iOS检测版本更新

有时候为了需求，我们需要检测app版本更新今天在这里整合下

／／获取当前版本号

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

    CFShow((__bridge CFTypeRef)(infoDictionary));

    

    NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];

    ／／获取苹果商店的版本号

    NSError  *error;

    NSString * urlStr = [NSString stringWithFormat:@"http://itunes.apple.com/lookup?id=你要检测的app版本"];

    NSURL * url =[NSURL URLWithString:urlStr];

    NSURLRequest * request =[NSURLRequest requestWithURL:url];

    NSData * response =[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

    NSDictionary * appInfo =[NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];

    if (error) {

        NSLog(@"error:%@",[error description]);

    }

    NSArray *resultsArray =[appInfo objectForKey:@"results"];

    if (![resultsArray count]) {

        NSLog( @"error: nil");

        return self;

    }

    NSDictionary * infoDic =[resultsArray objectAtIndex:0];

    NSString * appVersion = [infoDic objectForKey:@"version"];

   appUrl =[infoDic objectForKey:@"trackViewUrl"];

    double doucurrV =[app_Version doubleValue];

    double  douappV= [appVersion doubleValue];

    ／／判断版本号对比

    if (doucurrV < douappV) {

        NSString * titleStr =[NSString stringWithFormat:@"检查更新"];

        NSString * message =[NSString stringWithFormat:@"发现新版本，是否更新？"];

        UIAlertView * alert = [[UIAlertView alloc]initWithTitle:titleStr message:message delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];

        

        alert.tag = 1001;

        [alert show];

                              

    }else

    {

        

        UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"检测更新" message:@"无更新版本"delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];

        

        alert.tag = 1002;

        [alert show];

 

        

        

    }

   ／／跳转更新 

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

{

    

    if (alertView.tag ==1001) {

        if (buttonIndex == 1) {

            [[UIApplication sharedApplication]openURL:[NSURL URLWithString: appUrl]];

        }

    }

    

}