Я написал небольшой модульный тест, и он остановился на контрольной точке останова с журналом:
Задание позиционных единиц с пробелами неоднозначно и поэтому не поддерживается
func test_formatter() {
func randomUnits() -> NSCalendar.Unit {
let availableUnitsRawValues: [UInt] = [1 << 2, 1 << 3, 1 << 12, 1 << 4, 1 << 5, 1 << 6, 1 << 7] // Corresponding to [.year, .month, .weekOfMonth, .day, .hour, .minute, .second]
let nrUsedUnits = Int.random(in: 1 ... availableUnitsRawValues.count)
let shuffeledAvailableUnitsRawValues = availableUnitsRawValues.shuffled
let usedUnitsRawValues = shuffeledAvailableUnitsRawValues[ 0 ..< nrUsedUnits]
let usedUnitsRawValue = usedUnitsRawValues.reduce(0, |)
let usedUnits = NSCalendar.Unit.init(rawValue: usedUnitsRawValue)
return usedUnits
}
func randomStyle() -> DateComponentsFormatter.UnitsStyle {
let randomStyleIndex = Int.random(in: 0 ... 5)
let randomStyle = DateComponentsFormatter.UnitsStyle.init(rawValue: randomStyleIndex)!
return randomStyle
}
func randomDate() -> Date {
let randomDayInterval = Double.random(in: -10 ... 10)
let randomDate = Date.init(timeIntervalSinceNow: randomDayInterval * 24 * 60 * 60)
return randomDate
}
func randomComponents() -> Set<Calendar.Component> {
let availableComponents: Set<Calendar.Component> = [.year, .month, .weekOfMonth, .day, .hour, .minute, .second]
let nrUsedComponents = Int.random(in: 1 ... availableComponents.count)
let shuffeledAvailableComponents = Array(availableComponents).shuffled
let usedComponents = shuffeledAvailableComponents[ 0 ..< nrUsedComponents]
return Set(usedComponents)
}
for _ in 0 ..< 10 {
let units = randomUnits()
for _ in 0 ..< 10 {
let style = randomStyle()
for _ in 0 ..< 10 {
let components = randomComponents()
let formatter = DateComponentsFormatter()
// `units` is a user customizable array of NSCalendar.Unit, limited to a subset of [.year, .month, .weekOfMonth, .day, .hour, .minute, .second]
formatter.allowedUnits = units
// `style` is a user choosable selection of the DateComponentsFormatter.UnitsStyle enum
formatter.unitsStyle = style
// `components` is a user customizable array of Calendar.Component, limited to a subset of [.year, .month, .weekOfMonth, .day, .hour, .minute, .second]
let dateComponents = Calendar.current.dateComponents(components,
from: randomDate(),
to: randomDate())
var yyy = formatter.string(from: dateComponents) ?? "" // Crash here
}
}
}
}
Вот еще немного информации:
![enter image description here](https://i.stack.imgur.com/U3rL3.png)