运行最新版本时没有“最新”消息吗？

Question

我正在尝试将Sparkle与Qt（binding for Go）应用一起使用。

sparkle.m：

#import <Headers/SUUpdater.h>

static SUUpdater* updater = nil;

void sparkle_checkUpdates()
{
    if (!updater) {
        updater = [[SUUpdater sharedUpdater] retain];
    }

    [updater setUpdateCheckInterval:3600];
    [updater checkForUpdatesInBackground];
}

sparke.go：

// +build darwin windows

package main

/*
#cgo CFLAGS: -I ${SRCDIR}/Sparkle.framework
#cgo LDFLAGS: -F ${SRCDIR} -framework Sparkle

void sparkle_checkUpdates();
*/
import "C"

func sparkle_checkUpdates() {
    C.sparkle_checkUpdates()
}

在main.go中，我添加了一个菜单来调用该函数：

package main

import (
    "github.com/therecipe/qt/widgets"
)

func main() {
    action := widgets.NewQMenuBar(nil).AddMenu2("").AddAction("Check for Updates...")
    // http://doc.qt.io/qt-5/qaction.html#MenuRole-enum
    action.SetMenuRole(widgets.QAction__ApplicationSpecificRole)
    action.ConnectTriggered(func(bool) { sparkle_checkUpdates() })
}

有更新时，它工作正常：下载，解压缩，安装，重新启动，... 但是，当运行最新版本时，单击“检查更新...”菜单，则什么也没有发生。没有弹出窗口表示我们是最新的，类似这样： 在控制台中，我只会看到以下内容：

[3 <private> stream, pid: 90977, url: https://example.com/appcast.xml, traffic class: 200, tls] cancelled
    [3.1 70A1F65B-7E7A-4ED2-AB8B-A21621ED7658 <private>.58040<-><private>]
    Connected Path: satisfied (Path is satisfied), interface: en0, ipv4, dns
    Duration: 0.497s, DNS @0.000s took 0.001s, TCP @0.003s took 0.051s, TLS took 0.113s
    bytes in/out: 4481/675, packets in/out: 6/3, rtt: 0.053s, retransmitted packets: 0, out-of-order packets: 0

appcast.xml：

<?xml version="1.0" standalone="yes"?>
<rss xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle" version="2.0">
  <channel>
    <title>Premium VPN</title>
    <item>
      <title>1.0.0.2905</title>
      <pubDate>Tue, 11 Dec 2018 11:09:10 +0800</pubDate>
      <sparkle:minimumSystemVersion>10.7</sparkle:minimumSystemVersion>
      <enclosure url="https://example.com/x.zip" sparkle:version="1.0.0.2905" sparkle:shortVersionString="1.0.0.2905" sparkle:edSignature="x" length="104408678" type="application/octet-stream"/>
    </item>
  </channel>
</rss>

Info.plist：

    <key>SUFeedURL</key>
    <string>https://example.com/appcast.xml</string>
    <key>SUPublicEDKey</key>
    <string>x</string>

我错过了什么吗？

Answer 1

仔细查看checkForUpdatesInBackground：

/*!
 Checks for updates, but does not display any UI unless an update is found.

 This is meant for programmatically initating a check for updates. That is,
 it will display no UI unless it actually finds an update, in which case it
 proceeds as usual.

 If automatic downloading of updates it turned on and allowed, however,
 this will invoke that behavior, and if an update is found, it will be downloaded
 in the background silently and will be prepped for installation.

 This will not find updates that the user has opted into skipping.
 */
- (void)checkForUpdatesInBackground;

因此，使用此方法，只有找到更新后，才会显示UI。

我想要的是checkForUpdates：

/*!
 Explicitly checks for updates and displays a progress dialog while doing so.

 This method is meant for a main menu item.
 Connect any menu item to this action in Interface Builder,
 and Sparkle will check for updates and report back its findings verbosely
 when it is invoked.

 This will find updates that the user has opted into skipping.
 */
 - (IBAction)checkForUpdates:(id)sender;