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]];

}

}

}