How to know the device?

I am developing a comic book using Cocoa Touch in Xcode.I dont know how to get the开发者_运维百科 details of the device whether the device is iphone, ipad or ipod.

I am trying for an universal build.

How to identify the device? Is there a way to change the screen size according to the device?

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You can use this for you first question -

   + (BOOL)isDeviceAniPad {
    #ifdef UI_USER_INTERFACE_IDIOM
        return (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad);
    #else
        return NO;
    #endif
    }

And for you second you don't need to change it your self the iphone/ipad will use use the views sizes that fits its screen. you will have to supply different images sizes or to scale them to the size of the screen.

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Don't try to check for specific device models, instead check for features of a device.

For screen size lookup UIUserInterfaceIdiom in the docs.

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NSString *deviceType = [UIDevice currentDevice].model;
NSLog(@"%@",deviceType);

       or

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if you need to differentiate between all three types of devices:

Determine device (iPhone, iPod Touch) with iPhone SDK

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UIDevice class:

NSString *deviceType = [UIDevice currentDevice].model;

if([deviceType isEqualToString:@"iPhone"])
    // it's an iPhone

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size_t size;
sysctlbyname("hw.machine", NULL, &size, NULL, 0); 
char *name = malloc(size);
sysctlbyname("hw.machine", name, &size, NULL, 0);

now you can compare like
if (strcmp(name, "iPhone1,1")) and others ... "iPhone1,2" ...