how to close application using command

[[UIApplication sharedApplication] terminate];

You forgot to use the { code } tags..

[[UIApplication sharedApplication] terminate];

On a side note: This gets a warning from Xcode, saying that the receiver might not understand the message. It works, though.

I am pretty sure you can also use the C-command

exit(0);

I did not try it myself though.

Exit should work, but Apple strongly discourages the use of this method. It should only be used in extreme conditions such as low memory conditions upon starting your application etc.. You should popup a message before calling exit with an reason why.

If you programatically exit your problem then it just vanishes, the transition animation does not appear and the user will look confused unless you tell them why you're exiting.

terminate is neither declared in the UIApplication header nor specified in the Help.

Is it safe to use this method? Any other alternative?

Thanks in advance,

-TRS

UIApplication *app = [UIApplication sharedApplication];
SEL selector = @selector( terminate );

if ([app respondsToSelector:selector] )
{
id result = [app performSelector:selector];
}

This code will help you to exit the application, for more details refer NSObject, (performSelector), you can get what you expect. 🙂