您可以在UIDatePicker中设置最大日期，如下所示：

var datePicker = UIDatePicker()
datePicker.datePickerMode = .date

// set the start date to today if you don't want to allow dates in the past
datePicker.minimumDate = Date()

// calculate +7 days
let next7Days = Calendar.current.date(byAdding: .day, value: 7, to: Date())

//set maximum date
datePicker.maximumDate = next7Days

这将只允许选择未来7天内的日期