UITextField subclass to add inner shadow, text and placeholder insets

GolopoTextField.h

//
//  GolopoTextField.h
//  Golopo
//
//  Created by Esense-15 on 05/09/14.
//  Copyright (c) 2014 esense. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface GolopoTextField : UITextField

@end

GolopoTextField.m

//
//  GolopoTextField.m
//  Golopo
//
//  Created by Esense-15 on 05/09/14.
//  Copyright (c) 2014 esense. All rights reserved.
//

#import "GolopoTextField.h"

@implementation GolopoTextField

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        [self applyShadow];
    }
    return self;
}

-(void)applyShadow {
    
    self.layer.cornerRadius = 3.0f;
    [self setBackgroundColor:[[UIColor blackColor] colorWithAlphaComponent:0.3]];
    
    CAShapeLayer* shadowLayer = [CAShapeLayer layer];
    [shadowLayer setFrame:self.bounds];
    
    // Standard shadow stuff
    [shadowLayer setShadowColor:[[UIColor colorWithWhite:0 alpha:0.3] CGColor]];
    [shadowLayer setShadowOffset:CGSizeMake(-2.0f, 2.0f)];
    [shadowLayer setShadowOpacity:1.0f];
    [shadowLayer setShadowRadius:1];
    
    // Causes the inner region in this example to NOT be filled.
    [shadowLayer setFillRule:kCAFillRuleEvenOdd];
    
    // Create the larger rectangle path.
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddRect(path, NULL, CGRectInset(self.bounds, -42, -42));
    
    // Add the inner path so it's subtracted from the outer path.
    // someInnerPath could be a simple bounds rect, or maybe
    // a rounded one for some extra fanciness.
    CGPathRef someInnerPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:3.0f].CGPath;
    CGPathAddPath(path, NULL, someInnerPath);
    CGPathCloseSubpath(path);
    
    [shadowLayer setPath:path];
    CGPathRelease(path);
    
    [self.layer addSublayer:shadowLayer];
    
    CAShapeLayer* maskLayer = [CAShapeLayer layer];
    [maskLayer setPath:someInnerPath];
    [shadowLayer setMask:maskLayer];
}

// placeholder position
- (CGRect)textRectForBounds:(CGRect)bounds {
    return CGRectInset(bounds, 5, 5);
}

// text position
- (CGRect)editingRectForBounds:(CGRect)bounds {
    return CGRectInset(bounds, 5, 5);
}

@end