从plist获取并比较CFBundleVersion

我正在尝试比较CFBundleVersioncom.apple.mobile.installation.plist中2个应用程序的键，其中包括iPhone上每个已安装应用程序的信息

NSString *appBundleID =@"net.someapp.app";
NSString *appBundleID2=@"net.someapp.app2";

NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:
         @"/var/mobile/Library/Caches/com.apple.mobile.installation.plist"];
NSDictionary *User = [dict valueForKey:@"User"];

//get first app version
NSDictionary *bundleID = [User valueForKey:appBundleID];
NSString *appVersion = [bundleID valueForKey:@"CFBundleVersion"];

//get second app version
NSDictionary *bundleID2 = [User valueForKey:appBundleID2];
NSString *appVer2 = [bundleID2 valueForKey:@"CFBundleVersion"];

[dict release];
 
if ([appVersion isEqualToString:appVer2]) {
     NSString *str1=[NSString stringWithFormat:@"Original Version: %@",appVersion];
     NSString *str2=[NSString stringWithFormat:@"2nd Version: %@",appVer2];
     NSString *msg=[NSString stringWithFormat:@"%@\n%@",str1,str2];
     UIAlertView* alertView = [[UIAlertView alloc]
           initWithTitle:@"Same Versions!" message:msg delegate:nil
       cancelButtonTitle:@"Ok" otherButtonTitles:nil];
    [alertView show]; 
}
else {
     NSString *str1=[NSString stringWithFormat:@"Original Version: %@",appVersion];
     NSString *str2=[NSString stringWithFormat:@"2nd Version: %@",appVer2];         
     NSString *msg=[NSString stringWithFormat:@"%@\n%@",str1,str2];
     UIAlertView* alertView = [[UIAlertView alloc]
         initWithTitle:@"Different Versions!" message:msg delegate:nil
            cancelButtonTitle:@"Ok" otherButtonTitles:nil];
    [alertView show]; 
}

这两个应用程序的版本当前设置为2.11.8

我得到以下错误结果：

如果我手动设置NSString：

NSString *appVersion =@"2.11.8";
NSString *appVer2 =@"2.11.8";

我得到正确的预期结果：

我还尝试了其他方法来比较字符串，但结果始终相同，所以我猜问题出在获取键的值上？任何帮助表示赞赏