除了扩展drawRect外另外一种自定义导航栏背景吗?

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;

  

    returnself;

  

}

  

- (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