判斷機器是iPhone還是iPad

UIDevice* thisDevice = [UIDevice currentDevice];
if(thisDevice.userInterfaceIdiom == UIUserInterfaceIdiomPhone)
{

}
else
{

}

說明:
UIDevice物件有個userInterfaceIdiom property，
@property(nonatomic,readonly) UIUserInterfaceIdiom userInterfaceIdiom
其值有以下2種:

typedef NS_ENUM(NSInteger, UIUserInterfaceIdiom) {
    UIUserInterfaceIdiomPhone,      
    UIUserInterfaceIdiomPad,        
};