Adding toolbar to navigation controller - color mismatch

I used following code to add multiple buttons to the navigation controller

UIToolbar* toolbar = [[UIToolbar alloc]
                      initWithFrame:CGRectMake(0, 0, 100, 44)];
toolbar.tintColor = [UIColor cle开发者_如何学PythonarColor];
[toolbar setBarStyle: UIBarStyleBlackTranslucent];

...

The problem is the background of the toolbar does not match 100% to the navigation bar. There is a small line showing at the top of the toolbar. The color is almost the same but if you look carefully you can see the rectangle …

I do following in the delegate to set the background of the navigation bar

self.navigationController.navigationBar.tintColor =  [UIColor colorWithRed:.0 green:.0 blue:.0 alpha:.4];

any ideas how to get the background color to match the navigation bar color?

The best way to make this work is to make the toolbar fully transparent. One way to do this is to subclass UIToolbar and override drawRect: to do nothing.

Here's my implementation of a UITransparentToolbar (note this assumes the toolbar will be created via a xib.):

@implementation UITransparentToolbar

- (id)initWithCoder:(NSCoder *)decoder
{
    if ( self = [super initWithCoder:decoder] )
    {
        self.backgroundColor = [UIColor clearColor];
        self.opaque = NO;
        self.translucent = YES;

    }
    return self;
}

- (void)drawRect:(CGRect)rect 
{
}

- (void)dealloc 
{
    [super dealloc];
}

@end

Looks like iOS 5 or later supports this without a trick according to this answer:

https://stackoverflow.com/a/9109910/1179521

And it worked for me!