UINavigationController之NavigationItem

最新推荐文章于 2019-07-02 22:28:39 发布

原创最新推荐文章于 2019-07-02 22:28:39 发布 · 448 阅读

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本文详细介绍如何使用NavigationItem组件创建各种样式UIBarButtonItem，包括左、右BarButtonItem的创建与设置，以及导航条标题和返回按钮的定制方法。

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NavigationItem包括LeftBarButtonItem、RightBarButtonItem、BackBarButtonItem以及TitleView四个部分

创建左右 UIBarButtonItem

创建系统样式的 UIBarButtonItem

UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:nil];

创建文字样式的 UIBarButtonItem

UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithTitle:@"短信" style:UIBarButtonItemStyleDone target:self action:nil];

创建图片样式的 UIBarButtonItem

UIImage *image = [[UIImage imageNamed:@"iconfont-duanxin"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];  // 32x32 显示原色

UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStyleDone target:self action:nil];

创建继承自UIView样式的 UIBarButtonItem

UIButton *button = [UIButton buttonWithType:UIButtonTypeContactAdd];

UIBarButtonItem *item  = [[UIBarButtonItem alloc] initWithCustomView:button];

添加左右 UIBarButtonItem

[self.navigationItem setLeftBarButtonItem:leftItem];
[self.navigationItem setLeftBarButtonItems:@[leftItem1, leftItem2, leftItem3]];

[self.navigationItem setRightBarButtonItem:rightItem];
[self.navigationItem setRightBarButtonItems:@[rightItem1, rightItem2, rightItem3]];

设置导航条返回按钮 BackBarButtonItem

[self.navigationItem setBackBarButtonItem:backItem]; // 下一级界面生效,无需设置它的交互事件

设置 BarButtonItem 的一些属性

[item setTintColor:[UIColor redColor]];  // 设置item文字或图片的镂空颜色
[item setEnabled:YES];                   // 设置item的交互事件是否可用

使用NavigationItem设置导航条标题

self.title = @"导航条标题";

self.navigationItem.title = @"导航条标题";

UIView *titleView = [[UIView alloc] init];
[titleView setFrame:CGRectMake(0, 0, 100, 44)];
[titleView setBackgroundColor:[UIColor orangeColor]];
[self.navigationItem setTitleView:titleView];

其他

设置备注，关于这个界面的说明，工作很少用的
self.navigationItem.prompt = @"我是备注";

去除导航条返回按钮的标题（将标题向上移动60）

[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];

去除导航条顶部的分割线

if ([_tabBarCtrl.navigationController.navigationBar respondsToSelector:@selector( setBackgroundImage:forBarMetrics:)]){
        NSArray *list=_tabBarCtrl.navigationController.navigationBar.subviews;
        for (id obj in list) {
            if ([obj isKindOfClass:[UIImageView class]]) {
                UIImageView *imageView=(UIImageView *)obj;
                NSArray *list2=imageView.subviews;
                for (id obj2 in list2) {
                    if ([obj2 isKindOfClass:[UIImageView class]]) {
                        UIImageView *imageView2=(UIImageView *)obj2;
                        imageView2.hidden=YES;
                    }
                }
            }
        }
    }