苹果iOS 14设计资源 /设计规范Apple Design Resource，
苹果iOS 14设计资源下载（Photoshop、sketch、xd）
https://developer.apple.com/design/resources/
技术、设计的发展，都是让入门和使用的门槛更低。比如iOS 14 的设计资源，可以给你各种符合iOS视觉规范的元素，PS、sketch等主流设计工具都能用。对于很多独立开发者，这样的标准和辅助资源非常棒。
联想起阿里巴巴的鲁班设计系统，其实对于电商这样标准化的作业流程，很多内容是可以通过机器、人工智能、标准化的方式，去提高生产的效率，降低人类入门门槛。当然更尖端和创造性的事情，需要人的大脑，这个无法被替代。
苹果UI设计规范，人机交互设计指导，Human Interface Guidelines;
https://developer.apple.com/design/human-interface-guidelines/ios/overview/themes/
设计原则
审美完整性 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.
一致性 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.
直接操作 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.
操作反馈 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.
隐喻和暗示 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.
用户可控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.
