Howto findout how many pixels are one centimeter in ios (swift)

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I would like to draw a line with exact one centimeter on any IOS Device. How can I get the pixels for one centimeter ?

In Android and Java I would do something like following:

public float getPixelsperCentimeter(){
    float finchpercm = 1.0f / 2.54f;
    Display display = getWindowManager().getDefaultDisplay();
    DisplayMetrics metrics = new DisplayMetrics();
    display.getMetrics(metrics);

    return metrics.densityDpi * finchpercm ;
}

asked 2 mins ago

user1344545

776

Howto findout how many pixels are one centimeter in ios (swift)