返回介于两个日期之间的日期数组的方法-Swift 3

我试图得到一个日期数组，从我的一个对象的时间戳到未来30天

我使用了下面的代码，但没有得到预期的结果，并且在尝试创建标题中描述的方法时遇到了困难。任何帮助都会很好，谢谢

var dates = [Date]()
    func fetchDays() {
            let cal = Calendar.current

            var dateComponents = DateComponents()
            dateComponents.year = 2017
            dateComponents.month = 2
            dateComponents.day = 12

            guard let startDate = cal.date(from: dateComponents) else {
                return }

            var start = cal.startOfDay(for: startDate)

            for _ in 0 ... 30 {
    guard let daysBetween = cal.date(byAdding: .day, value: 1, to: startDate) else { return }
                start = daysBetween
                dates.append(start)
            }
        }

---

您正在将1添加到同一开始日期，因此您的数组将一次又一次地被同一日期填充。只需将

1

替换为循环索引+1即可

for i in 0 ... 30 {
    if let newDate = cal.date(byAdding: .day, value: i + 1, to: startDate) {
        dates.append(newDate)
    }
}

---

您不需要

start

变量。

Hi@Breezy要使其工作，只需更改一点即可

将start的to参数的值更改如下：

  for _ in 0 ... 30 {
    guard let daysBetween = cal.date(byAdding: .day, value: 1, to: start) else { return }
                start = daysBetween
                dates.append(start)
            }

var dates = [Date]()
        func fetchDays() {
            let cal = Calendar.current

            var dateComponents = DateComponents()
            dateComponents.year = 2017
            dateComponents.month = 2
            dateComponents.day = 12

            guard let startDate = cal.date(from: dateComponents) else {
                return }

            var start = cal.startOfDay(for: startDate)
            guard let endDate = cal.date(byAdding: .month, value: 1, to: start) else { return }

            guard let daysBetween = cal.dateComponents([.day], from: start, to: endDate).day else { return }

            for _ in 0 ... daysBetween {
                guard let newDate = cal.date(byAdding: .day, value: 1, to: start) else { return }
                start = newDate
                dates.append(newDate)
            }
        }

编辑：

如果您不想使用30天，可以添加一个月末，然后获得两个日期之间的天数，如下所示：

  for _ in 0 ... 30 {
    guard let daysBetween = cal.date(byAdding: .day, value: 1, to: start) else { return }
                start = daysBetween
                dates.append(start)
            }

var dates = [Date]()
        func fetchDays() {
            let cal = Calendar.current

            var dateComponents = DateComponents()
            dateComponents.year = 2017
            dateComponents.month = 2
            dateComponents.day = 12

            guard let startDate = cal.date(from: dateComponents) else {
                return }

            var start = cal.startOfDay(for: startDate)
            guard let endDate = cal.date(byAdding: .month, value: 1, to: start) else { return }

            guard let daysBetween = cal.dateComponents([.day], from: start, to: endDate).day else { return }

            for _ in 0 ... daysBetween {
                guard let newDate = cal.date(byAdding: .day, value: 1, to: start) else { return }
                start = newDate
                dates.append(newDate)
            }
        }

---

在项目后期，我需要的天数可能会从一个月变为100天，这就是为什么我认为最好使用两个日期。但是谢谢！这真的帮了大忙。哦，天哪。非常感谢！