修改Reachability检测2g、3g、4g网络

1.在networkStatusForFlags:方法里面找到以下地方，替换即可。

 1     if (flags & kSCNetworkReachabilityFlagsIsWWAN) {
 2         if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {
 3             CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];
 4             NSString *currentRadioAccessTechnology = info.currentRadioAccessTechnology;
 5             if (currentRadioAccessTechnology) {
 6                 if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE]) {
 7                     return kReachableVia4G;
 8                 } else if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS]) {
 9                     return kReachableVia2G;
10                 } else {
11                     return kReachableVia3G;
12                 }
13             }
14         }
15         
16         if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection) {
17             if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired) {
18                 return kReachableVia2G;
19             }
20             return kReachableVia3G;
21         }
22         return kReachableViaWWAN;
23     }

2.iOS高级教程2:反射根据变量的引用获取变量名

 1 - (NSString *)nameWithInstance:(id)instance {
 2     unsigned int ivarCount = 0;// 成员变量的数量
 3     Ivar *ivars = class_copyIvarList([self class], &ivarCount);// 获取这个类的 成员变量
 4     NSString *key = nil;
 5     for (int i=0; i<ivarCount; i++) {
 6         Ivar thisIvar = ivars[i];
 7         // 获取变量的类型，判断是否是对象
 8         NSString *type = [NSString stringWithUTF8String:ivar_getTypeEncoding(thisIvar)];
 9         if (![type hasPrefix:@"@"]) {
10             continue;
11         }
12         if (object_getIvar(self, thisIvar) == instance) {// 获取实例对象的成员变量与传入实例对象的成员变量比较
13             key = [NSString stringWithUTF8String:ivar_getName(thisIvar)];// 取得实例对象的成员变量名称
14             break;
15         }
16     }
17     free(ivars);
18     return key;
19 }
20 
21 #define varName(var) [NSString stringWithFormat:@"%s", #var]
22 NSString *abc = varName(abc);
23 NSLog(@"%@", abc);

时常一个人发呆，看到宁静的天空。