Check if iPhone is connected to the internet [duplicate]

问题

how I can check quickly if the iPhone is connected to internet or not, quickly...

Thanks...

回答1:

Have a look at Apple's Reachability class and this example app.

回答2:

You should try to connect to the server with what you think is an appropriate timeout. NEVER use the reachability API until you've determined that your connection attempt failed and even then only if the error you receive from NSURLConnection et. al. is one that suggests you're not connected to the network. In that case, use the Reachability API to determine when you should try again.

Merely attempting a connection may bring up a network interface that wasn't available before.

回答3:

You can check for internet connection in swift using code below:

import SystemConfiguration

class Reachability: NSObject {

class func isConnectedToNetwork() -> Bool {
    var zeroAddress = sockaddr_in()
    zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
    zeroAddress.sin_family = sa_family_t(AF_INET)
    let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
        SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
    }
    var flags = SCNetworkReachabilityFlags()
    if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
        return false
    }
    let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
    let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
    return (isReachable && !needsConnection)
}

Hope this helps!!

来源：https://stackoverflow.com/questions/6129219/check-if-iphone-is-connected-to-the-internet

标签

iphone

objective-c

ios

reachability