判断iPhone的WiFi是否打开的两种方法 之是否连接上 WiFi
iOS中用来查询当前连接的网络信息的API即CNCopyCurrentNetworkInfo
这个API位于SystemConfiguration.framework里面,使用时需要增加.h和包含库文件
使用时可以直接包含
#import <SystemConfiguration/CaptiveNetwork.h>
代码如下:
+ (NSString *)getWifiName
{
NSString *wifiName = nil;
CFArrayRef wifiInterfaces = CNCopySupportedInterfaces();
if (!wifiInterfaces) {
return nil;
}
NSArray *interfaces = (__bridge NSArray *)wifiInterfaces;
for (NSString *interfaceName in interfaces) {
CFDictionaryRef dictRef = CNCopyCurrentNetworkInfo((__bridge CFStringRef)(interfaceName));
if (dictRef) {
NSDictionary *networkInfo = (__bridge NSDictionary *)dictRef;
NSLog(@"network info -> %@", networkInfo);
wifiName = [networkInfo objectForKey:(__bridge NSString*)kCNNetworkInfoKeySSID];
CFRelease(dictRef);
}
}
CFRelease(wifiInterfaces);
return wifiName;
}
判断WiFi是否连接可以使用Reachability进行判断,那么WiFi是否打开应该怎么判断呢?
下面是两种完全基于不同思路的方法:
方法一:
使用SystemConfiguration.framework
库进行判断
#import <ifaddrs.h>
#import <net/if.h>
#import <SystemConfiguration/CaptiveNetwork.h>
- (BOOL) isWiFiEnabled {
NSCountedSet * cset = [NSCountedSet new];
struct ifaddrs *interfaces;
if( ! getifaddrs(&interfaces) ) {
for( struct ifaddrs *interface = interfaces; interface; interface = interface->ifa_next)
{
if ( (interface->ifa_flags & IFF_UP) == IFF_UP ) {
[cset addObject:[NSString stringWithUTF8String:interface->ifa_name]];
}
}
}
return [cset countForObject:@"awdl0"] > 1 ? YES : NO;
}
方法二:
使用KVC对StatusBar进行判断
- (BOOL)isWiFiConnected {
UIApplication *app = [UIApplication sharedApplication];
NSArray *children = [[[app valueForKeyPath:@"statusBar"] valueForKeyPath:@"foregroundView"] subviews];
//获得到网络返回码
for (id child in children) {
if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {
int netType = [[child valueForKeyPath:@"dataNetworkType"] intValue];
NSLog(@"type:%@",@(netType));
if (netType == 1) {
NSLog(@"2G");
return NO;
}
else if (netType == 2) {
NSLog(@"3G");
return NO;
}
else if (netType == 3) {
NSLog(@"4G");
return NO;
}
else if (netType == 5){
NSLog(@"Wifi");
return YES;
}
// 1,2,3,5 分别对应的网络状态是2G、3G、4G及WIFI。(需要判断当前网络类型写个switch 判断就OK)
}
}
NSLog(@"not open network or no net work");
return NO;
}
实际上,方法二也是对网络连接状态的判断,不能判断WiFi是否打开。不同的网络连接状态下,StatusBar展示不同的图标,当WiFi打开而没连接时,方法二得到的结果依然会是NO。