iOS应用更新问题

Question

我可以在应用程序设置界面中添加“检查更新”按钮，然后提交到苹果商店。它会被拒绝吗？如果我无法添加按钮来检查更新，是否有其他方法可以检测是否有新的应用程序更新？

Answer 1

是。您可以添加以检查更新是否可用。您也可以知道更新是否可用。首先，您需要从info.plist文件中获取当前的应用程序版本号。稍后你必须从apple itunes获取版本号。现在比较两个更新，如果appstore版本大于当前版本，则显示一个弹出窗口，说明新的更新可用。当用户每次启动应用程序或根据您的要求从任何地方开始时，您可以从AppDelegate完成这一切。

以下是获取版本号的方法：

Swift版本

  func appUpdateAvailable(storeInfoURL: String) -> Bool
    {
        var upgradeAvailable = false

        // Get the main bundle of the app so that we can determine the app's version number
        let bundle = NSBundle.mainBundle()
        if let infoDictionary = bundle.infoDictionary {
            // The URL for this app on the iTunes store uses the Apple ID for the  This never changes, so it is a constant
            let urlOnAppStore = NSURL(string: storeInfoURL)
            if let dataInJSON = NSData(contentsOfURL: urlOnAppStore!) {
                // Try to deserialize the JSON that we got
                if let lookupResults = try? NSJSONSerialization.JSONObjectWithData(dataInJSON, options: NSJSONReadingOptions()) {
                    // Determine how many results we got. There should be exactly one, but will be zero if the URL was wrong
                    if let resultCount = lookupResults["resultCount"] as? Int {
                        if resultCount == 1 {
                            // Get the version number of the version in the App Store
                            if let appStoreVersion = lookupResults["results"]!![0]["version"] as? String {
                                // Get the version number of the current version
                                if let currentVersion = infoDictionary["CFBundleShortVersionString"] as? String {
                                    // Check if they are the same. If not, an upgrade is available.
                                    if appStoreVersion != currentVersion {
                                        upgradeAvailable = true                      
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

        return upgradeAvailable
    }

<强>目标C

 -(BOOL) needsUpdate{
    NSDictionary* infoDictionary = [[NSBundle mainBundle] infoDictionary];
    NSString* appID = infoDictionary[@"CFBundleIdentifier"];
    NSURL* url = [NSURL URLWithString:[NSString stringWithFormat:@"http://itunes.apple.com/lookup?bundleId=%@", appID]];
    NSData* data = [NSData dataWithContentsOfURL:url];
    NSDictionary* lookup = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

    if ([lookup[@"resultCount"] integerValue] == 1){
        NSString* appStoreVersion = lookup[@"results"][0][@"version"];
        NSString* currentVersion = infoDictionary[@"CFBundleShortVersionString"];
        if (![appStoreVersion isEqualToString:currentVersion]){
            NSLog(@"Need to update [%@ != %@]", appStoreVersion, currentVersion);
            return YES;
            }
        }
        return NO;
    }