藍牙API

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController


@end


#import "ViewController.h"
#import <CoreBluetooth/CoreBluetooth.h>
@interface ViewController ()<CBCentralManagerDelegate,CBPeripheralDelegate>

@property BOOL  cbReady;
@property (nonatomic,assign) float batteryValue;
@property (nonatomic,strong) CBCentralManager *manager;//
@property (nonatomic,strong) CBPeripheral *peripheral;//

@property (nonatomic,strong) CBCharacteristic *writeCharacteristic;

@property (nonatomic,strong) NSMutableArray *nDevices;
@property (nonatomic,strong) NSMutableArray *nServices;
@property (nonatomic,strong) NSMutableArray *nCharacteristics;


@property (nonatomic,strong)UIActivityIndicatorView *activity;//轉菊花

@property (nonatomic,strong)UILabel *peripheralName;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
   
    self.manager = [[CBCentralManager alloc]initWithDelegate:self queue:nil];
    _cbReady = false;
    

    [self.view addSubview:self.peripheralName];
    _nDevices = [[NSMutableArray alloc]init];
    _nServices = [[NSMutableArray alloc]init];
    _nCharacteristics = [[NSMutableArray alloc]init];
    

    _activity = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(100, 50, 50, 50)];
    _activity.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:_activity];
}
#pragma mark UI
-(UILabel*)peripheralName{
    if (!_peripheralName){
        _peripheralName = [[UILabel alloc]init];
        _peripheralName.frame = CGRectMake(100, 150, 200, 100);
        _peripheralName.backgroundColor = [UIColor orangeColor];
        _peripheralName.text = @"顯示鏈接設備名";
    }
    return _peripheralName;
}

#pragma mark print log
-(void)updatelog:(NSString *)str
{
    NSLog(@"%@",str);
    
}
#pragma mark bluetooth  delegate
-(void)centralManagerDidUpdateState:(CBCentralManager *)central{
    
    switch (central.state) {
        case CBCentralManagerStatePoweredOn:
            [self updatelog:@"藍牙已打開，請掃描外設"];
            [_activity startAnimating];
            [_manager scanForPeripheralsWithServices:nil options:nil];//
            break;
        case CBCentralManagerStatePoweredOff:
            [self updatelog:@"藍牙沒有打開，請先打開藍牙"];
            break;
        default:
            break;
    }

}

-(void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI{
    [self updatelog:[NSString stringWithFormat:@"已發現設備 %@ peripheral:\n  設備名稱%@  rssi:%@  ",peripheral,peripheral.name,RSSI]];
    
    _peripheral = peripheral;
    //鏈接外設
    [_manager connectPeripheral:_peripheral options:nil];
    _peripheralName.text = _peripheral.name;
 
    
    BOOL replace = NO;
    
    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];
        _peripheralName.text = _peripheral.name;
    }
    if ([_peripheral.name isEqualToString:@"B-ME31-354221"]){
        [self.manager stopScan];
        [_activity stopAnimating];
    }

}
//success  鏈接外設成功，開始發現服務
-(void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{

    [self.peripheral setDelegate:self];
    [self.peripheral discoverServices:nil];
    
}
//fail
-(void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{

    NSLog(@"%@",error);

}
//deprecated
//-(void)peripheralDidUpdateRSSI:(CBPeripheral *)peripheral error:(NSError *)error{
//
//}


//
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
    [self updatelog:@"發現服務"];
    int i = 0;
    for (CBService * s in peripheral.services){
        [self.nServices addObject:s];
    }
    //49535343-FE7D-4AE5-8FA9-9FAFD205E455
    for (CBService *s in peripheral.services){
    
        i++;
        [peripheral discoverCharacteristics:nil forService:s];
        
        if ([s.UUID isEqual:[CBUUID UUIDWithString:@"49535343-FE7D-4AE5-8FA9-9FAFD205E455"]]){
            BOOL replace = NO;
            
            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];
                _peripheralName.text = peripheral.name;
            
            }
        }
    
    }

}

//已搜索到的Characteristics
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
    [self updatelog:@"發現特徵服務"];
    for (CBCharacteristic *c in service.characteristics){
        
        [self updatelog:[NSString stringWithFormat:@"UUID:%@ UUIDString:%@，data%@",c.UUID,c.UUID.UUIDString,c.UUID.data]];

        
        if ([c.UUID isEqual:[CBUUID UUIDWithString:@"2A23"]]) {
            _writeCharacteristic = c;
        }
        if ([c.UUID isEqual:[CBUUID UUIDWithString:@"2A29"]]) {
            [_peripheral readValueForCharacteristic:c];
            [_peripheral setNotifyValue:YES forCharacteristic:c];
        }
        
        if ([c.UUID isEqual:[CBUUID UUIDWithString:@"2A24"]]) {
            [_peripheral readValueForCharacteristic:c];
        }
        
        if ([c.UUID isEqual:[CBUUID UUIDWithString:@"2A25"]]) {
            [_peripheral readValueForCharacteristic:c];
            [_peripheral setNotifyValue:YES forCharacteristic:c];
        }
        
        if ([c.UUID isEqual:[CBUUID UUIDWithString:@"2A2A"]]) {
            [_peripheral readRSSI];
        }
        
        [_nCharacteristics addObject:c];
//log
//        2016-06-17 14:24:30.722 BlueToothDemo[27905:17730659] UUID:System ID UUIDString:2A23，data<2a23>
//        2016-06-17 14:24:30.723 BlueToothDemo[27905:17730659] UUID:Manufacturer Name String UUIDString:2A29，data<2a29>
//        2016-06-17 14:24:30.723 BlueToothDemo[27905:17730659] UUID:Model Number String UUIDString:2A24，data<2a24>
//        2016-06-17 14:24:30.723 BlueToothDemo[27905:17730659] UUID:Serial Number String UUIDString:2A25，data<2a25>
//        2016-06-17 14:24:30.723 BlueToothDemo[27905:17730659] UUID:Firmware Revision String UUIDString:2A26，data<2a26>
//        2016-06-17 14:24:30.723 BlueToothDemo[27905:17730659] UUID:Hardware Revision String UUIDString:2A27，data<2a27>
//        2016-06-17 14:24:30.724 BlueToothDemo[27905:17730659] UUID:Software Revision String UUIDString:2A28，data<2a28>
//        2016-06-17 14:24:30.724 BlueToothDemo[27905:17730659] UUID:IEEE Regulatory Certification UUIDString:2A2A，data<2a2a>
//        2016-06-17 14:24:30.871 BlueToothDemo[27905:17730659] 發現特徵服務
//        2016-06-17 14:24:30.871 BlueToothDemo[27905:17730659] UUID:49535343-6DAA-4D02-ABF6-19569ACA69FE UUIDString:49535343-6DAA-4D02-ABF6-19569ACA69FE，data<49535343 6daa4d02 abf61956 9aca69fe>
//        2016-06-17 14:24:30.871 BlueToothDemo[27905:17730659] UUID:49535343-ACA3-481C-91EC-D85E28A60318 UUIDString:49535343-ACA3-481C-91EC-D85E28A60318，data<49535343 aca3481c 91ecd85e 28a60318>
//        2016-06-17 14:24:30.872 BlueToothDemo[27905:17730659] UUID:49535343-8841-43F4-A8D4-ECBE34729BB3 UUIDString:49535343-8841-43F4-A8D4-ECBE34729BB3，data<49535343 884143f4 a8d4ecbe 34729bb3>
//        2016-06-17 14:24:30.872 BlueToothDemo[27905:17730659] UUID:49535343-1E4D-4BD9-BA61-23C647249616 UUIDString:49535343-1E4D-4BD9-BA61-23C647249616，data<49535343 1e4d4bd9 ba6123c6 47249616>
    }
}
//斷開與設備鏈接
-(void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{
    [self updatelog:[NSString stringWithFormat:@"已斷開與設備%@鏈接",peripheral.name]];

   UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"" message:[NSString stringWithFormat:@"已斷開與設備%@鏈接",peripheral.name] preferredStyle:UIAlertControllerStyleAlert];

   UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"從新鏈接" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
        [_manager connectPeripheral:_peripheral options:nil];
    }];
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"好的" style:UIAlertActionStyleDefault handler:nil];
    [alertController addAction:cancelAction];
    [alertController addAction:okAction];
    [self presentViewController:alertController animated:YES completion:nil];
}

//獲取外設發來的數據
-(void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
    [self updatelog:[NSString stringWithFormat:@"%@",characteristic]];
    NSData *data = characteristic.value;
    Byte *resultByte = (Byte *)[data bytes];
    NSLog(@"%s  %ld",resultByte,[data length]);//Ampak  5  ， 6210B  5 ，  £F  6
}


@end

參考文章：http://doc.okbase.net/kw-ios/archive/94529.html

                http://blog.csdn.net/dolacmeng/article/details/46457487

                http://www.jianshu.com/p/84b5b834b942

                http://www.jianshu.com/p/0bc96af31f10