iOS判断用户是否挂代理

+ (BOOL)isNetworkDelegateState {
    NSURL* URL = [[NSURL alloc] initWithString:@"https://m.aliyun.com"];
    NSDictionary *proxySettings = CFBridgingRelease(CFNetworkCopySystemProxySettings());
    NSArray *proxies = nil;
    proxies = CFBridgingRelease(CFNetworkCopyProxiesForURL((__bridge CFURLRef)URL,
                                                           (__bridge CFDictionaryRef)proxySettings));
    if (proxies.count) {
        NSDictionary *settings = [proxies objectAtIndex:0];
        NSString* host = [settings objectForKey:(NSString *)kCFProxyHostNameKey];
        NSNumber* port = [settings objectForKey:(NSString *)kCFProxyPortNumberKey];
        if (host && port) {
            return YES;
        }
    }
    return NO;
}
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