iOS中UIDatePicker的默认日期 [英] Default Date for UIDatePicker in iOS

问题描述

我是iOS开发的新手.我的故事板上有这个ViewController(包括一个UIDatePicker和一个条形按钮):

I am new in iOS development. I have this ViewController in my Storyboard (includes a UIDatePicker and a bar button):

我按照数据单元进行了调用我的DatePicker.当用户单击页面上的按钮PickerDate时，在导航栏上弹出带有完成栏的按钮:

I followed Data Cell to call my DatePicker. When user click on a button in the page PickerDate pops up with a done bar button on the navigation bar:

问题在于它仅将当前日期显示为 default .当我从属性"中进行设置时，没有任何变化:

The problem is it shows just the current date as default. Nothing changes when I set it from Properties:

您知道该如何解决吗?(通过设置属性或以编程方式).

Do you know how can I fix it? (by setting up the properties or programmatically).

推荐答案

我是通过编程方式完成的:

I did it programmatically in this way :

NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];
[components setYear:1980];
[components setMonth:1];
[components setDay:1];
NSDate *defualtDate = [calendar dateFromComponents:components];
pickerView.date = defualtDate;

但是仍然不知道为什么通过设置属性无法使用它.有帮助吗?

But still don't know why it doesn't work by setting up the properties. Any help?

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