[英]iOS iPhone physical screen size in millimeters
有沒有辦法在iOS中獲取以毫米為單位的iPhone物理屏幕尺寸?
唯一可用的信息是每種iPhone型號的PPI,屏幕尺寸以像素為單位,而不是以毫米為單位。
這是Swift CGSize擴展,允許檢索與當前設備有關的iPhone物理屏幕尺寸(以毫米為單位):
注意:它僅支持iPhone X和更早的型號。
extension CGSize {
/**
* Physical device screen size in millimeters
*/
static func physicalDeviceScreenSize() -> CGSize? {
guard let ppi = deviceModelNameToPpiMapping[UIDevice().modelName], ppi != 0 else {
return nil
}
let width = (UIScreen.main.nativeBounds.width * 25.4) / ppi
let height = (UIScreen.main.nativeBounds.height * 25.4) / ppi
return CGSize(width: width, height: height)
}
static private var deviceModelNameToPpiMapping: Dictionary<String, CGFloat> {
// PPI values derived from https://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions
return [
"iPhone10,3": 458.0, // iPhone X
"iPhone10,6": 458.0, // iPhone X
"iPhone11,2": 458.0, // iPhone Xs
"iPhone11,4": 458.0, // iPhone Xs Max
"iPhone11,6": 458.0, // iPhone Xs Max
"iPhone11,8": 326.0, // iPhone Xr
]
}
}
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