请求应用信息

iOS开发中通过 http://itunes.apple.com/lookup?id=app ID 请求应用信息 ,如果你选择了仅限中国地区销售,请使用 http://itunes.apple.com/cn/lookup?id==app ID        

  /cn代表中国,如果不带,版本号为0 ,内容为空,

另判断当前是否需要更新代码:

 NSURL *appUrl = [NSURL URLWithString:[NSString stringWithFormat:@"http://itunes.apple.com/cn/lookup?id=%@",appId]];

    NSString *appMsg = [NSString stringWithContentsOfURL:appUrl encoding:NSUTF8StringEncoding error:nil];

    NSDictionary*appMsgDict = [selfjsonStringToDictionary:appMsg];

    NSDictionary*appResultsDict = [appMsgDict[@"results"]lastObject];

    NSString*appStoreVersion = appResultsDict[@"version"];

    floatnewVersionFloat = [appStoreVersionfloatValue];//新发布的版本号

    NSString *currentVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];

    floatcurrentVersionFloat = [currentVersionfloatValue];//使用中的版本号

    //当前版本小于App Store上的版本&用户未点击不再提示

    if(currentVersionFloat

    {

}

- (BOOL)isAlertUpdataAgain

{//判断条件,是否选择了不再提示

    BOOL res = [[NSUserDefaults standardUserDefaults] objectForKey:@"IS_ALERT_AGAIN"];

    returnres;

}