ios5之前可以通过读取配置文件获取，ios5以后苹果修改wifi列表文件位置，只有root权限才可以读取.
ios4:/System/Library/SystemConfiguration/WiFiManager.bundle/WiFiManager
ios5:/System/Library/SystemConfiguration/IPConfiguration.bundle/IPConfiguration
官方的API没有提供获取扫描所有wifi列表，相近功能的只有CaptiveNetwork，获取当前wifi的名称。
引用头文件<SystemConfiguration/CaptiveNetwork.h>
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/*! @function CNCopySupportedInterfaces @discussion copies a list of all interfaces CaptiveNetworkSupport is monitoring. @result An array of CFStringRef- BSD interface names. Returns NULL if an error was encountered. You MUST release the returned value. */CFArrayRefCNCopySupportedInterfaces (void) __OSX_AVAILABLE_STARTING(__MAC_10_8,__IPHONE_4_1); |
通过CNCopySupportedInterfaces获取wifi列表，实际测试中返回数组中只有一个值，即当前连接的wifi。
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- (NSString
*)currentWifiSSID { NSString
*ssid = nil; NSArray
*ifs = (__bridge id)CNCopySupportedInterfaces(); for
(NSString
*ifname in ifs) { NSDictionary
*info = (__bridge id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifname); if
(info[@"SSIDD"]) { ssid = info[@"SSID"]; } } return
ssid;} |
原文：http://www.cnblogs.com/geweb/p/CaptiveNetwork.html