PhotoSelectButton - Objective C/iOS

PhotoSelectButton.m

#import <UIKit/UIKit.h>

@interface PhotoSelectButton : UIButton

+ (instancetype)button;

@end

#define COVER_SECTION_AREA 0.33

@implementation PhotoSelectButton
{
    UIView *_coverView;
}

+ (instancetype)button
{
    PhotoSelectButton *button = ({
        PhotoSelectButton *b = [PhotoSelectButton buttonWithType:UIButtonTypeCustom];
        b;
    });

    return button;
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];

    if (self) {
        [self setupViews];
    }

    return self;
}

- (void)setupViews
{
    [self setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];

    _coverView = ({
        UIView *v = [[UIView alloc] init];
        v.backgroundColor = [[UIColor grayColor] colorWithAlphaComponent:0.5];
        v.userInteractionEnabled = NO;
        v;
    });

    [self addSubview:_coverView];

    [self setupConstraints];
}

- (void)setupConstraints
{
    PhotoSelectButton *button = self;
    UIView *coverView = _coverView;
    coverView.translatesAutoresizingMaskIntoConstraints = NO;

    NSDictionary *views = NSDictionaryOfVariableBindings(coverView,button);

    [button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[coverView(==button)]|" options:kNilOptions metrics:nil views:views]];

    [button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[coverView]|" options:kNilOptions metrics:nil views:views]];

    [button addConstraint:[NSLayoutConstraint constraintWithItem:coverView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:button attribute:NSLayoutAttributeHeight multiplier:COVER_SECTION_AREA constant:0]];
}

- (void)layoutSubviews
{
    [super layoutSubviews];

    self.layer.cornerRadius = self.frame.size.width/2;
    self.layer.masksToBounds = YES;

    CGFloat coverAreaHeight = self.frame.size.height * COVER_SECTION_AREA;
    CGFloat labelPadding = 2;
    CGFloat fontSize = coverAreaHeight - (labelPadding * 2);

    CGFloat insetTop = (self.frame.size.height - coverAreaHeight) - labelPadding * 2;

    [self setTitleEdgeInsets:UIEdgeInsetsMake(insetTop, 0, 0, 0)];

    self.titleLabel.font = [UIFont systemFontOfSize:fontSize];
}
@end