第一步，先创建一个中心设备
#import "ViewController.h"
#import <CoreBluetooth/CoreBluetooth.h>
@interface ViewController ()<CBCentralManagerDelegate,CBPeripheralDelegate>
@property (nonatomic,strong) CBCentralManager *myCentralManager;
@property (nonatomic,strong) CBPeripheral *myPeripheral;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
#pragma mark 1 Starting Up a Central Manager(启动一个Central Manager)
//这里的queue如果为nil就会在主线程
self.myCentralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}
第二步，扫描外设
#pragma mark 2 扫描外设（discover），扫描外设的方法我们放在centralManager成功打开的委托中，因为只有设备成功打开，才能开始扫描，否则会报错。
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
//开始扫描周围的外设
if(central.state == CBCentralManagerStatePoweredOn)
{
//第一个参数nil就是扫描周围所有的外设
[self.myCentralManager scanForPeripheralsWithServices:nil options:nil];
}
}
第三步 连接外设(connect)
#pragma mark 3 连接外设(connect)
//扫描到设备会进入方法
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
NSLog(@"当扫描到设备:%@",peripheral.name);
//这里自己去设置下连接规则，我设置的是8结尾的设备
if([peripheral.name hasSuffix:@"8"])
{//一个主设备最多能连7个外设，每个外设最多只能给一个主设备连接,连接成功，失败，断开会进入各自的委托
//停止搜索
[self.myCentralManager stopScan];
//这里先将peripheral值保存一下，有时会自动销毁导致连接不上
self.myPeripheral = peripheral;
//连接外设
[self.myCentralManager connectPeripheral:self.myPeripheral options:nil];
}
}
//连接到Peripherals-失败
- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
NSLog(@"===>>>连接到名称为（%@）的设备-失败,原因:%@",[peripheral name],[error localizedDescription]);
}
//Peripherals断开连接
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
NSLog(@"===>>>外设连接断开连接 %@: %@\n", [peripheral name], [error localizedDescription]);
}
第四步 扫描外设中的服务和特征(discover)
#pragma mark 4 扫描外设中的服务和特征(discover)
//连接到Peripherals-成功
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
NSLog(@"===>>>连接到名称为（%@）的设备-成功",peripheral.name);
//设置的peripheral委托CBPeripheralDelegate
[peripheral setDelegate:self];
//扫描外设Services
[peripheral discoverServices:nil];
}
//扫描到Services
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
NSLog(@"===>>>扫描到服务：%@",peripheral.services);
if (error)
{
NSLog(@"===>>>Discovered services for %@ with error: %@", peripheral.name, [error localizedDescription]);
return;
}
for (CBService *service in peripheral.services)
{
NSLog(@"%@",service.UUID);
//扫描每个service的Characteristics
[peripheral discoverCharacteristics:nil forService:service];
}
}
第五步 与外设做数据交互
#pragma mark 5 与外设做数据交互
//扫描到Characteristics
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
if (error)
{
NSLog(@"error Discovered characteristics for %@ with error: %@", service.UUID, [error localizedDescription]);
return;
}
for (CBCharacteristic *characteristic in service.characteristics)
{
NSLog(@"service:%@ 的 Characteristic: %@",service.UUID,characteristic.UUID);
}
//获取Characteristic的值
for (CBCharacteristic *characteristic in service.characteristics)
{
[peripheral readValueForCharacteristic:characteristic];
}
//搜索Characteristic的Descriptors
for (CBCharacteristic *characteristic in service.characteristics)
{
[peripheral discoverDescriptorsForCharacteristic:characteristic];
}
}
//获取的charateristic的值
-(void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
//打印出characteristic的UUID和值
//!注意，value的类型是NSData，具体开发时，会根据外设协议制定的方式去解析数据
NSLog(@"characteristic uuid:%@ value:%@",characteristic.UUID,characteristic.value);
//写入数据到外设中
// [self.myPeripheral writeValue:<#(nonnull NSData *)#> forCharacteristic:<#(nonnull CBCharacteristic *)#> type:<#(CBCharacteristicWriteType)#>]
}
//搜索到Characteristic的Descriptors
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverDescriptorsForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
//打印出Characteristic和他的Descriptors
NSLog(@"characteristic uuid:%@",characteristic.UUID);
for (CBDescriptor *d in characteristic.descriptors) {
NSLog(@"Descriptor uuid:%@",d.UUID);
}
}
//获取到Descriptors的值
-(void)peripheral:(CBPeripheral *)peripheral didUpdateValueForDescriptor:(CBDescriptor *)descriptor error:(NSError *)error{
//打印出DescriptorsUUID 和value
//这个descriptor都是对于characteristic的描述，一般都是字符串，所以这里我们转换成字符串去解析
NSLog(@"characteristic uuid:%@ value:%@",[NSString stringWithFormat:@"%@",descriptor.UUID],descriptor.value);
//写入数据到外设中
// [self.myPeripheral writeValue:<#(nonnull NSData *)#> forDescriptor:<#(nonnull CBDescriptor *)#>]
}
