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