iOS7 - Change UINavigationBar border color

Question

Is it possible to change the grey border-bottom color of the UINavigationBar in iOS7?

I already tried to remove to border, but this is not working:

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Answer 1

Here is another way:

CALayer *border = [CALayer layer];
border.borderColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"border"]].CGColor;
border.borderWidth = 1;
CALayer *layer = self.navigationController.navigationBar.layer;
border.frame = CGRectMake(0, layer.bounds.size.height, layer.bounds.size.width, 1);
[layer addSublayer:border];