Obtain the size of application screen

Obtain the size of application screen:

CGRect frame = [UIScreen mainScreen].applicationFrame; Or

CGRect frame = [UIScreen mainScreen] bounds];

Obtain the width of application screen (Same way for height):

UIWindow* window = [UIApplication sharedApplication].keyWindow;
float width = window.frame.size.width;

Or, float width = [UIScreen mainScreen] bounds].size.width;