#import "ViewController.h"
#import <CoreBluetooth/CoreBluetooth.h>
#import "NSObject+GetWeidth.h"

#define NAME @"YUNMAI-SIGNAL-CW"

@interface ViewController ()<CBCentralManagerDelegate,CBPeripheralDelegate,UITableViewDelegate,UITableViewDataSource>

//主设管理中心，需要且必须是单例
@property (nonatomic, strong) CBCentralManager *centralManager;//中心管理者
@property (nonatomic, retain) NSMutableArray *peripheralList;//外设列表
@property (nonatomic, strong) CBPeripheral *peripheral;

@property (strong, nonatomic) IBOutlet UITableView *showFindDevicesView;

@property (strong, nonatomic) IBOutlet UITextView *showReadDataView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.showFindDevicesView.delegate = self;
    self.showFindDevicesView.dataSource = self;
}

//MARK:------视图--------
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return self.peripheralList.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *cellID = @"id";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
    }
    
    CBPeripheral *peripheral = self.peripheralList[indexPath.row];
    cell.textLabel.text = peripheral.name==nil?@"匿名设备":peripheral.name;
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    CBPeripheral *peripheral = self.peripheralList[indexPath.row];
    self.peripheral = peripheral;
    [self.centralManager cancelPeripheralConnection:self.peripheral];
    [self.centralManager connectPeripheral:self.peripheral options:nil];
}

- (void)alertViewWithMessage:(NSString *)message{
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"连接状态" message:message preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *act = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        [self dismissViewControllerAnimated:YES completion:nil];
    }];
    [alert addAction:act];
    [self presentViewController:alert animated:YES completion:nil];
}

//MARK:------功能--------
- (IBAction)searDevices:(id)sender {

    [self.centralManager scanForPeripheralsWithServices:nil options:@{CBCentralManagerScanOptionAllowDuplicatesKey:@(NO)}];
    
}

//MARK:-------中心管理者的方法--------
- (void)centralManagerDidUpdateState:(CBCentralManager *)central{
    
    NSString *message = nil;
    switch (central.state) {
        case CBCentralManagerStateUnknown: {
            message = @"中心设备 未知状态";
            break;
        }
        case CBCentralManagerStateResetting: {
            message = @"中心设备 重启中";
            break;
        }
        case CBCentralManagerStateUnsupported: {
            message = @"中心设备 不支持";
            break;
        }
        case CBCentralManagerStateUnauthorized: {
            message = @"中心设备 未授权";
            break;
        }
        case CBCentralManagerStatePoweredOff: {
            message = @"中心设备 关闭";
            break;
        }
        case CBCentralManagerStatePoweredOn: {
            message = @"中心设备 开启";
            break;
        }
    }

}

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *, id> *)advertisementData RSSI:(NSNumber *)RSSI{

    [self.peripheralList addObject:peripheral];
    
    if ([peripheral.name isEqualToString:NAME]) {
        [central stopScan];

        dispatch_async(dispatch_get_main_queue(), ^{
            [self.showFindDevicesView reloadData];
        });
    }
}

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{
    
    self.peripheral.delegate = self;
    [self.peripheral discoverServices:nil];
    
    [self alertViewWithMessage:@"设备已连接成功"];
    
}


- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(nullable NSError *)error{
    [self alertViewWithMessage:error.description];
}

- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(nullable NSError *)error{
    
    [self alertViewWithMessage:@"设备已断开"];
}


//MARK:-------外设的代理方法---------
//连接上外设 可以获得所有的服务
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(nullable NSError *)error{
    
    for (CBService *service in peripheral.services) {
//        会去调用 获得特征的代理
        [peripheral discoverCharacteristics:nil forService:service];

    }
    
}
//获得特征的回调
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
    
    for (CBCharacteristic *cha in service.characteristics) {
//        回去调用 获得特征值的代理
        [peripheral readValueForCharacteristic:cha];
        [peripheral setNotifyValue:YES forCharacteristic:cha];
    }

}

//获得特征值
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error{

    
    NSString *content = [NSString stringWithFormat:@"%@",characteristic];
    
    NSLog(@"获得到的数据:%@",characteristic);

    if (content==nil) {
        return;
    }
    content = [content substringWithRange:NSMakeRange(content.length - 7, 4)];
    double curNum = [content getWeidthByHEX:content];;
    
    if (self.memoryNum == [content getWeidthByHEX:content] && self.memoryNum >0) {
       
            __weak ViewController *weakVC = self;
            dispatch_async(dispatch_get_main_queue(), ^{
                
                self.showReadDataView.text = [NSString stringWithFormat:@"您现在体重:\n%0.2f斤",weakVC.memoryNum*2];
            });
        
    }
    self.memoryNum = curNum;
}


//MARK:-----创建对象-------
- (CBCentralManager *)centralManager{
    if (!_centralManager) {
        dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
        _centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:queue];
    }
    return _centralManager;
}

- (NSMutableArray *)peripheralList{
    if (!_peripheralList) {
        _peripheralList = [NSMutableArray array];
    }
    return _peripheralList;
}

在.h文件中

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (nonatomic, assign) double memoryNum;
@end

#import "NSObject+GetWeidth.h"

@implementation NSObject (GetWeidth)

- (double)getWeidthByHEX:(NSString *)dataString{
    
    double weidth = 0;
    dataString = [dataString lowercaseString];
    
    NSDictionary *returnNumDic = @{@"1":@1,@"2":@2,@"3":@3,@"4":@4,@"5":@5,@"6":@6,@"7":@7,@"8":@8,@"9":@9,@"a":@10,@"b":@11,@"c":@12,@"d":@13,@"e":@14,@"f":@15};
    
    for (int i = 0; i < dataString.length ; i++) {
        NSString *num = [dataString substringWithRange:NSMakeRange(i, 1)];
        
        int index = [returnNumDic[num] intValue];
       
        switch (i) {
            case 0:
                weidth = weidth + index * 16*16*16;
                break;
            case 1:
                weidth = weidth + index * 16*16;
                break;
            case 2:
                weidth = weidth + index * 16;
                break;
            case 3:
                weidth = weidth + index;
                break;
            default:
                break;
        }
   
    }
    
    return weidth/100.0f;
}

@end

import <Foundation/Foundation.h>

@interface NSObject (GetWeidth)

• (double)getWeidthByHEX:(NSString *)dataString;

@end