仅重置UIDatePicker的一部分

// 获取当前日期和时间组件
let calendar = Calendar.current
let currentComponents = calendar.dateComponents([.year, .month, .day, .hour, .minute, .second], from: datePicker.date)

// 修改需要重置的日期和时间组件
var newComponents = DateComponents()
newComponents.year = 2022 // 设置新的年份
newComponents.month = currentComponents.month
newComponents.day = currentComponents.day
newComponents.hour = currentComponents.hour
newComponents.minute = currentComponents.minute
newComponents.second = currentComponents.second

// 重新设置UIDatePicker的日期和时间
let newDate = calendar.date(from: newComponents)
datePicker.date = newDate ?? Date()