检测WIfi是否打开
引入SystemConfiguration库并添加头文件：#import <SystemConfiguration/SystemConfiguration.h>
代码如下：
NSArray *ifs = (__bridgeid)CNCopySupportedInterfaces();
for (NSString *ifnam in ifs) {
NSDictionary *info = (__bridgeid)CNCopyCurrentNetworkInfo((__bridgeCFStringRef)ifnam);
//info 保存了所有wifi联网的信息
if ( == nil) {
//wifi关闭了
}
}
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