在自定义UINavigationBar中绘图，附加到顶部

问题描述

我有一个 UINavigationBar 的子类。它是 barPosition 是 UIBarPositionTopAttached 。
比我在子类中重写 - （void）drawRect：（CGRect）rect 。作为参数出现的 rect 总是高44像素，我只能在这个矩形内画画。因此，我无法在状态栏上执行绘制，并且它具有默认外观。如果我评论 -drawRect out，它看起来与预期的一样，导航栏和状态栏看起来整体并且高度为64像素。有没有办法在 UINavigationBar 的子类中覆盖 -drawRect：来实现这种效果？

I have a subclass of UINavigationBar. It's barPosition is UIBarPositionTopAttached.Than I override -(void)drawRect:(CGRect)rect in my subclass. The rect, that comes as parameter, has always 44 px height, and I can draw only inside this rect. So, I can't perform drawing over the status bar and it has default look. If I comment -drawRect out, than it looks as expected, navigation bar and status bar look as a whole and have 64 px height. Is there a way to achieve this effect with having overrided -drawRect: in subclass of UINavigationBar?

推荐答案

我遇到了一个带有背景图像的自定义UINavigationBAr的问题，当我添加时，它不会出现在iOS 7的半透明状态栏下面drawRect中的图像。

I had a the issue of a custom UINavigationBAr with a background image which would not appear under the translucent Status Bar on iOS 7 when I was adding the image in drawRect.

将背景图像移动到ViewControllers viewDidLoad方法后，背景图像显示在状态栏下

After moving the background image to the ViewControllers viewDidLoad Method, the background image then appeared under the Status Bar

-(void)viewDidLoad
{
 if (UI_USER_INTERFACE_IDIOM() != UIUserInterfaceIdiomPad)
{
    UIImage *image = [UIImage imageNamed:@"nav-bg-ipad.png"];
    [self.navigationController.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
}else{
    UIImage *image = [UIImage imageNamed:@"nav-bg-iphone.png"];
    [self.navigationController.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
}
// do your other stuff now …

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