Creates a UIButton with a custom view that mimics the style of a UIBarButtonSystemItem.

UIButton+Convenience.m

#import <UIKit/UIKit.h>

@interface UIButton (Convenience)

+ (id)buttonWithBarItemStyleAndCustomView:(UIView *)customView;

@end

@implementation UIButton (Convenience)

+ (id)buttonWithBarItemStyleAndCustomView:(UIView *)customView {
    UIButton *button = [self buttonWithType:UIButtonTypeCustom];
    UIImage *back = [[UIImage imageNamed:@"UINavigationBarBlackTranslucentButton.png"]
                     stretchableImageWithLeftCapWidth:5.0
                     topCapHeight:0.0];
    UIImage *pressed = [[UIImage imageNamed:@"UINavigationBarBlackTranslucentButtonPressed.png"]
                        stretchableImageWithLeftCapWidth:5.0
                        topCapHeight:0.0];
    button.frame = CGRectMake(0, 0, 34.0f, 30.0f);
    [button setBackgroundImage:back forState:UIControlStateNormal];
    [button setBackgroundImage:pressed forState:UIControlStateSelected];
    [button setBackgroundImage:pressed forState:UIControlStateHighlighted];
    [button addSubview:customView];
    customView.userInteractionEnabled = NO;
    customView.frame = CGRectCenterRectInRect(customView.frame, button.frame);
    return button;
}

@end