UIAppearance

#pragma mark - 定制全局的Bar

-(void)customAllBar{

    //定制所有的Bar的背景颜色和标题外观

    [UINavigationBar appearance].barTintColor = [UIColor lightGrayColor];

    //NSDictionary :@{属性名:对象}

    [UINavigationBar appearance].titleTextAttributes = @{NSFontAttributeName : [UIFont systemFontOfSize:40],NSForegroundColorAttributeName : [UIColor yellowColor]                                                       };

}

#pragma mark - 定制全局的ToolBarButtonItem

-(void)customToolBarButtonItem{

    //修改的是NavigationBar和Toolbar上得所有不是图片的NavigationItem的背景

    //[[UIBarButtonItem appearance] setBackButtonBackgroundImage:[UIImage imageNamed:@"header_bg"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

    

    //修改所有在UIToolbar出现过的UIBarButtonItem把他们的背景变成Blue

    [[UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UIToolbar class]] ] setTintColor:[UIColor blueColor]];

    

}