### build the interface ### Bluetooth Interconnection: * search for the bluetooth device ''' // initialize the link to the Bluetooth controller GKPeerPickerController * peerCtr = [[GKPeerPickerController alloc] init]; // display the matching bluetooth device [peerCtr show]; ''' * 'gpeerpickercontroller' two most important proxies '''/*** link successful ** @ Param picker Bluetooth controller * @ param peerID the device id connecting to Bluetooth * @ param session connects to a Bluetooth session (Communication) for data transmission */-(void) peerPickerController :( GKPeerPickerController *) picker didConnectPeer :( NSString *) peerID toSession :( GKSession *) session {NSLog (@ "% s % d" ,__ func __,__ LINE __); // hide the Bluetooth controller [picker dismiss];} // exit connection-(void) peerPickerControllerDidCancel :( GKPeerPickerController *) picker {NSLog (@ "% s % d" ,__ func __, __line _);} ''' ### select an image :* Select image method ''' // select image-(IBAction) chooseImage {// 1. initialize the image and select the Controller UIImagePickerController * imgPicker = [[UIImagePickerController alloc] init]; // 2. determine whether the image library is available if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeSavedPhotosAlbum]) {// 3. set the image library open type imgPicker. sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; // 4. sets the proxy imgPicker. delegate = self; // 5. open gallery [self pr EsentViewController: imgPicker animated: YES completion: nil] ;}} ''' * select the proxy method of the image controller '''/*** image selection complete call ** @ param picker Image Selection controller * @ param info selected information */-( void) imagePickerController :( UIImagePickerController *) picker didFinishPickingMediaWithInfo :( NSDictionary <NSString *, id> *) info {NSLog (@ "info =%@", info ); // set the selected image to the current display image self. showImageView. image = info [UIImagePickerControllerOriginalImage]; // hide the current Select the image controller [picker dismissViewControllerAnimated: YES completion: nil];} ''' ### send images to each other: * You need to store the current session ''' in the proxy method of successful connection // Save the current session self. m_Session = session; ''' * method of sending an image ''' // send an image-(IBAction) sendImage {// obtain the image UIImage * image = self. showImageView. image; // convert the image to NSData type NSData * imgData = UIImagePNGRepresentation (image ); /*** send data to all matched users ** @ param GKSendDataMode: (safe/insecure) * GKSendDataUnreliable: Unsafe mode: Like sending 10 leaflets and dropping leaflets to the crowd, whether or not you can receive them, regardless of * GKSendDataReliable: Safe Mode: Like sending 10 leaflets, each leaflet must be sent to passers-by's hand before a leaflet is issued * @ return */[self. m_Session sendDataToAllPeers: imgData withDataMode: GKSendDataUnreliable error: nil];} ''' ### set the image: * The data accepted by GameKit is a method callback * You need to listen to the received data * set the listener '''/** in the proxy method for successful connection * setDataReceiveHandler: * withContext: the parameter to be passed in the listener */[session setDataReceiveHandler: self withContext: ni L]; ''' * listener Method * only sets who listens for the transmitted data, because we still cannot get the transmitted data, enter the header file of the listening method and you will see ''' // SEL =-receiveData: fromPeer: inSession: context: ''' *. Therefore, we must implement this method to obtain the received data, this callback method is explained in versions earlier than Xcode 7! [] (Clip/callback example .png) '''/*** callback Method for receiving data ** @ param data received data * @ param peer device ID for transmitting data * @ param session current session * @ param context registers the data transmitted by the listener */-(void) receiveData :( NSData *) data fromPeer :( NSString *) peer inSession: (GKSession *) session context :( void *) context {// because the image is passed, therefore, we directly use UIImage to accept UIImage * image = [UIImage imageWithData: data]; // set image self. showImageView. image = image ;}'''

# CoreBlueTooth ### Introduction: * It Can Be Used for third-party bluetooth device interaction, the device must support Bluetooth 4.0 * the iPhone device must be 4S or * The iPad device must be iPad mini or * the iOS system must be iOS 6 or * the Bluetooth 4.0 must be 'lower' famous, therefore, it is generally called BLE (bluetooth low energy) * use simulator debugging-Xcode 4.6-iOS 6.1 * Application Scenario + sports bracelet + Smart Home + lacala Bluetooth card reader ### core concept * CBCentralManager: central device (Butler used to connect to external devices) * CBPeripheralManager: External Device (third-party Bluetooth 4.0 device )! [] (Clip/BLE.jpeg) ### development step * create a central manager ''' // 1. create a central manager and set proxy self. cmgr = [[CBCentralManager alloc] initWithDelegate: self queue: nil]; ''' * scan peripherals (discover) ''' // 2. scan external devices in the proxy method/*** scanForPeripheralsWithServices: if the specified array is input, only devices with corresponding IDs in the array will be scanned * If nil is input, scan all the discovered devices * after scanning the external devices, the proxy */-(void) centralManagerDidUpdateState (CBCentralManager *) will be notified *) central {if ([central state] = CBCentralManagerState PoweredOn) {[self. cmgr scanForPeripheralsWithServices: nil options: nil] ;}}'''/*** external device discovery, this method is called every time a scan is found * so you can use an array to store the array completed each scan */-(void) centralManager :( CBCentralManager *) central didDiscoverPeripheral :( CBPeripheral *) peripheral advertisementData :( NSDictionary <NSString *, id> *) advertisementData (NSNumber *) RSSI {// may cause repeated scanning peripherals. // you must first determine whether the array contains this peripheral if (! [Self. peripherals containsObject: peripheral]) {[self. peripherals addObject: peripheral];} ''' * connect to peripherals '''/*** simulate the start connection method */-(void) start {// 3. connect the peripheral for (CBPeripheral * ppl in self. peripherals) {// scan the peripheral service // this operation should be performed by the proxy method of the peripheral device. // set the proxy ppl. delegate = self; [self. cmgr connectPeripheral: ppl options: nil] ;}} ''' * scan for services and features in peripherals-Relationship between services and features. Each Bluetooth 4.0 device displays its own services and features, A device must contain one or more services. Each Service contains several features. '''/*** Call peripherals successfully */-(void) centralManager :( CBCentralManager *) central didConnectPeripheral :( CBPeripheral *) peripheral {// query peripheral services [peripheral discoverServices: nil];} '''/*** the proxy method is called when the service is found. ** @ param peripheral peripherals */-(void) peripheral :( CBPeripheral *) peripheral didDiscoverServices :( NSError *) error {// scan all services of the device NSArray * services = peripheral. services; // scan the corresponding features of each service again based on the service. for (CBService * ses in services) {[peripheral discoverCharacteristics: nil forService: ses];} ''' * Data Interaction with peripherals-perform corresponding operations under the specified features '''/*** discover the characteristics of the Service */-(void) peripheral :( CBPeripheral *) peripheral didDiscoverCharacteristicsForService :( CBService *) service error :( NSError *) error {// feature NSArray * ctcs = service corresponding to the service. characteristics; // traverses all features for (CBCharacteristic * character in ctcs) {// filter if ([character. UUID. UUIDString isEqualToString: @ "XMG"]) {NSLog (@ "you can eat ");}}} ''' * disconnect '''/*** disconnect */-(void) stop {// disconnect all peripherals on the connection for (CBPeripheral * per in self. peripherals) {[self. cmgr cancelPeripheralConnection: per];} '''