藍牙是開發(fā)中常用的功能。通過手機APP與硬件設備連接，進而操作硬件，在開發(fā)中越來越常見。
藍牙的理論知識可自行從網上搜索，此處只介紹如何在項目中通過代碼集成藍牙功能。
集成藍牙SDK時，用到的是iOS自帶的SDK，在pch文件或者是用到藍牙的某個類（此處小編假設用到藍牙的是自定義的BlueTooth類）的頭部引入：
#import <CoreBluetooth/CoreBluetooth.h>
在BlueTooth類中聲明一下屬性
@property (nonatomic, strong) CBCentralManager *manager;//藍牙的中心管理者
@property (nonatomic, strong) CBPeripheral *peripheral;
@property (strong ,nonatomic) CBCharacteristic *writeCharacteristic;//藍牙的寫特征
@property (nonatomic,strong) CBCharacteristic *readCharacteristic;//藍牙的讀特征
@property (nonatomic,strong) CBCharacteristic *vedioCharacteristic;
@property (nonatomic,strong) CBCharacteristic *batteryCharacteristic;//藍牙的電池特征，可以檢測電池電量
@property (nonatomic,strong) CBCharacteristic *stateCharacteristic;//藍牙的狀態(tài)特征，檢測是否連接
@property (strong,nonatomic) NSMutableArray *nDevices;//搜索到的所有藍牙設備
@property (strong,nonatomic) NSMutableArray *nServices;//當前匹配的藍牙設備的所有服務
@property (strong,nonatomic) NSMutableArray *nCharacteristics;//當前匹配的藍牙設備的所有特征
在BlueTooth類中加入藍牙代理
<CBCentralManagerDelegate,CBPeripheralDelegate>
在BlueTooth類的viewDidLoad方法中初始化：
_manager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
_nDevices = [[NSMutableArray alloc]init];?
_nServices = [[NSMutableArray alloc]init];
_nCharacteristics = [[NSMutableArray alloc]init];
點擊頁面的某個button，點擊方法中開始掃描周圍的藍牙設備：
[_manager scanForPeripheralsWithServices:nil options:nil];
#pragma mark 查到外設后，停止掃描，連接設備
-(void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{
? ? NSLog(@"已發(fā)現(xiàn) peripheral: %@ ---%@--rssi: %@,---UUID: %@ --advertisementData: %@ ", peripheral, peripheral.name,RSSI, peripheral.identifier, advertisementData);
? ? [peripheral setDelegate:self];
? ? [peripheral discoverServices:nil];
? ? NSString *blueName = peripheral.name;
? ? if([你要查找的設備名稱 isEqualToString:blueName]){
? ? ? ? ? ? self.peripheral = peripheral;//找到需要的外設，并賦值
? ? ? ? ? ? [_manager connectPeripheral:_peripheral options:@{CBConnectPeripheralOptionNotifyOnConnectionKey : @YES }];
? ? ? ? ? ? [self.manager stopScan];
? ? ? ? }else{
????????????//如果查到的設備名稱不是你需要的，繼續(xù)查找
? ? ? ? }
? ? ? ? BOOL replace = NO;
? ? ? ? // Match if we have this device from before
? ? ? ? //搜索到的藍牙，在設備數(shù)組遍歷，如果曾經沒有連接過這個藍牙，就添加，如果鏈接過，則替換
? ? ? ? for (int i=0; i < _nDevices.count; i++) {
? ? ? ? ? ? CBPeripheral *p = [_nDevices objectAtIndex:i];
????????????if ([p isEqual:peripheral]) {
????????????????[_nDevices replaceObjectAtIndex:i withObject:peripheral];
? ? ? ? ? ? ? ? replace = YES;
? ? ? ? ? ? }
? ? ? ? }
? ? ? ? if (!replace) {
? ? ? ? ? ? [_nDevices addObject:peripheral];
? ? ? ? }
? ? }
}
//連接外設失敗
-(void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{
? ? NSLog(@"鏈接外設失敗%@",error);
}
#pragma mark 連接外設后的處理
//連接外設成功，開始發(fā)現(xiàn)服務
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {
?? ?[self.peripheral setDelegate:self];
? ? [self.peripheral discoverServices:nil];
? ? NSLog(@"掃描服務");
}
#pragma mark 發(fā)現(xiàn)服務和搜索到的Characteristice
//已發(fā)現(xiàn)服務
-(void) peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
? ? NSLog(@"發(fā)現(xiàn)服務!");
? ? int i = 0;
? ? for(CBService* s in peripheral.services){
? ? ? ? [self.nServices addObject:s];
? ? }
? ? for(CBService* s in peripheral.services){
?????????//NSLog(@"%d :服務 UUID: %@(%@)", i, s.UUID.data, s.UUID);
? ? ? ? i++;
? ? ? ? [peripheral discoverCharacteristics:nil forService:s];
? ? ? ? //NSLog(@"掃描Characteristics...");
? ? }
}
#pragma mark? 已搜索到Characteristics
-(void) peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
? ? for(CBCharacteristic* c in service.characteristics){
? ? ? ? [peripheral readValueForCharacteristic:c];
? ? ? ? //NSLog(@"特征 UUID:? %@-- %@-- (%@)", c,c.UUID.data, c.UUID);
? ? ? ? [peripheral setNotifyValue:YES forCharacteristic:c];
? ? ? ? if([c.UUID isEqual:[CBUUID UUIDWithString:@"FFF1"]]){ //寫
? ? ? ? ? ? self.writeCharacteristic = c;
? ? ? ? ? ? [peripheral readValueForCharacteristic:c];
? ? ? ? }else if([c.UUID isEqual:[CBUUID UUIDWithString:@"FFF2"]]){//讀
? ? ? ? ? ? self.readCharacteristic = c;
? ? ? ? ? ? [peripheral readValueForCharacteristic:c];
? ? ? ? }else if ([c.UUID isEqual:[CBUUID UUIDWithString:@"2a19"]]){//電池電量
? ? ? ? ? ? self.batteryCharacteristic = c;
? ? ? ? }
? ? ? ? uint8_t val[c.value.length];
? ? ? ? [c.value getBytes:val length:c.value.length];
? ? ? ? if([c.UUID.UUIDString isEqualToString:@"FFF6"]){
? ? ? ? ? ? self.stateCharacteristic = c;
? ? ? ? ? ? [peripheral readValueForCharacteristic:c];
? ? ? ? ? ? [peripheral setNotifyValue:YES forCharacteristic:c];
? ? ? ? }
? ? }
}
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error {
? ? NSLog(@"已斷開與設備:[%@]的連接",peripheral.name);
}
//獲取外設發(fā)來的數(shù)據(jù)，不論是read和notify,獲取數(shù)據(jù)都是從這個方法中讀取。
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
? ? NSData *data = characteristic.value;
? ? NSString* value = [self hexadecimalString:data];
? ? if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:@"FFF2"]]) {
? ? }else if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:@"2a19"]]){//電池
? ? ? ? NSData *data = characteristic.value;
? ? ? ? NSString *value = [self hexadecimalString:data];
? ? ? ? NSString * temp10 = [NSString stringWithFormat:@"%lu",strtoul([value UTF8String],0,16)];
? ? ? ? //NSLog(@"電池----%@",temp10);
? ? }else{
? ? ? ? //NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
? ? ? ? //NSLog(@"其他的特征值--%@",value);
? ? }
}
當你找到了相應的藍牙設備，并且需要向藍牙設備發(fā)送數(shù)據(jù)的時候，調用以下方法。
if (characteristic.properties & CBCharacteristicPropertyWrite) {
? ? ? ? // 寫入數(shù)據(jù)
? ? ? ? [peripheral writeValue:data forCharacteristic:_writeCharacteristic type:CBCharacteristicWriteWithResponse];
? ? }
以上是集成藍牙的全部代碼，不明白的可以留言。具體的操作還需要iOS開發(fā)人員和公司的硬件工程師進行配合。
