ios 保证蓝牙在app生命周期内一直在后台运行
关于ios蓝牙开发请见我的另一篇博客：http://my.oschina.net/OSChinaKANON/blog/401851
现在ios和蓝牙连接时关于蓝牙的操作我想大致应该就是放在ViewController和AppDelegate中。如果app中只是某个页面需要连接蓝牙并获得数据，那蓝牙委托代理可以直接放在该ViewController中，网上大多demo都这样，操作都比较简洁。但是如果app中多个页面都需要获取蓝牙数据，这时候还将蓝牙委托代理放在ViewController中的话，需要将数据进行存储，sqlite或者CoreData都可以，但是别的页面再向存储容器中去取数据，虽然可行，但显然比较麻烦。所以我想介绍下AppDelegate中设置蓝牙的代理：
如果觉得将所有的委托函数都写在AppDelegate中显得臃肿的话，可以自己封装一层，推荐个开源APi：BabyBluetooth。
将委托设置在Appdelegate中
//NSMutableArray *peripherals;
//初始化BabyBluetooth 蓝牙库
baby = [BabyBluetooth shareBabyBluetooth];
//设置蓝牙委托
[self babyDelegate];
//详见BabyBluetooth
//蓝牙网关初始化和委托方法设置
-(void)babyDelegate{
//__weak typeof(self) weakSelf = self;
__weak typeof(self) weakSelf = self;
[baby setBlockOnCentralManagerDidUpdateState:^(CBCentralManager *central) {
if (central.state == CBCentralManagerStatePoweredOn) {
[SVProgressHUD showInfoWithStatus:@"设备打开成功，开始扫描设备"];
[weakSelf StartScan];
}
}];
//设置扫描到设备的委托
[baby setBlockOnDiscoverToPeripherals:^(CBCentralManager *central, CBPeripheral *peripheral, NSDictionary *advertisementData, NSNumber *RSSI) {
NSLog(@"搜索到了设备:%@",peripheral.name);
Myperipheral=peripheral;
if ([peripheral.name isEqualToString:@"YK661DM20A"]) {
Myperipheral=peripheral;
[weakSelf StartdiscoverServices:peripheral];
}
//[weakSelf insertTableView:peripheral];
}];
//设置设备连接成功的委托
[baby setBlockOnConnected:^(CBCentralManager *central, CBPeripheral *peripheral) {
NSLog(@"设备：%@--连接成功",peripheral.name);
//Myperipheral=peripheral;
//[weakSelf StartdiscoverServices];
}];
//设置设备连接失败的委托
[baby setBlockOnFailToConnect:^(CBCentralManager *central, CBPeripheral *peripheral, NSError *error) {
NSLog(@"设备：%@--连接失败",peripheral.name);
}];
//设置设备断开连接的委托
[baby setBlockOnDisconnect:^(CBCentralManager *central, CBPeripheral *peripheral, NSError *error) {
NSLog(@"设备：%@--断开连接",peripheral.name);
}];
//设置发现设备的Services的委托
[baby setBlockOnDiscoverServices:^(CBPeripheral *peripheral, NSError *error) {
for (CBService *service in peripheral.services) {
NSLog(@"搜索到服务:%@",service.UUID.UUIDString);
[weakSelf insertSectionToTableView:service];
}
}];
//设置发现设service的Characteristics的委托
[baby setBlockOnDiscoverCharacteristics:^(CBPeripheral *peripheral, CBService *service, NSError *error) {
for (CBCharacteristic *c in service.characteristics) {
NSLog(@"charateristic name is :%@",c.UUID);
}
[weakSelf insertRowToTableView:service];
}];
//设置读取characteristics的委托
[baby setBlockOnReadValueForCharacteristic:^(CBPeripheral *peripheral, CBCharacteristic *characteristics, NSError *error) {
NSLog(@"characteristic name:%@ value is:%@",characteristics.UUID,characteristics.value);
}];
//设置发现characteristics的descriptors的委托
[baby setBlockOnDiscoverDescriptorsForCharacteristic:^(CBPeripheral *peripheral, CBCharacteristic *characteristic, NSError *error) {
NSLog(@"===characteristic name:%@",characteristic.service.UUID);
for (CBDescriptor *d in characteristic.descriptors) {
NSLog(@"CBDescriptor name is :%@",d.UUID);
}
}];
//设置读取Descriptor的委托
[baby setBlockOnReadValueForDescriptors:^(CBPeripheral *peripheral, CBDescriptor *descriptor, NSError *error) {
NSLog(@"Descriptor name:%@ value is:%@",descriptor.characteristic.UUID, descriptor.value);
}];
//设置查找设备的过滤器
[baby setFilterOnDiscoverPeripherals:^BOOL(NSString *peripheralName) {
//设置查找规则是名称大于1 ， the search rule is peripheral.name length > 2
if ([peripheralName isEqualToString:@"YK661DM20A"]) {
return YES;
}
return NO;
}];
}
下面是我利用BabyBluetooth封装的一些方法，用语蓝牙的初始化／扫描／连接／发送命令／监听&&接收数据
-(void)BleInit{
//初始化其他数据 init other
peripherals = [[NSMutableArray alloc]init];
//初始化BabyBluetooth 蓝牙库
baby = [BabyBluetooth shareBabyBluetooth];
//设置蓝牙委托
self.services = [[NSMutableArray alloc]init];
[self babyDelegate];
}
-(void)StartScan{
//停止之前的连接
[baby cancelAllPeripheralsConnection];
//设置委托后直接可以使用，无需等待CBCentralManagerStatePoweredOn状态。
baby.scanForPeripherals().begin();
}
-(void)StartdiscoverServices:(CBPeripheral*)Per{
baby.having(Per).and.connectToPeripherals().and.discoverServices().and.discoverCharacteristics().begin();
}
-(void)Record{
CBCharacteristic *recordBuf = [BabyToy findCharacteristicFormServices:self.services UUIDString:@"xxxxxx"];
//设置要监听的服务特征值
if (recordBuf) {
[Myperipheral setNotifyValue:YES forCharacteristic:recordBuf];
}
}
-(void)SendStart{
NSString *value=@"xxxxxxxxx";
// 设置要发送的命令（开始发送数据）
NSData *data = [self dataWithHexstring:value];
CBCharacteristic *currentCharacteristic = [BabyToy findCharacteristicFormServices:self.services UUIDString:@"xxxxxxxx"];
//设置要发送的服务特征值
[Myperipheral writeValue:data forCharacteristic:currentCharacteristic type:CBCharacteristicWriteWithResponse];
}
-(void)SendEnd{
NSString *value=@"xxxxxxxx";
// 设置要发送的命令（停止发送数据）
NSData *data = [self dataWithHexstring:value];
CBCharacteristic *currentCharacteristic = [BabyToy findCharacteristicFormServices:self.services UUIDString:@"xxxxxxxxx"];
//设置要发送的服务特征值
[Myperipheral writeValue:data forCharacteristic:currentCharacteristic type:CBCharacteristicWriteWithResponse];
}
到此为止，Appdelegate设置基本完成，扫描和连接可以放在Appdelegate中完成，接下来可以在其他ViewController中调用AppDelegate方法来设置蓝牙发送和停止发送数据，其他的操作其实也可以添加。
//@property(nonatomic) AppDelegate *delegate;
//监听蓝牙并发送命令给蓝牙使开始发送数据
delegate=(AppDelegate*)[[UIApplication sharedApplication]delegate];
[delegate Record];
[delegate SendStart];
//@property(nonatomic) AppDelegate *delegate;
//监听蓝牙并发送命令给蓝牙使停止发送数据
delegate=(AppDelegate*)[[UIApplication sharedApplication]delegate];
[delegate Record];
[delegate SendEnd];
利用Appdelegate保证蓝牙在后台运行通讯的方法大概这样，欢迎大家讨论！