IOS 一个继承UINavigationController的子类

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#import <UIKit/UIKit.h>@interface BasicNavigationController : UINavigationController@end

#import "BasicNavigationController.h"@interface BasicNavigationController ()@end@implementation BasicNavigationController- (void)viewDidLoad {    [super viewDidLoad];    // 1.appearance方法返回一个导航栏的外观对象    // 修改了这个外观对象，相当于修改了整个项目中的外观    UINavigationBar *bar = [UINavigationBar appearance];    // 2.设置导航栏的背景图片    //2.1修改导航栏系统返回箭头图片    bar.backIndicatorImage = [UIImage imageNamed:@"nav_backItem_white"];    bar.backIndicatorTransitionMaskImage = [UIImage imageNamed:@"nav_backItem_white"];    //2.2设置shadowImage    [bar setBarStyle:UIBarStyleBlackTranslucent];    bar.shadowImage = [[UIImage alloc] init];    //2.3设置导航栏颜色    [bar setTintColor:[UIColor whiteColor]];    [bar setBarTintColor:KGlobalBlueColor];    // 3.设置导航栏文字的主题    [bar setTitleTextAttributes:@{                                  NSFontAttributeName : KFontHeadline,                                  NSForegroundColorAttributeName : [UIColor whiteColor]                                  }];    // 4.修改所有UIBarButtonItem的外观    UIBarButtonItem *barItem = [UIBarButtonItem appearance];    //4.1设置返回不需要文字    //注:添加此方法，切换应用会出现一闪//    [barItem setBackButtonTitlePositionAdjustment:UIOffsetMake(NSIntegerMin, NSIntegerMin) forBarMetrics:UIBarMetricsDefault];    // 5.修改item上面的文字样式    NSDictionary *dict = @{                           NSFontAttributeName: KFontSubhead,                           NSForegroundColorAttributeName : [UIColor whiteColor]                           };    NSDictionary *dictEnable = @{                                 NSFontAttributeName: KFontSubhead,                                 NSForegroundColorAttributeName: KGreyColor,                                 };    [barItem setTitleTextAttributes:dict forState:UIControlStateNormal];    [barItem setTitleTextAttributes:dict forState:UIControlStateHighlighted];    [barItem setTitleTextAttributes:dictEnable forState:UIControlStateDisabled];}@end

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