你如何缩小iPhone上的UIPickerView？ [英] How do you shrink a UIPickerView on the iPhone?

问题描述

我想在我的iPhone应用程序中减少 UIPickerView 的高度，以便它只显示一行和一列。拾取器视图的高度应该等于行的高度。

I would like to reduce the height of a UIPickerView in my iPhone app, so that it shows only one row and one column. The height of the picker view should be equal to the height of a row.

我正在使用Interface Builder来构造 UIPickerView ，但我找不到一个简单的方法来重新调整此控件的大小。

I'm using Interface Builder to construct the UIPickerView, but I can't find an easy way to re-size this control.

如何缩小 UIPickerView ？

推荐答案

实际上，您可以通过将仿射变换应用于封闭视图来略微收缩整个UIPickerView。例如：

Actually, you can slightly shrink the whole UIPickerView by applying an affine transform to an enclosing view. For example:

CGSize pickerSize = [pickerView sizeThatFits:CGSizeZero];

pickerTransformView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, pickerSize.width, pickerSize.height)];
pickerTransformView.transform = CGAffineTransformMakeScale(0.75f, 0.75f);

[pickerTransformView addSubview:pickerView];
[self.view addSubview:pickerTransformView];
[pickerTransformView release];

将选择器缩放到原始大小的75％，方法是将其放置在包含视图中并应用缩放转换为该视图。将变换直接应用于UIPickerView会导致不合需要的绘图工件。

will scale a picker to 75% of its original size by placing it within a containing view and applying a scaling transform to that view. Applying a transform directly to the UIPickerView leads to undesirable drawing artifacts.

但是，通过创建自定义控件可以最好地满足您所需的调整大小。

However, the kind of resizing you're looking for would be best served by creating a custom control.

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