IOS檢測版本更新(***為app id)

[cpp]  -(void)GetUpdate  {      NSDictionary *infoDict = [[NSBundle mainBundle] infoDictionary];      NSString *nowVersion = [infoDict objectForKey:@"CFBundleVersion"];            NSURL *url = [NSURL URLWithString:@"http://itunes.apple.com/lookup?id=***"];      NSString * file =  [NSString stringWithContentsOfURL:url];      NSLog(file);     //"version":"1.0"      NSRange substr = [file rangeOfString:@"\"version\":\""];      NSRange substr2 =[file rangeOfString:@"\"" options:NULL range:NSRange{substr.location+substr.length,10}];      NSRange range = {substr.location+substr.length,substr2.location-substr.location-substr.length};      NSString *newVersion =[file substringWithRange:range];      if([nowVersion isEqualToString:newVersion]==NO)      {          UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:@"版本有更新" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"更新", nil];          [alert show];  www.2cto.com    }        }  - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex  {     if(buttonIndex==1)     {         NSURL *url = [NSURL URLWithString:@"https://itunes.apple.com/us/app/qun-xiang-dao/id***?ls=1&mt=8"];         [[UIApplication sharedApplication]openURL:url];      }  }