检查 iOS 上的互联网连接会引发错误

Posted 2023-02-23

【中文标题】检查 iOS 上的互联网连接会引发错误

【英文标题】：Checking internet connection on iOS throws error

【发布时间】：2015-01-23 19:20:00

【问题描述】：

我在我的应用程序中实现了Reachability 来检查互联网连接。问题是当我调用函数Reachability.isConnectedToNetwork() 时，它会在if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == 0 这一行抛出错误EXC_BAD_ACCESS

我怀疑问题出在SCNetworkReachabilityGetFlags 或withUnsafePointer(&zeroAddress)，但无法调试到底是什么问题。

编辑

下面是我试过的代码...

public class Reachability

    public class func isConnectedToNetwork() -> Bool 

        var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
        zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)

        let defaultRouteReachability = withUnsafePointer(&zeroAddress) 
            SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)).takeRetainedValue()
        

        var flags: SCNetworkReachabilityFlags = 0
        if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == 0 
            return false
        

        let isReachable = (flags & UInt32(kSCNetworkFlagsReachable)) != 0
        let needsConnection = (flags & UInt32(kSCNetworkFlagsConnectionRequired)) != 0

        return (isReachable && !needsConnection) ? true : false
    

【问题讨论】：

如果您发布代码围绕您使用Reachability，它可能会帮助我们解决您的问题

@David 我已经用我尝试过的代码更新了我的帖子。

【参考方案1】：

试试这样简单的：

#import "Reachability.h"

- (BOOL)connected

    Reachability *reachability = [Reachability reachabilityForInternetConnection];
    NetworkStatus networkStatus = [reachability currentReachabilityStatus];
    return networkStatus != NotReachable;