esp32与ios 手机连接同一个wifi时如何使用GCDAsyncSocket接收esp32发送的数据，请提供示例代码

以下是使用GCDAsyncSocket接收esp32发送的数据的示例代码：

1. 首先需要导入GCDAsyncSocket库

#import "GCDAsyncSocket.h"

2. 创建一个GCDAsyncSocket实例，并设置代理

GCDAsyncSocket *socket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];

3. 在连接到esp32时，调用connectToHost方法

NSError *error = nil;
if (![socket connectToHost:host onPort:port error:&error]) {
    NSLog(@"Error connecting: %@", error);
}

其中，host为esp32的IP地址，port为esp32服务器开放的端口号。

4. 实现GCDAsyncSocketDelegate中的方法，处理接收到的数据

- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
    // 处理接收到的数据
    NSString *receivedData = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"Received data: %@", receivedData);
    
    // 继续监听数据
    [sock readDataWithTimeout:-1 tag:0];
}

在didReadData方法中，可以处理接收到的数据。然后，通过调用readDataWithTimeout方法，继续监听数据。

完整示例代码如下：

#import "ViewController.h"
#import "GCDAsyncSocket.h"

@interface ViewController () <GCDAsyncSocketDelegate>

@property (nonatomic, strong) GCDAsyncSocket *socket;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 创建socket实例
    self.socket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];
    
    // 连接esp32
    NSString *host = @"esp32的IP地址";
    uint16_t port = 8080;
    NSError *error = nil;
    if (![self.socket connectToHost:host onPort:port error:&error]) {
        NSLog(@"Error connecting: %@", error);
    }
}

#pragma mark - GCDAsyncSocketDelegate

- (void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port {
    NSLog(@"Connected to host %@:%d", host, port);
    
    // 开始监听数据
    [sock readDataWithTimeout:-1 tag:0];
}

- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
    // 处理接收到的数据
    NSString *receivedData = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"Received data: %@", receivedData);
    
    // 继续监听数据
    [sock readDataWithTimeout:-1 tag:0];
}

- (void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err {
    NSLog(@"Disconnected from host");
}

@end

注意，以上代码中的host和port需要替换成实际的esp32的IP地址和端口号。