ios - SimplePing Apple 代表不解雇

Question

以下问题:

我实现了一个 Ping 对象:

@interface PingTest : NSObject <SimplePingDelegate>
@property (strong, nonatomic) SimplePing* ping;

我从 Apple 获得的 SimplePing:https://developer.apple.com/library/mac/samplecode/SimplePing/Introduction/Intro.html

现在我正尝试发送这样的 Ping:

@synthesize ping;

ping = [SimplePing simplePingWithHostName:PING_SERVER];
ping.delegate = self;
[ping start];

#pragma mark - SimplePingDelegates

- (void)simplePing:(SimplePing *)pinger didStartWithAddress:(NSData *)address {
}

- (void)simplePing:(SimplePing *)pinger didSendPacket:(NSData *)packet
{
NSLog(@"didSendPacket");
}

- (void)simplePing:(SimplePing *)pinger didFailToSendPacket:(NSData *)packet error:(NSError *)error
{
NSLog(@"didFailToSendPacket");
}

- (void)simplePing:(SimplePing *)pinger didReceivePingResponsePacket:(NSData *)packet
{
NSLog(@"didReceivePingResponsePacket");
}

但是我的委托(delegate)方法没有被调用...有人知道为什么吗？!

编辑:出于某种原因在 SimplePing.m 中:

- (void)start
// See comment in header.
{
// If the user supplied us with an address, just start pinging that.  Otherwise
// start a host resolution.

if (self->_hostAddress != nil) {
    [self startWithHostAddress];
} else {
    Boolean             success;
    CFHostClientContext context = {0, (__bridge void *)(self), NULL, NULL, NULL};
    CFStreamError       streamError;

    assert(self->_host == NULL);

    self->_host = CFHostCreateWithName(NULL, (__bridge CFStringRef) self.hostName);
    assert(self->_host != NULL);

    CFHostSetClient(self->_host, HostResolveCallback, &context);

    CFHostScheduleWithRunLoop(self->_host, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);

    NSLog(@">CFHostStartInfoResolution");
    success = CFHostStartInfoResolution(self->_host, kCFHostAddresses, &streamError);
    NSLog(@"<CFHostStartInfoResolution");
    if ( ! success ) {
        [self didFailWithHostStreamError:streamError];
    }
}
}

“HostResolveCallback”永远不会被调用....这就是我认为的问题...

Answer 1

ARC 正在释放 SimplePing 实例(在您的情况下为 *ping)，而不是使用属性，而是像这样使用 iVar您还忘记将 sendPingWithData 添加到 didStartWithAddress 委托(delegate)方法。看看

@implementation PingTest
{
    /*CHANGED*/
    SimplePing *_pinger;
}

- (void) startPinger
{
    /*CHANGED*/
    ping = [SimplePing simplePingWithHostName:PING_SERVER];
    ping.delegate = self;
    [ping start];
}


#pragma mark - SimplePingDelegates

- (void)simplePing:(SimplePing *)pinger didStartWithAddress:(NSData *)address 
{
    /*CHANGED*/
    [pinger sendPingWithData:nil];
}

- (void)simplePing:(SimplePing *)pinger didSendPacket:(NSData *)packet
{
    NSLog(@"didSendPacket");
    /*CHANGED*/
    //Capture time here if you want to measure the latency
}

- (void)simplePing:(SimplePing *)pinger didFailToSendPacket:(NSData *)packet error:(NSError *)error
{
    NSLog(@"didFailToSendPacket");
}

- (void)simplePing:(SimplePing *)pinger didReceivePingResponsePacket:(NSData *)packet
{
    NSLog(@"didReceivePingResponsePacket");

    /*CHANGED*/
    //Capturing time here again and comparing it with the one from didSentPacket will 
    // give you the latency
}