我想检查一下我是否可以在iOS上使用Cocoa Touch库或在macOS上使用Cocoa库连接互联网。
我想出了一个方法来做这个使用NSURL。我的方法似乎有点不可靠(因为即使谷歌也可能有一天宕机，依赖第三方似乎很糟糕)，虽然如果谷歌没有响应，我可以检查其他一些网站的响应，但这似乎是浪费和不必要的应用程序开销。
- (BOOL)connectedToInternet {
NSString *URLString = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.google.com"]];
return ( URLString != NULL ) ? YES : NO;
}
是我做得不好，(更不用说stringWithContentsOfURL已弃用在iOS 3.0和macOS 10.4)，如果是这样，有什么更好的方法来实现这一点?
当前回答
很简单的…试试下面这些步骤:
步骤1:将SystemConfiguration框架添加到项目中。
步骤2:将以下代码导入到头文件中。
#import <SystemConfiguration/SystemConfiguration.h>
第三步:使用以下方法
类型1: - (BOOL) currentNetworkStatus { [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; BOOL连接; BOOL与; Const char *host = "www.apple.com"; SCNetworkReachabilityRef reachabilityreachabilitycreatewithname (NULL, host); SCNetworkReachabilityFlags旗帜; connected = SCNetworkReachabilityGetFlags(可达性，&flags); isConnected = NO; isConnected = connected && (flags & kSCNetworkFlagsReachable) && !(flags & kSCNetworkFlagsConnectionRequired); CFRelease(可达性); 返回与; ｝
类型2: 导入头文件:# Import "Reachability.h" (保龄球)currentNetworkStatus ｛ 可达性*可达性=[互联网连接的可达性]; NetworkStatus NetworkStatus =[可达性currentReachabilityStatus]; 返回networkStatus !=不可访问; ｝
第四步:使用方法:
- (void)CheckInternet
{
BOOL network = [self currentNetworkStatus];
if (network)
{
NSLog(@"Network Available");
}
else
{
NSLog(@"No Network Available");
}
}
其他回答
进口“Reachability.h”
-(BOOL)netStat
{
Reachability *test = [Reachability reachabilityForInternetConnection];
return [test isReachable];
}
在ViewController中导入Reachable.h类，并使用以下代码检查连通性:
#define hasInternetConnection [[Reachability reachabilityForInternetConnection] isReachable]
if (hasInternetConnection){
// To-do block
}
//
// Connectivity.swift
//
//
// Created by Kausik Jati on 17/07/20.
//
//
import Foundation
import Network
enum ConnectionState: String {
case notConnected = "Internet connection not avalable"
case connected = "Internet connection avalable"
case slowConnection = "Internet connection poor"
}
protocol ConnectivityDelegate: class {
func checkInternetConnection(_ state: ConnectionState, isLowDataMode: Bool)
}
class Connectivity: NSObject {
private let monitor = NWPathMonitor()
weak var delegate: ConnectivityDelegate? = nil
private let queue = DispatchQueue.global(qos: .background)
private var isLowDataMode = false
static let instance = Connectivity()
private override init() {
super.init()
monitor.start(queue: queue)
startMonitorNetwork()
}
private func startMonitorNetwork() {
monitor.pathUpdateHandler = { path in
if #available(iOS 13.0, *) {
self.isLowDataMode = path.isConstrained
} else {
// Fallback on earlier versions
self.isLowDataMode = false
}
if path.status == .requiresConnection {
print("requiresConnection")
self.delegate?.checkInternetConnection(.slowConnection, isLowDataMode: self.isLowDataMode)
} else if path.status == .satisfied {
print("satisfied")
self.delegate?.checkInternetConnection(.connected, isLowDataMode: self.isLowDataMode)
} else if path.status == .unsatisfied {
print("unsatisfied")
self.delegate?.checkInternetConnection(.notConnected, isLowDataMode: self.isLowDataMode)
}
}
}
func stopMonitorNetwork() {
monitor.cancel()
}
}
苹果提供了一个示例应用程序，它正是这样做的:
可达性
我认为这是最好的答案。
“是”意味着有联系。“No”表示断开连接。
#import "Reachability.h"
- (BOOL)canAccessInternet
{
Reachability *IsReachable = [Reachability reachabilityForInternetConnection];
NetworkStatus internetStats = [IsReachable currentReachabilityStatus];
if (internetStats == NotReachable)
{
return NO;
}
else
{
return YES;
}
}
