在 Objective-C 中更改屏幕方向时，如何解决日期选择器 UIView 的奇怪行为？

Question

一旦用户使用datePicker选择日期，我有这个项目需要更改应用程序的屏幕方向。 一旦用户点击Date按钮，它将显示datePicker第一个图像是纵向模式时datePicker的正确布局。

正确的纵向布局

将屏幕方向从Landscape 更改为 Portrait 时。 就会出现问题。 请参考下图。

datePicker 位于下方

一旦变成横向，下面的图像应该是正确的布局。

当您将屏幕方向更改回纵向时。 datePicker布局已更改。 请参考下图。

不正确的纵向布局

以下是使用的代码：

- (void)resizeView:(UIInterfaceOrientation)interfaceOrientation
{
//LOG(@"interfaceOrientation=%ld", (long)interfaceOrientation);
//LOG(@"self.frame =%@", NSStringFromCGRect(self.frame));
//LOG(@"self.bounds=%@", NSStringFromCGRect(self.bounds));

CGFloat x, y, w, h;
viewBack.frame = self.bounds;

#define _HEIGHT_LABEL   (40)
#define _HEIGHT_PICKER  (162)


#define _HEIGHT_TOOLBAR (CGRectGetHeight(toolBar.frame))//(44)
if (interfaceOrientation == UIInterfaceOrientationPortrait)
{
    LOG(@"[Portrait]");
    w = CGRectGetWidth(viewBack.frame);
    h = _HEIGHT_LABEL + _HEIGHT_PICKER*2 + _HEIGHT_TOOLBAR;
    viewPicker.frame = CGRectMake(0, 0, w, h);
    viewPicker.center = viewBack.center;

    x = 0;
    y = 0;
    w = CGRectGetWidth(viewPicker.frame);
    h = _HEIGHT_LABEL;
    lblTitle.frame = CGRectMake(x, y, w, h);

    x = 0;
    y = CGRectGetMaxY(lblTitle.frame);
    w = CGRectGetWidth(viewPicker.frame);
    h = _HEIGHT_PICKER;
    datePicker.frame = CGRectMake(x, y, w, h);

    x = 0;
    y = CGRectGetMaxY(datePicker.frame);
    w = CGRectGetWidth(viewPicker.frame);
    h = CGRectGetHeight(datePicker.frame); //datePickerと同じ
    timePicker.frame = CGRectMake(x, y, w, h);

    x = 0;
    y = CGRectGetMaxY(timePicker.frame);
    w = CGRectGetWidth(viewPicker.frame);
    h = _HEIGHT_TOOLBAR;
    toolBar.frame = CGRectMake(x, y, w, h);
    //LOG(@"tool  =%@", NSStringFromCGRect(toolBar.frame));
}
    else if (interfaceOrientation == UIInterfaceOrientationLandscapeRight)
{
    LOG(@"[Landscape]");
    w = CGRectGetWidth(viewBack.frame);
    h = _HEIGHT_LABEL + _HEIGHT_PICKER + _HEIGHT_TOOLBAR;
    viewPicker.frame = CGRectMake(0, 0, w, h);
    viewPicker.center = viewBack.center;

    x = 0;
    y = 0;
    w = CGRectGetWidth(viewPicker.frame);
    h = _HEIGHT_LABEL;
    lblTitle.frame = CGRectMake(x, y, w, h);

    w = CGRectGetWidth(viewPicker.frame) / 2; //画面幅の半分
    x = CGRectGetMidX(viewPicker.frame) - w;
    y = CGRectGetMaxY(lblTitle.frame);
    h = _HEIGHT_PICKER;
    datePicker.frame = CGRectMake(x, y, w, h);

    x = CGRectGetMidX(viewPicker.frame);
    y = CGRectGetMinY(datePicker.frame); //datePickerと同じ
    w = CGRectGetWidth(datePicker.frame); //datePickerと同じ
    h = CGRectGetHeight(datePicker.frame); //datePickerと同じ
    timePicker.frame = CGRectMake(x, y, w, h);

    x = 0;
    y = CGRectGetMaxY(datePicker.frame);
    w = CGRectGetWidth(viewPicker.frame);
    h = CGRectGetHeight(toolBar.frame);//44;
    toolBar.frame = CGRectMake(x, y, w, h);
}

 #if 0
LOG(@"back  =%@", NSStringFromCGRect(viewBack.frame));
LOG(@"base  =%@", NSStringFromCGRect(viewPicker.frame));
LOG(@"image =%@", NSStringFromCGRect(imageViewBlackGraBar.frame));
LOG(@"label =%@", NSStringFromCGRect(lblTitle.frame));
LOG(@"date  =%@", NSStringFromCGRect(datePicker.frame));
LOG(@"time  =%@", NSStringFromCGRect(timePicker.frame));
LOG(@"tool  =%@", NSStringFromCGRect(toolBar.frame));
LOG(@"");
 #endif
}

这是我在调查期间收集的额外信息。 下面是纵向和横向的.xib 。

Answer 1

尝试调用 [[self view] layoutIfNeeded]; 在调整大小视图中

或 [[self view] setNeedsLayout]; 当定向发生时。

如果您对系统在下一个即将到来的更新周期中更新它没问题，请使用 setNeedsLayout 如果您希望它立即更新，请使用 layoutIfNeeded。

Answer 2

您应该使用UITextField而不是UILabel并将日期选择器设置为 textField 的inputView 。