苹果官方设计规范:https://developer.apple.com/ios/human-interface-guidelines/
设计尺寸
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点和像素 Points and Pixels
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图标 Icon
应用图标 App Icon
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分辨率和显示规格 Resolutions and Display
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UI组件布局 UI Element Layout
状态栏 Status Bar
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导航栏 Navigation Bar
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搜索栏 Search Bar
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标签栏 Tab Bar
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弹出 Modals
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提示框 Alerts
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切换 Segment Controls
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滑动条 Sliders
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切换按钮 Switch
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