objective-c - How to set UIDatePicker to an initial date other than "Today"

Question

I need to set the initial date to something other than "Today" so the user is forced to make a selection. I have found that if the user does NOT make a selection, the date/time is set to "nil"; I can send an UIAlertView, but that is after the fact.

I have looked at SO and Google, but found nothing. How can I do this?

UPDATE: actually, I didn't state it, but the year is not shown, only month, day and am/pm. Without the year, they might not see a future date. T

Answer 1

一个问题，你怎么知道用户不会选择你设置的特定日期？

我会用

[datePicker setDate:[NSDate date]];

在日期选择器上显示今天的日期。

Answer 2

By doing this

[datePicker setDate:yourDate];

in viewDidLoad method.

Answer 3

您可以设置未来的日期，然后还设置最小日期，以便用户只能选择未来的日期（如果这是您要查找的日期）。

以编程方式

如果您以编程方式执行所有这些操作，则应使用以下属性：

@property(nonatomic, retain) NSDate *maximumDate;
@property(nonatomic, retain) NSDate *minimumDate;
@property(nonatomic, retain) NSDate *date;

使用界面生成器

如果您通过 xib（或情节提要）文件进行操作，则在属性检查器中您可以设置所有属性：日期，还有最小和最大日期，因此如果您希望用户不能将今天设置为日期，但只有未来的日期，使用最小日期：

PS：如果您只想显示部分日期，请更改格式。

Answer 4

NSDate *todayDate = [NSDate date];

NSDate *aGo = [todayDate dateByAddingTimeInterval:-6*24*60*60];

1. 它将为日期选择器设置最小日期

   [_datePickerView setMinimumDate:aGo];

2. 当我们打开 datepickerview 时，这里设置了默认的日期位置

   [_datePickerView setDate:[NSDate date]];