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;

    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