Find the System Name & Screen Size

Find the Screen Size

CGSize result = [[UIScreen mainScreen] bounds].size;

https://coderwall.com/p/qwqpnw/resign-ipa-with-new-cfbundleidentifier-and-certificate

Find the System Name

#import <sys/utsname.h>

-(void)findversiondetails

{

    //Find device type

    struct utsname systemInfo;

     uname(&systemInfo);

     

     NSString *deviceModel = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];

     

     if ([deviceModel isEqualToString:@"iPhone4,1"] || [deviceModel isEqualToString:@"iPhone3,3"] || [deviceModel isEqualToString:@"iPhone3,2"] || [deviceModel isEqualToString:@"iPhone3,1"])

     {

         UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Title" message:deviceModel delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];

         [alert show];

     }

}