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I've been using UIGraphicsBeginImageContextWithOptions() and I noticed that the last field in that method is a scalefactor. And the apple docs says, if I want to set it to 0.0, then it will use the default scale factor of the device's main screen. Is there a way to get that default scale factor via property or method?
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This scaling factor is called the device pixel ratio in web APIs and device scale factor in Chromium code. A UI will always be the same size in DIPs regardless of how many pixels are actually used to display it. To go from physical pixels to DIPs we divide the physical pixel dimensions by the device scale factor.
iPhone X has a high-resolution display with a scale factor of @3x. For glyphs and other flat, vector artwork, it's best to provide resolution-independent PDFs. For rasterized artwork, provide both @3x and @2x versions of your artwork. See Image Size and Resolution and Custom Icons.
The natural scale factor associated with the screen ... This value reflects the scale factor needed to convert from the default logical coordinate space into the device coordinate space of this screen... Here is their description of nativeScale : The native scale factor for the physical screen.
The device's scale factor is a property of UIScreen. You can obtain it by:
[UIScreen mainScreen].scale; Documentation here.
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Swift 3+ version:
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