除了扩展drawRect外另外一种自定义导航栏背景吗?-优快云博客

查了很多资料,网上的自定义导航栏的方法,清一色的是扩展navigationBar的drawRect方法.然而这样的扩展会影响到工程里所有的navigationBar.或许你并不想这么做,而且很多不合常规的UI用这种方法根本没法实现.

做了无数实验,尝试了各种方法,今天跟大家分享一个新方法:

 
    #import <QuartzCore/QuartzCore.h> 
   
    @interface DDNavigationViewController : UINavigationController<UINavigationControllerDelegate> { 
   
    CALayer *_barBackLayer; 
   
    } 
   
    @end

 
    @implementation DDNavigationViewController 
   
    - (id)initWithRootViewController:(UIViewController *)rootViewController { 
   
    self = [super initWithRootViewController:rootViewController]; 
   
    self.delegate = self; 
   
    return 
    self; 
   
    } 
   
    - ( 
    void 
    )loadView { 
   
    [super loadView]; 
   
    UINavigationBar *bar = self.navigationBar; 
   
    CALayer*layer = [CALayer layer]; 
   
    UIImage *navBarImage = [UIImage imageNamed:@ 
    "navigationBarBackground.png" 
    ]; 
   
    layer.contents = (id)navBarImage.CGImage; 
   
    layer.frame= CGRectMake(0, 0, 320, navBarImage.size.height); 
   
    [bar.layer insertSublayer:layer atIndex:0]; 
   
    _barBackLayer = layer; 
   
    } 
   
    #pragma mark - 
   
    #pragma mark UINavigationControllerDelegate 
   
    - ( 
    void 
    )navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:( 
    BOOL 
    )animated { 
   
    [_barBackLayer removeFromSuperlayer]; 
   
    [navigationController.navigationBar.layer insertSublayer:_barBackLayeratIndex:0]; 
   
    } 
   
    @end