iOS12 获取wifi信息

前言：更新了iOS12系统后，发现获取不到已连接wifi的ssid信息，12系统以前手机可以获取，搜集了一翻资料得到答案

1、在Capabilities中，激活Access WiFi Infomation项

屏幕快照 2018-10-11 下午5.47.15.png

2、去开发者账号appid打开Access WiFi Infomation权限

获取代码

屏幕快照 2018-10-11 下午5.54.27.png

//导入SystemConfiguration.framework框架
#import <SystemConfiguration/CaptiveNetwork.h>
+(NSString *)fetchSSIDInfo
{
    NSString *currentSSID = @"Not Found";
    CFArrayRef myArray = CNCopySupportedInterfaces();
    if (myArray != nil){
        NSDictionary* myDict = (__bridge NSDictionary *) CNCopyCurrentNetworkInfo(CFArrayGetValueAtIndex(myArray, 0));
        if (myDict!=nil){
            currentSSID=[myDict valueForKey:@"SSID"];
        } else {
            currentSSID=@"<<NONE>>";
        }
    } else {
        currentSSID=@"<<NONE>>";
    }
    CFRelease(myArray);
    return currentSSID;
}