重寫push方法本文中達到的效果就是
self.viewControllers.count == 0估盘，就是第一個頁面設置界面（第一個界面和其他的界面不一樣艳吠，不需要返回等鍵），下面的控制器可以是一個統(tǒng)一格式，當然冯痢，程序執(zhí)行步驟是先執(zhí)行push方法元莫，然后才是各個控制器的[View didload]赖阻，所以當你下面的控制器想要其他的格式的時候可以在[View didload]的里面按需利用自己的東西覆蓋
//.h文件
#import <UIKit/UIKit.h>
@interface YLMainNavigationController : UINavigationController
@end
//.m文件
#import "YLMainNavigationController.h"
@implementation YLMainNavigationController
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationBar.barTintColor = [UIColor colorWithRed:1 green:0.8 blue:0.8 alpha:1];
//去除navigationBar下面的黑線
self.navigationBar.barStyle = UIBaselineAdjustmentNone;
}
//導航控制器里面
-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{
if (self.viewControllers.count == 0) {
self.navigationBar.backgroundColor = [UIColor colorWithRed:0.345 green:0.624 blue:0.961 alpha:1];
viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem itemWithTarget:self action:nil image:@"nav_home_logo" highLightImage:nil];;
//掃碼
viewController.navigationItem.rightBarButtonItem=[UIBarButtonItem itemWithTarget:self action:@selector(search) image:@"nav_home_sao" highLightImage:@"nav_home_sao"];
}
if (self.viewControllers.count > 0) {
viewController.navigationItem.leftBarButtonItem=[UIBarButtonItem itemWithTarget:self action:@selector(back) image:@"nav_back" highLightImage:@"nav_back"];
viewController.hidesBottomBarWhenPushed=YES;
}
[super pushViewController:viewController animated:YES];
}
-(void)search{
NSLog(@"掃碼");
//[self popToRootViewControllerAnimated:YES];//回到根視圖
}
-(void)back{
[self popViewControllerAnimated:YES];
}
寫一個UIBarButtonItem的Extension
//.h
#import <UIKit/UIKit.h>
@interface UIBarButtonItem (Extension)
+(UIBarButtonItem *)itemWithTarget:(id)target action:(SEL)action image:(NSString *)image highLightImage:(NSString *)highLightImage;
@end
//.m
#import "UIBarButtonItem+extension.h"
@implementation UIBarButtonItem (Extension)
+(UIBarButtonItem *)itemWithTarget:(id)target action:(SEL)action image:(NSString *)image highLightImage:(NSString *)highLightImage
{
UIButton *btn=[[UIButton alloc]init];
[btn addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
[btn setBackgroundImage:[UIImage imageNamed:image] forState:UIControlStateNormal];
[btn setBackgroundImage:[UIImage imageNamed:highLightImage] forState:UIControlStateHighlighted];
CGSize size=btn.currentBackgroundImage.size;
btn.frame=CGRectMake(0, 0, size.width, size.height);
return [[UIBarButtonItem alloc]initWithCustomView:btn];
}
@end
趕快試試效果吧，自己添加rootViewController踱蠢，然后看看導航上面的效果火欧，試試就知道妙處
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