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iOS 检测版本更新

2018-07-20 来源：open-open

如果我们要检测app版本的更新，那么我们必须获取当前运行app版本的版本信息和appstore 上发布的最新版本的信息。

当前运行版本信息可以通过info.plist文件中的 version中获取：

NSDictionary *infoDic = [[NSBundle mainBundle] infoDictionary];

NSString *currentVersion = [infoDic objectForKey:@"CFBundleShortVersionString"];

这样就获取到当前运行的app的版本了

具体步骤如下：
1，用 POST 方式发送请求：

http://itunes.apple.com/lookup?id=你的应用程序的ID

#define APP_URL http://itunes.apple.com/lookup?id=你的应用程序的ID

你的应用程序的ID 是 itunes connect里的 Apple ID

NSString *URL = @"http://itunes.apple.com/lookup";

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

[request setURL:[NSURL URLWithString:URL]];

[request setHTTPMethod:@"POST"];

// ? 数据体

NSString *str = [NSString stringWithFormat:@"id=你的应用程序的ID"];

// 将字符串转换成数据

request.HTTPBody = [str dataUsingEncoding:NSUTF8StringEncoding];

NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];

// 开始工作,在很多多线程技术中,start run

dispatch_async(dispatch_queue_create("demo", DISPATCH_QUEUE_CONCURRENT), ^{

[connection start];

});

NSURLConnection 代理中获取数据处理数据－这里不多说了。。

2，从获得的 response 数据中解析需要的数据。因为从 appstore 查询得到的信息是 JSON 格式的，所以需要经过解析。解析之后得到的原始数据就是如下这个样子的：
{
    resultCount = 1;
    results =     (
                {
            artistId = 开发者 ID;
            artistName = 开发者名称;
            price = 0;
            isGameCenterEnabled = 0;
            kind = software;
            languageCodesISO2A =             (
                EN
            );
            trackCensoredName = 审查名称;
            trackContentRating = 评级;
            trackId = 应用程序 ID;
            trackName = 应用程序名称";
            trackViewUrl = 应用程序介绍网址;
            userRatingCount = 用户评级;
            userRatingCountForCurrentVersion = 1;
            version = 版本号;
            wrapperType = software;
      }
    );
}

然后从中取得 results 数组即可，具体代码如下所示：

NSDictionary *jsonData = [dataPayload JSONValue];
NSArray *infoArray = [jsonData objectForKey:@"results"];
NSDictionary *releaseInfo = [infoArray objectAtIndex:0];
NSString *latestVersion = [releaseInfo objectForKey:@"version"];
NSString *trackViewUrl = [releaseInfo objectForKey:@"trackViewUrl"];

如果你拷贝 trackViewUrl 的实际地址，然后在浏览器中打开，就会打开你的应用程序在 appstore 中的介绍页面。当然我们也可以在代码中调用 safari 来打开它。
UIApplication *application = [UIApplication sharedApplication];
[application openURL:[NSURL URLWithString:trackViewUrl]];

代码如下：

-(void)onCheckVersion

{

NSDictionary *infoDic = [[NSBundle mainBundle] infoDictionary];

NSString *currentVersion = [infoDic objectForKey:@"CFBundleVersion"];

NSString *URL = @"http://itunes.apple.com/lookup?id=你的应用程序的ID";

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

[request setURL:[NSURL URLWithString:URL]];

[request setHTTPMethod:@"POST"];

NSHTTPURLResponse *urlResponse = nil;

NSError *error = nil;

NSData *recervedData = [NSURLConnection sendSynchronousRequest:requestreturningResponse:&urlResponse error:&error];

NSString *results = [[NSString alloc] initWithBytes:[recervedData bytes] length:[recervedDatalength] encoding:NSUTF8StringEncoding];

NSDictionary *dic = [results JSONValue];

NSArray *infoArray = [dic objectForKey:@"results"];

if ([infoArray count]) {

NSDictionary *releaseInfo = [infoArray objectAtIndex:];

NSString *lastVersion = [releaseInfo objectForKey:@"version"];

if (![lastVersion isEqualToString:currentVersion]) {

//trackViewURL = [releaseInfo objectForKey:@"trackVireUrl"];

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"更新" message:@"有新的版本更新，是否前往更新？" delegate:self cancelButtonTitle:@"关闭" otherButtonTitles:@"更新", nil];

alert.tag = 10000;

[alert show];

}

else

{

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"更新" message:@"此版本为最新版本"delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

alert.tag = 10001;

[alert show];

}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex

{

if (alertView.tag==10000) {