再次思考UINavgationBar的自定义问题

在ios4时代的时候,我记得是可以重写drawrect的方法来替换背景图片的.

网上一搜还是有多介绍的,比如:http://www.cocoachina.com/bbs/read.php?tid=84025

另外替换返回按钮的方法,通过继承Navcontroller,在push的时候重新设定leftbuttionitem

如:

@implementation CustomNavigationController 

@synthesize isLoading;

//替换返回按钮

- (void)popself {

if (isLoading) {

NSLog(@"still loading，stop pop view");

return;

}

    [self popViewControllerAnimated:YES];

}

- (UIBarButtonItem*)createBackButton {

UIButton *btn_return=[UIButton buttonWithType:UIButtonTypeCustom];

[btn_return addTarget:self action:@selector(popself) forControlEvents:UIControlEventTouchUpInside];

[btn_return setBackgroundImage:[UIImage imageNamed:@"btn_return.png"] forState:UIControlStateNormal];

btn_return.frame=CGRectMake(0,0, 27, 25);

UIBarButtonItem *bar_itemreturn=[[[UIBarButtonItem alloc] initWithCustomView:btn_return] autorelease];

return bar_itemreturn;

/*return [[UIBarButtonItem alloc]

initWithTitle:@"返回"

style:UIBarButtonItemStyleBordered

target:self

action:@selector(popself)];*/

}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {

[super pushViewController:viewControlleranimated:animated];

if (viewController.navigationItem.leftBarButtonItem==nil && [self.viewControllers count] >1) {

        viewController.navigationItem.leftBarButtonItem =[selfcreateBackButton];

    }

}

但是ios5时代这种做法是不行的,不过也有人找到了办法.http://blog.csdn.net/viktyz/article/details/7282925

其实最简单的办法,直接隐藏掉吧.自己在视图重新弄个bar就搞定了.何必那么啰嗦.