UINavigationBar Rounded Two Corners

问题:

I want to round the top right and top left of the UINavigationBar.

I know that there are functions for changing the views corner radius, but is it possible to do something similar to the standard UINavigationBar?

If you don't know what I'm talking about, check out this:

Thanks!

回答1:

The best way is to override drawRect in UINavigationBar and use a custom image.

回答2:

the following code works for me (tested on iOS5). The following code rounds the top left/right corners of the main navigation bar. Additionally, it adds a shadow to it:

CALayer *capa = [self.navigationController navigationBar].layer;
[capa setShadowColor: [[UIColor blackColor] CGColor]];
[capa setShadowOpacity:0.85f];
[capa setShadowOffset: CGSizeMake(0.0f, 1.5f)];
[capa setShadowRadius:2.0f];  
[capa setShouldRasterize:YES];


//Round
CGRect bounds = capa.bounds;
bounds.size.height += 10.0f;    //I'm reserving enough room for the shadow
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:bounds 
                                               byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerTopRight)
                                                     cornerRadii:CGSizeMake(10.0, 10.0)];

CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = bounds;
maskLayer.path = maskPath.CGPath;

[capa addSublayer:maskLayer];
capa.mask = maskLayer;

回答3:

You might find this helpful. Maybe you could also do some kind of masking with CoreAnim/Image? I'm not very knowledgeable about the Core* family...

http://foobarpig.com/iphone/uinavigationbar-with-solid-color-or-image-background.html