UIView shadow

ShadowViewController.m

#import <QuartzCore/QuartzCore.h>

self.view.layer.masksToBounds = NO;
self.view.layer.shadowColor = [[UIColor blackColor] CGColor];

// Offset to bottom, left
self.view.layer.shadowOffset = CGSizeMake(-1,1);
self.view.layer.shadowRadius = 10;
self.view.layer.shadowOpacity = 1;

// Set shadow path property to improve performance when animating the view
self.view.layer.shadowPath = [UIBezierPath bezierPathWithRect:self.view.bounds].CGPath;