对于UIPopoverController中的某些模式，UIDatePicker无法正确呈现 [英] UIDatePicker not rendering properly for certain modes in UIPopoverController

问题描述

我有一个 UIDatePicker 使用我在iPhone应用程序中模拟使用的 UIDatePickerModeTime ，工作正常：

I have a UIDatePicker using UIDatePickerModeTime that I use in an iPhone app modally, works fine:

为iPad使用相同的基本代码，但将视图放在 UIPopoverController 中会产生一些非常不一致的结果。我想要的模式（ UIDatePickerModeTime ）加上其他三种模式如下所示。请注意其中2个根本没有呈现，而是没有内容

Using this same basic code for iPad, but putting the view in a UIPopoverController gives some pretty inconsistent results. My desired mode (UIDatePickerModeTime) plus the other three modes are shown below. Notice how 2 of them are not rendering at all, but instead have no content

UIDatePickerModeTime

UIDatePickerModeCountDownTimer

UIDatePickerModeDateAndTime

UIDatePickerModeDate

可能导致 UIDatePickerModeTime 和 UIDatePickerModeDateAndTime 模式去干扰？

What could be causing the UIDatePickerModeTime and UIDatePickerModeDateAndTime modes to go haywire?

推荐答案

实例化 UIDatePicker CGRectZero 是罪魁祸首。即使代码在iPhone上工作，我也明确地调用 sizeToFit 来设置大小，将 CGRectZero 更改为 CGRectMake（0,0,320,160）是显示它的原因。去图。

Instantiating the UIDatePicker with CGRectZero was the culprit. Even though the code worked on iPhone, and I call sizeToFit explicitly on it to set the size, changing the CGRectZero to CGRectMake(0,0,320,160) was what got it to display. Go figure.

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