UITextField with bottom border

MGTextField.h

//
//  MGTextField
//  Megogo
//
//  Copyright (c) 2013 Megogo.net. All rights reserved.
//

#import <Foundation/Foundation.h>


@interface MGLoginTextField : UITextField

@end

MGTextField.m

//
//  MGTextField
//  Megogo
//
//  Copyright (c) 2013 Megogo.net. All rights reserved.
//

#import "MGTextField.h"


@interface MGLoginTextField ()
@property (nonatomic, strong) UIView * separatorView;
@end


@implementation MGLoginTextField

#pragma mark - Initialization

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if ( self ) {
        [self postInitialization];
    }
    return self;
}


- (id)initWithCoder:(NSCoder *)coder {
    self = [super initWithCoder:coder];
    if (self) {
        [self postInitialization];
    }
    return self;
}


- (void)awakeFromNib {
    [super awakeFromNib];
    [self postInitialization];
}


- (void)postInitialization {
    self.backgroundColor = [UIColor clearColor];
    self.separatorView = [UIView new];
    self.separatorView.backgroundColor = [UIColor colorWithWhite:1 alpha:0.3];
    [self addSubview:self.separatorView];
}


#pragma mark - Layout

- (void)layoutSubviews {
    [super layoutSubviews];
    
    CGFloat height = CGRectGetHeight(self.frame);
    CGFloat width = CGRectGetWidth(self.frame);
    CGFloat onePixelHeight = 1.0f / [[UIScreen mainScreen] scale];
    
    self.separatorView.frame = CGRectMake(0, height - 1, width, onePixelHeight);
}

@end