文档

此处整理出有用的苹果相关开发文档，供需要时查阅。

iOS 旧文档

• 举例
  • Displays - iOS Device Compatibility Reference

iOS 新文档

统一后的 = 新的

• 举例
  • UIScreen - UIKit | Apple Developer Documentation
• 且还分2种语言
  • Swift
    • https://developer.apple.com/documentation/uikit/uiscreen
      • 截图
        • 
  • Objective-C
    • https://developer.apple.com/documentation/uikit/uiscreen?language=objc
      • 截图
        • 
• 说明
  • 其中内容大体类似，主要是语法不同
    • 不过有时候细节也不太一样
• 举例
  • Objective-C中UIDeviceBatteryState中，找不到枚举值的常量值定义

UIDeviceBatteryState - UIKit | Apple Developer Documentation

typedef enum UIDeviceBatteryState : NSInteger {
    ...
} UIDeviceBatteryState;

• Constants
  • UIDeviceBatteryStateUnknown
    • The battery state for the device cannot be determined.
  • UIDeviceBatteryStateUnplugged
    • The device is not plugged into power; the battery is discharging.
  • UIDeviceBatteryStateCharging
    • The device is plugged into power and the battery is less than 100% charged.
  • UIDeviceBatteryStateFull
    • The device is plugged into power and the battery is 100% charged.

-》想要知道对应的枚举值定义的int值

-》

UIDeviceBatteryStateUnknown - UIDeviceBatteryState | Apple Developer Documentation

The battery state for the device cannot be determined.

UIDeviceBatteryStateUnknown

-》没看到定义的值

-》无意间发现，换Swift语言后：

UIDevice.BatteryState - UIDevice | Apple Developer Documentation

-》点击具体的某个定义，都可以看到具体常量枚举值定义：

• case unknown
  • The battery state for the device cannot be determined.
    • UIDevice.BatteryState.unknown - UIDevice.BatteryState | Apple Developer Documentation
    • https://developer.apple.com/documentation/uikit/uidevice/batterystate/unknown
    • case unknown = 0
• case unplugged
  • The device is not plugged into power; the battery is discharging.
    • UIDevice.BatteryState.unplugged - UIDevice.BatteryState | Apple Developer Documentation
    • https://developer.apple.com/documentation/uikit/uidevice/batterystate/unplugged
    • case unplugged = 1
• case charging
  • The device is plugged into power and the battery is less than 100% charged.
    • UIDevice.BatteryState.charging - UIDevice.BatteryState | Apple Developer Documentation
    • https://developer.apple.com/documentation/uikit/uidevice/batterystate/charging
    • case charging = 2
• case full
  • The device is plugged into power and the battery is 100% charged.
    • UIDevice.BatteryState.full - UIDevice.BatteryState | Apple Developer Documentation
    • https://developer.apple.com/documentation/uikit/uidevice/batterystate/full
    • case full = 3

-》总结来说：

此处是ObjC中看不到UIDeviceBatteryState的细节的枚举值的定义

而换成Swift的UIDevice.BatteryState，就可以看到具体的枚举的定义的常量的值了