Keep in mind the screen size of 480 x 320 pixels and use that as a motivation to focus the user interface on the essentials. You don't have the room to include design elements that aren't absolutely necessary, and crowding user interface elements makes your application unattractive and difficult to use. 螢幕就只有 480x320 這麼點大，促使我們必須盡量合理地利用每吋的空間。 在設計時我們不該在螢幕上放置不必要元素。 擁擠的螢幕配置讓我們的程式變得難用而不吸引人。 -- iphone Human Interface Guidelines
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