IOS判斷app在appstore是否有可用的更新

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iTunes可以提供app的版本資訊，主要通過appid擷取，如 http://itunes.apple.com/lookup?id=946449501，使用時只需要到iTunes尋找自己的appid，修改成自己的appid即可

使用HTTP模式讀取此連結可以擷取app資訊的json字串

貼出部分代碼

-(void)checkVersion{    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:strURL]];//strURL為你的appid地址    [request setRequestMethod:@"POST"];    [request setDelegate:self];    [request startAsynchronous];}-(void)requestFinished:(ASIHTTPRequest *)request{    NSString *recStr = [[NSString alloc] initWithData:request.responseData encoding:NSUTF8StringEncoding];    recStr = [recStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];//返回的字串有前面有很多分行符號，需要去除一下    NSDictionary *resultDic = [JSONHelper DeserializerDictionary:recStr];//jsonhelper是我封裝的json解析類，你可以使用自己方式解析        NSArray *infoArray = [resultDic objectForKey:@"results"];    if (infoArray.count > 0) {                NSDictionary* releaseInfo =[infoArray objectAtIndex:0];        NSString* appStoreVersion = [releaseInfo objectForKey:@"version"];        NSDictionary *infoDic = [[NSBundle mainBundle] infoDictionary];        NSString *currentVersion = [infoDic objectForKey:@"CFBundleShortVersionString"];                NSArray *curVerArr = [currentVersion componentsSeparatedByString:@"."];        NSArray *appstoreVerArr = [appStoreVersion componentsSeparatedByString:@"."];        BOOL needUpdate = NO;        //比較版本號碼大小        int maxv = (int)MAX(curVerArr.count, appstoreVerArr.count);        int cver = 0;        int aver = 0;        for (int i = 0; i < maxv; i++) {            if (appstoreVerArr.count > i) {                aver = [NSString stringWithFormat:@"%@",appstoreVerArr[i]].intValue;            }            else{                aver = 0;            }            if (curVerArr.count > i) {                cver = [NSString stringWithFormat:@"%@",curVerArr[i]].intValue;            }            else{                cver = 0;            }            if (aver > cver) {                needUpdate = YES;                break;            }        }                //如果有可用的更新        if (needUpdate){                        trackViewURL = [[NSString alloc] initWithString:[releaseInfo objectForKey:@"trackViewUrl"]];//trackViewURL臨時變數儲存app，可以讓app跳轉到appstore            UIAlertView* alertview =[[UIAlertView alloc] initWithTitle:@"版本升級" message:[NSString stringWithFormat:@"發現有新版本，是否升級？"] delegate:self cancelButtonTitle:@"暫不升級" otherButtonTitles:@"馬上升級", nil];            [alertview show];                    }            }}- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    if (buttonIndex == 1){        UIApplication *application = [UIApplication sharedApplication];        [application openURL:[NSURL URLWithString:trackViewURL]];    }}

 

IOS判斷app在appstore是否有可用的更新