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]];

}