iOS 开发中网络连接处理

//显示网络连接状态，即在状态栏上显示一个旋转图标
UIApplication *app = [UIApplication sharedApplication];
app.networkActivityIndicatorVisible = YES;

1. 需要导入需要的框架 SystemConfiguration的框架

2. 使用的头文件，包括所需要的网络处理相关的头文件

#import <sys/socket.h>
#import <netinet/in.h>
#import <arpa/inet.h>
#import <netdb.h>
#import <SystemConfiguration/SCNetworkReachability.h>

3.添加函数

+ (BOOL)connectionIsLink{

    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;
 
    // Recover reachability flags
    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;
 
    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);
 
    if (!didRetrieveFlags)
    {
        NSLog(@"Error. Could not recover network reachability flags");
        return NO;
    }
    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
    return (isReachable && !needsConnection) ? YES : NO;

}