简单的库，用于访问 Mac OS 系统代理设置

AHProxySettings  *settings = [[AHProxySettings alloc] init];

NSLog(@"%@",settings.HTTPProxy.exportString);
NSLog(@"%@",settings.HTTPSProxy.exportString);
NSLog(@"%@",settings.FTProxy.exportString);
NSLog(@"%@",settings.SOCKSProxy.exportString);
NSLog(@"%@",settings.autoDetectedProxies);

// By default HTTP(S) and FTP proxy objects will be 
// populated with a proxy returned from a .PAC / WPAD request.
// To disable this behavior

settings.useAutoDetectAsFailover = NO;

但是启动此项目的目的是将系统代理值放入 NSTask 中，因此还有一个类别。

#import "NSTask+useSystemProxies.h"

NSTask *task = [NSTask alloc] init];
task.launchPath = @"/usr/bin/curl"
task.arguments = @[ @"-k", _testURL.stringValue ];

[task useSystemProxies];
// This is equivalent to 
// export HTTP_PROXY = ...
// export HTTPS_PROXY = ...
// export FTP_PROXY = ...
// export NO_PROXY = ...
// based on your system settings

// or to dynamically determine if a proxy 
// is needed based on a PAC file
[task useSystemProxiesForDestination:@"github.com"];

[task launch];

// ... then do what you will with the results ... //

如果不在 CocoaPods 中使用，请确保在构建设置的其它链接器标志中包含 -ObjC，以便类别不会被优化掉。