maximumSignificantDigits
The maximum number of significant digits for the number formatter.
Declaration
var maximumSignificantDigits: Int { get set }Discussion
You must set the usesSignificantDigits property to true in order for this property to affect formatting behavior. By default, the maximum number of significant digits is 6. Values less than 1 are ignored.
The following code demonstrates the effect of setting maximumSignificantDigits when formatting various numbers:
var numberFormatter = NumberFormatter()
numberFormatter.usesSignificantDigits = true
numberFormatter.maximumSignificantDigits = 4
numberFormatter.string(from: 12345) // 12340
numberFormatter.string(from: 123.456) // 123.5
numberFormatter.string(from: 100.234) // 100.2
numberFormatter.string(from: 1.230) // 1.23
numberFormatter.string(from: 0.00012345) // 0.0001234