如何自定义NavBar？

Question

我使用以下代码将自定义导航栏添加到我的应用。但是我希望能够根据视图更改导航栏，这可能吗？

@implementation UINavigationBar (UINavigationBarCategory)
- (void)drawRect:(CGRect)rect 
{
    UIColor *color = [UIColor colorWithRed:82/255.0 green:80/255.0 blue:81/255.0 alpha:1.0];
    UIImage *img  = [UIImage imageNamed: @"navbar.png"];
    [img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
    self.tintColor = color;
}

@end

如果没有，是否可以只将图像添加到导航栏而不是标题文本？

Answer 1

我强烈建议不要使用类别覆盖UINavBar上的-drawRect，因为此设计将打破即将发布的iOS版本。

虽然可以很容易地为navBar标题创建自定义图像和按钮。这是我直接从我的一个应用程序的生产代码中提取的一些代码片段。它在navBar的标题区域中创建了一个自定义图像按钮，但创建图像同样容易：

- (void) viewDidLoad {
    UIButton *titleButton = [self buttonForTitleView];
    [titleButton setTitle:newTitle forState:UIControlStateNormal];
    [titleButton sizeToFit];

    self.navigationBar.topItem.titleView = titleButton;

}

- (UIButton *) buttonForTitleView {
    if (!_buttonForTitleView) {
        UIImage *buttonImage = [UIImage imageNamed:@"button_collection_name2"];
        UIImage *pressedButtonImage = [UIImage imageNamed:@"button_collection_name2_pressed"];
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        [button setBackgroundImage: buttonImage forState : UIControlStateNormal];
        [button setBackgroundImage: pressedButtonImage forState : UIControlStateHighlighted];
        [button setFrame:CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height)];
        [button setTitleColor:[UIColor colorWithRed:38.0/255.0 green:38.0/255.0 blue:38.0/255.0 alpha:1.0] forState:UIControlStateNormal];
        [button setTitleShadowColor:[UIColor colorWithRed:230.0/255.0 green:230.0/255.0 blue:230.0/255.0 alpha:1.0] forState:UIControlStateNormal];
        button.titleLabel.adjustsFontSizeToFitWidth = YES;
        button.titleLabel.minimumFontSize = 10.0;
        button.titleEdgeInsets = UIEdgeInsetsMake(0.0, 10.0, 0.0, 10.0);
        button.titleLabel.shadowOffset = (CGSize){ 0, 1 };
        [button addTarget:self action:@selector(presentWidgetCollectionSwitchingViewController:) forControlEvents:UIControlEventTouchUpInside];
        _buttonForTitleView = [button retain];
    }    
    return _buttonForTitleView;
}

这就是应用VideoBot中按钮的样子：

以下是使用图像作为导航栏标题的示例：

UIImage  *titleImage = [UIImage imageNamed:@"navbar_title_image"];
UIImageView *titleImageView = [[[UIImageView alloc] initWithImage:titleImage] autorelease];

UIView *container = [[[UIView alloc] initWithFrame:(CGRect){0.0, 0.0, titleImage.size.width, titleImage.size.height}] autorelease];
container.backgroundColor = [UIColor clearColor];
[container addSubview:titleImageView];

// add the view to the title
self.navigationBar.topItem.titleView= container;