知乎日报 ios 客户端首页 NavigationBar 的实现

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知乎日报的导航栏做的很赞～但是ios里很难动态地修改navigation bar和status bar的颜色，所以写了一个UINavigationBar的Category：

https://github.com/ltebean/LTNavigationbar

实际效果如下：
LTNavigationbar

知乎

日报

navigation

17 replies • 2015-03-11 14:51:57 +08:00

Esay

Feb 17, 2015

赞。
提个小建议，能不能在用手势 push back 时也让 nav bar 动态变化

hewigovens

Feb 17, 2015

知乎日报那个应该没用 UINavigationController...

SeanChense

Feb 17, 2015

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
UIColor * color = [UIColor colorWithRed:0/255.0 green:175/255.0 blue:240/255.0 alpha:1];
CGFloat offsetY = scrollView.contentOffset.y;
if (offsetY > NAVBAR_CHANGE_POINT) {
CGFloat alpha = 1 - ((NAVBAR_CHANGE_POINT + 64 - offsetY) / 64);

[self.navigationController.navigationBar useBackgroundColor:[color colorWithAlphaComponent:alpha]];
} else {
[self.navigationController.navigationBar useBackgroundColor:[color colorWithAlphaComponent:0]];
}
}

这段逻辑有没有可能放到 `UINavigationBar+BackgroundColor.h` 里呢？