iOS11网络类型判断（iPhoneX获取网络类型闪退）

简介：

    在之前的项目中，很多是使用导航栏中视图层，通过KVC来获取网络状态，感觉这个方法有些投机取巧，到了iOS11，iPhoneX的导航栏视图层也进行了修改，除了蛋疼的UI，在获取使用以前获取网络状态的方法时候，果然炸了-_-

解决方案：

可以使用Reachability 的方案来解决该问题，GitHub地址，也可以去CSDN资源页下载。

OC代码：

#import <Foundation/Foundation.h>
#import <SystemConfiguration/SystemConfiguration.h>

//! Project version number for MacOSReachability.
FOUNDATION_EXPORT double ReachabilityVersionNumber;

//! Project version string for MacOSReachability.
FOUNDATION_EXPORT const unsigned char ReachabilityVersionString[];

/** 
 * Create NS_ENUM macro if it does not exist on the targeted version of iOS or OS X.
 *
 * @see http://nshipster.com/ns_enum-ns_options/
 **/
#ifndef NS_ENUM
#define NS_ENUM(_type, _name) enum _name : _type _name; enum _name : _type
#endif

extern NSString *const kReachabilityChangedNotification;

typedef NS_ENUM(NSInteger, NetworkStatus) {
    // Apple NetworkStatus Compatible Names.
    NotReachable = 0,
    ReachableViaWiFi = 2,
    ReachableViaWWAN = 1
};

@class Reachability;

typedef void (^NetworkReachable)(Reachability * reachability);
typedef void (^NetworkUnreachable)(Reachability * reachability);
typedef void (^NetworkReachability)(Reachability * reachability, SCNetworkConnectionFlags flags);


@interface Reachability : NSObject

@property (nonatomic, copy) NetworkReachable    reachableBlock;
@property (nonatomic, copy) NetworkUnreachable  unreachableBlock;
@property (nonatomic, copy) NetworkReachability reachabilityBlock;

@property (nonatomic, assign) BOOL reachableOnWWAN;


+(instancetype)reachabilityWithHostname:(NSString*)hostname;
// This is identical to the function above, but is here to maintain
//compatibility with Apples original code. (see .m)
+(instancetype)reachabilityWithHostName:(NSString*)hostname;
+(instancetype)reachabilityForInternetConnection;
+(instancetype)reachabilityWithAddress:(void *)hostAddress;
+(instancetype)reachabilityForLocalWiFi;

-(instancetype)initWithReachabilityRef:(SCNetworkReachabilityRef)ref;

-(BOOL)startNotifier;
-(void)stopNotifier;

-(BOOL)isReachable;
-(BOOL)isReachableViaWWAN;
-(BOOL)isReachableViaWiFi;

// WWAN may be available, but not active until a connection has been established.
// WiFi may require a connection for VPN on Demand.
-(BOOL)isConnectionRequired; // Identical DDG variant.
-(BOOL)connectionRequired; // Apple's routine.
// Dynamic, on demand connection?
-(BOOL)isConnectionOnDemand;
// Is user intervention required?
-(BOOL)isInterventionRequired;

-(NetworkStatus)currentReachabilityStatus;
-(SCNetworkReachabilityFlags)reachabilityFlags;
-(NSString*)currentReachabilityString;
-(NSString*)currentReachabilityFlags;

@end

代码概要：

1.Reachability中，包含了三个枚举类型，分别代表无网络，WiFi网络，数据网络

    NotReachable = 0,

    ReachableViaWiFi = 2,

    ReachableViaWWAN = 1

2.也可以使用

-(BOOL)isReachable;
-(BOOL)isReachableViaWWAN;

-(BOOL)isReachableViaWiFi;

三个方法来获取当前是否支持某种网络类型

使用方式：

1.将Reachability.h和Reachability.m拷贝到工程中，代码中导入Reachability.h

2.获取网络类型代码：

BOOL isExistenceNetwork = YES;
Reachability *reach = [Reachability reachabilityWithHostName:@"www.apple.com"];
switch ([reach currentReachabilityStatus]) {
	case NotReachable:
		isExistenceNetwork = NO;
		NSLog(@"Current Reachability Status : notReachable");
		break;
	case ReachableViaWiFi:
		isExistenceNetwork = YES;
		NSLog(@"Current Reachability Status : WIFI");
		break;
	case ReachableViaWWAN:
		isExistenceNetwork = YES;
		NSLog(@"Current Reachability Status : 3/4G");
		break;
	default:
		break;
}