iOS Design Themes

Design Principles

As an app designer, you have the opportunity to deliver an extraordinary product that rises to the top of the App Store charts. To do so, you’ll need to meet high expectations for quality and functionality.
作为一名产品设计师，你有机会设计出荣登App Store榜首的杰出应用，为此，你的应用的质量和功能性需要有跟高的要求。
Three primary themes differentiate iOS from other platforms:
区别于别的平台，ios有三个主要的主题：

Clarity. Throughout the system, text is legible at every size, icons are precise and lucid, adornments are subtle and appropriate, and a sharpened focus on functionality motivates the design. Negative space, color, fonts, graphics, and interface elements subtly highlight important content and convey interactivity.
清晰。纵观整个iOS系统，每种尺寸下的文字都是清晰可读的，图标都是精准的，装饰元素是微妙且适合的，且严格遵循功能驱动设计的原则。导航空间，色彩，字体，图像和界面元素都在突出重要信息，传达可交互性。
Deference. Fluid motion and a crisp, beautiful interface help people understand and interact with content while never competing with it. Content typically fills the entire screen, while translucency and blurring often hint at more. Minimal use of bezels, gradients, and drop shadows keep the interface light and airy, while ensuring that content is paramount.
遵从。流畅简洁的动效，好看的界面可以帮助人们理解内容并与之进行交互，让其在这过程中感觉不到违和感。内容基本上覆盖了整个屏幕，不透明度和模糊效果暗示下方还有更多的内容。将边框、渐变和阴影的影响降到最低，可以让界面保持透亮清晰，同时确保内容是主要可见的。
Depth. Distinct visual layers and realistic motion convey hierarchy, impart vitality, and facilitate understanding. Touch and discoverability heighten delight and enable access to functionality and additional content without losing context. Transitions provide a sense of depth as you navigate through content.
深度。独特的视觉层和逼真的动效传达出层次结构，赋予活力并帮助用户对内容理解。用户通过点触探索带来惊喜，功能实现和展示额外内容的同时不遗漏信息。当用户通过导航浏览内容时，转场能带来纵深感。

Design Principles

To maximize impact and reach, keep the following principles in mind as you imagine your app’s identity.
设计原则
为了让你的应用有更大的影响力和传播力，在你构想你应用特征时记住以下原则：

Aesthetic Integrity

Aesthetic integrity represents how well an app’s appearance and behavior integrate with its function. For example, an app that helps people perform a serious task can keep them focused by using subtle, unobtrusive graphics, standard controls, and predictable behaviors. On the other hand, an immersive app, such as a game, can deliver a captivating appearance that promises fun and excitement, while encouraging discovery.
美学完整性
美学完整性是一款应用的美观度和其功能的一致性。比如说，一款帮助人们完成任务的应用可以通过微妙的，不起眼的图素，标准化控件和行为预来保证他们专注于任务本身。另一方面，像游戏应用这样的沉浸式应用，可以通过精美的界面传达出愉悦与惊喜，于此同时鼓励玩家向前探索。

Consistency

A consistent app implements familiar standards and paradigms by using system-provided interface elements, well-known icons, standard text styles, and uniform terminology. The app incorporates features and behaviors in ways people expect.
一致性
一款拥有一致性的应用通过使用系统提供的界面组件，用户熟悉的图标，标准的字体样式，正式术语来达到相似的标准和范式。应用的特征应该采用人们期望的方式展示。

Direct Manipulation

The direct manipulation of onscreen content engages people and facilitates understanding. Users experience direct manipulation when they rotate the device or use gestures to affect onscreen content. Through direct manipulation, they can see the immediate, visible results of their actions.
操作直接
对屏幕内容的直接操作可以吸引用户并帮助用户理解。当用户旋转设备或使用手势影响一屏内容时，用户就会经历直接操作（用户的直接操作包括但不限于旋转设备或使用手势）。通过直接操作，他们可以看到他们行为带来了的即时可见的结果。

Feedback

Feedback acknowledges actions and shows results to keep people informed. The built-in iOS apps provide perceptible feedback in response to every user action. Interactive elements are highlighted briefly when tapped, progress indicators communicate the status of long-running operations, and animation and sound help clarify the results of actions.
反馈
反馈确认行为并展示行为结果，并通知用户。ios的内置应用为每个用户行为提供可被感知到的反馈。交互组件当被点击时会短暂高亮，进度指示器展示出长时间的系统运行状态，动效与音效强化动作结果。

Metaphors

People learn more quickly when an app’s virtual objects and actions are metaphors for familiar experiences—whether rooted in the real or digital world. Metaphors work well in iOS because people physically interact with the screen. They move views out of the way to expose content beneath. They drag and swipe content. They toggle switches, move sliders, and scroll through picker values. They even flick through pages of books and magazines.
隐喻
一个内容与行为都是使用用户熟悉的隐喻（无论是现实世界还是虚拟世界）的应用可以让用户较快地上手。因为用户是真实地与屏幕交互的，所以隐喻在ios中应用地很好。他们可以像在现实世界那样，拖动和滑动内容、拨动开关，滑动滑块并通过数值选择器选择数值、甚至可以翻动书和杂志。

User Control

Throughout iOS, people—not apps—are in control. An app can suggest a course of action or warn about dangerous consequences, but it’s usually a mistake for the app to take over the decision-making. The best apps find the correct balance between enabling users and avoiding unwanted outcomes. An app can make people feel like they’re in control by keeping interactive elements familiar and predictable, confirming destructive actions, and making it easy to cancel operations, even when they’re already underway.

用户可控
纵观ios系统，用户都是在控制应用，而不是应用在控制用户。一款APP可以给予用户一系列操作意见或者警告用户一些危险的结果，但是对于应用来说直接作出决定是错误的。最好的应用是在引导用户和避免出现不如意的结果之间寻找完美平衡点。一款应用可以通过一些方式让用户感受到控制感，包括熟悉及可预测的交互方式，确定不可撤销行为，以及即使当用户已经在操作过程中依然可以取消操作。