iOS开发蓝牙 蓝牙4.0的各种踩过的坑，希望你们少踩点

1.首先建立这个三个参数

@property (nonatomic,strong)CBCentralManager * manager;
@property (nonatomic,strong)CBPeripheral     * peripheral;
@property (nonatomic,strong)CBCharacteristic *writeDataCharacteristic

2、初始化CBCentralManager

-(CBCentralManager *)manager
{
if (!_manager )
{
_manager  = [[CBCentralManager alloc]initWithDelegate:self queue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) options:nil];

}
return _manager;
}

3.开始扫描蓝牙

[self.manager scanForPeripheralsWithServices:nil options:@{CBCentralManagerRestoredStateScanOptionsKey:@(YES)}];

4.当蓝牙状态改变的时候就会调用这个方法

- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
switch (central.state) {
case CBCentralManagerStateUnknown:
//设备不支持的状态
NSLog(@">>>CBCentralManagerStateUnknown");

{
dispatch_async(dispatch_get_main_queue(), ^{
ALERTVIEW(@"设备不支持");

});

}
break;
case CBCentralManagerStateResetting:
//正在重置状态
{
dispatch_async(dispatch_get_main_queue(), ^{
ALERTVIEW(@"正在重置状态");

})  ;
}
NSLog(@">>>CBCentralManagerStateResetting");
break;
case CBCentralManagerStateUnsupported:
//设备不支持的状态
{
dispatch_async(dispatch_get_main_queue(), ^{
ALERTVIEW(@"设备不支持的状态");

});

}
NSLog(@">>>CBCentralManagerStateUnsupported");
break;
case CBCentralManagerStateUnauthorized:

// 设备未授权状态
{
dispatch_async(dispatch_get_main_queue(), ^{
ALERTVIEW(@"设备未授权状态");

});

}
NSLog(@">>>CBCentralManagerStateUnauthorized");
break;
case CBCentralManagerStatePoweredOff:
//设备关闭状态
{
dispatch_async(dispatch_get_main_queue(), ^{
ALERTVIEW(@"设备关闭状态");

});

}
NSLog(@">>>CBCentralManagerStatePoweredOff");
break;
case CBCentralManagerStatePoweredOn:
NSLog(@">>>CBCentralManagerStatePoweredOn");
//开始扫描周围的外设

[self.manager scanForPeripheralsWithServices:nil options:@{CBCentralManagerRestoredStateScanOptionsKey:@(YES)}];

break;
default:
break;
}

}

5.连接外围设备

- (void)connect:(CBPeripheral *)peripheral
{
// 连接外围设备
[self.manager connectPeripheral:peripheral options:nil];
}

6.连接玩设备就调用成功的方法，然后开始扫描

//连接到Peripherals-成功 //扫描外设中的服务和特征  连接上外围设备的时候会调用该方法
- (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
//@interface ViewController : UIViewController
[peripheral setDelegate:self];
//扫描外设Services，成功后会进入方法：-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
[peripheral discoverServices: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]);
}

7.发现服务和设备的服务设备services

//发现服务
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{

NSLog(@"Discovered services for %@ ", peripheral.name);
if (![self.dataSourceArray containsObject:peripheral])
{
[self.dataSourceArray addObject:peripheral];
NSLog(@"%@",peripheral);
dispatch_async(dispatch_get_main_queue(), ^{
[_tableView reloadData];
});

}

}

/**
*  发现外围设备的服务会来到该方法(扫描到服务之后直接添加peripheral的services)
*/
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{

NSLog(@"发现外围设备的服务");
for (CBService *serivce in peripheral.services) {
NSLog(@"====%@------%@+++++++",serivce.UUID.UUIDString,self.peripheral.identifier);
if ([serivce.UUID.UUIDString isEqualToString:UUIDSTR_ISSC_PROPRIETARY_SERVICE]) {
// characteristicUUIDs : 可以指定想要扫描的特征(传nil,扫描所有的特征)
[peripheral discoverCharacteristics:nil forService:serivce];
}
}
}

8.找到了设备的服务然后扫描特征

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
NSLog(@"发现外围设备的特征");

for (CBCharacteristic *characteristic in service.characteristics) {
NSLog(@"====%@------+",characteristic.UUID.UUIDString);

if ([characteristic.UUID.UUIDString isEqualToString:UUIDSTR_ISSC_TRANS_TX]) {
// 拿到特征,和外围设备进行交互

[self notifyCharacteristic:peripheral characteristic:characteristic];
}
}
for (CBCharacteristic *characteristic in service.characteristics) {
NSLog(@"====%@------+",characteristic.UUID.UUIDString);

if ([characteristic.UUID.UUIDString isEqualToString:UUIDSTR_ISSC_TRANS_RX]) {
// 拿到特征,和外围设备进行交互   保存写的特征
self.writeDataCharacteristic = characteristic;

}
}
}

9.最后一步要写上通知这个一定要写上

//设置通知
-(void)notifyCharacteristic:(CBPeripheral *)peripheral
characteristic:(CBCharacteristic *)characteristic{
//设置通知，数据通知会进入：didUpdateValueForCharacteristic方法
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
[self.manager stopScan];

}

//取消通知
-(void)cancelNotifyCharacteristic:(CBPeripheral *)peripheral
characteristic:(CBCharacteristic *)characteristic{

[peripheral setNotifyValue:NO forCharacteristic:characteristic];
}

10.大功告成只差一步就是写数据

//写数据
-(void)writeCharacteristic:(CBPeripheral *)peripheral
characteristic:(CBCharacteristic *)characteristic
value:(NSData *)value
{
//只有 characteristic.properties 有write的权限才可以写
if(characteristic.properties & CBCharacteristicPropertyWrite){
/*
最好一个type参数可以为CBCharacteristicWriteWithResponse或type:CBCharacteristicWriteWithResponse,区别是是否会有反馈
*/
[peripheral writeValue:value forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
}else{
NSLog(@"该字段不可写！");
}
}

11.希望能帮到人，让别人少走点坑。