Navigation Bar Guide

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A navigation bar appears at the upper edge of an application screen, just below the status bar.

A navigation bar usually displays the title of the current screen or view, centered along its length.

A navigation bar enables navigation through an information hierarchy and, optionally, management of screen contents.

A navigation bar can be translucent or opaque.

On iPhone, a navigation bar always displays across the full width of the screen.
On iPad, a navigation bar can display within a view, such as one pane of a split view, that does not extend across the screen.

Use the title of the current view as the title of the navigation bar.
When the user navigates to a new level, two things should happen:

  • The bar title should change to the new level’s title.
  • A back button should appear to the left of the title, and it should be labeled with the previous level’s title.

Use a toolbar instead of a navigation bar if you need to offer a larger set of controls, or you do not need to enable navigation.

Consider putting a segmented control in a navigation bar at the top level of an application.

Avoid crowding a navigation bar with additional controls, even if there appears to be enough space.

Use system-provided buttons according to their documented meaning.

If appropriate, customize the appearance of a navigation bar.

Make sure that a customized back button still looks like a back button.

Don’t create a multisegment back button.

On iPhone, take into account the automatic change in navigation bar height that occurs on device rotation.

总结:

navigation bar主要有两个用途:

  • 类似于面包屑,但是一般只有一个后退到前一个view的按钮,可以告诉我们当前是哪个页面,以及用来做页面层级之间的进退
  • 管理当前屏幕上的内容,例如,修改,排序等等

navigation bar可以是透明或者不透明的,需要注意的是,navigation bar不建议放太多的东西,一般就是左,中,右,左边是后退按钮,中间是title,右边是一个操作按钮,如果我们需要很多的操作按钮,建议使用tool bar

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