水平调整的UITextField使用自动布局文本 [英] Resize UITextField horizontally with text using Auto Layout

问题描述

这是示例项目来演示跌破发行可以在这里找到：<一href=\"https://github.com/markdorison/UITextFieldContentSizeExample/\">https://github.com/markdorison/UITextFieldContentSizeExample/

我试图有一个的UITextField成长/它包含了使用自动布局的文本内容缩减其宽度。我创建了领先，并与749优先尾随约束（而不是默认：1000）。我也曾尝试降低这些限制的优先一路下降到1，但是这似乎并没有对行为产生显着影响。

通过听取UIControlEventEditingChanged事件，我触发intrinsicContentSize的复位：

   - （IBAction为）textFieldDidChange：（*的UITextField）文本框{
    [UIView的animateWithDuration：0.1动画：^ {
        [文本框invalidateIntrinsicContentSize]
    }];
}
 

此方法的几乎的工作。这里有两个问题：

1. 我设置的占位符。然而宽的占位符是，所述的UITextField的intrinsicContentSize的宽度决不会低于它。所以，如果占位符的宽度是130，我开始键入，文本视图的宽度将保持在130到什么我打字达到的宽度比130越大;在此之后的文本视图将增长。




2. 在我的例子中，我已经放在下面的UITextField一个UITextView。当我在键入的UITextField，其宽度的增长预期。那么我可以挖掘到的UITextView和编辑文本。如果我再回去和编辑的UITextView，它的宽度不再增长/收缩预期。该值被从被标准的前瞻性整数像 {192，28} ，到 {191.536，27.959999} 。




任何帮助将是AP preciated！

解决方案

  

我设置的占位符。然而宽的占位符是，所述的UITextField的intrinsicContentSize的宽度决不会低于它。所以，如果占位符的宽度是130，我开始键入，文本视图的宽度将保持在130到什么我打字达到的宽度比130越大;在此之后的文本视图将增长。

我认为你将不得不使用一个子类的UITextField，其中的您的获取将 instrinsicContentSize ，覆盖的默认行为 intrinsicContentSize 方法，它显然是大小根据占位符。

An example project to demonstrate the below issue can be found here: https://github.com/markdorison/UITextFieldContentSizeExample/

I am attempting to have a UITextField grow/shrink its width with the text content it contains using Auto Layout. I have created leading and trailing constraints with a priority of 749 (as opposed to the default: 1000). I have also tried lowering the priority of these constraints all the way down to 1, but this does not seem to have a noticeable effect on the behavior.

By listening to the UIControlEventEditingChanged event, I am triggering a reset of the intrinsicContentSize:

- (IBAction)textFieldDidChange:(UITextField *)textField {
    [UIView animateWithDuration:0.1 animations: ^{
        [textField invalidateIntrinsicContentSize];
    }];
}

This approach almost works. There are two issues:

1. I am setting a placeholder. However wide the placeholder is, the width of the UITextField's intrinsicContentSize will never drop below it. So if the placeholder's width is 130, and I begin to type, the text view's width will remain at 130 until what I am typing reaches a width greater than 130; after this the text view will grow.

2. In my example I have placed a UITextView below the UITextField. When I type in the UITextField, its width grows as expected. I can then tap into the UITextView and edit the text. If I then go back and edit the UITextView, its width no longer grows/shrinks as expected. The values being returned by the UITextField's intrinsicContentSize property go from being standard-looking integers like {192, 28}, to {191.536, 27.959999}.

Any help would be appreciated!

解决方案

I am setting a placeholder. However wide the placeholder is, the width of the UITextField's intrinsicContentSize will never drop below it. So if the placeholder's width is 130, and I begin to type, the text view's width will remain at 130 until what I am typing reaches a width greater than 130; after this the text view will grow.

I think you'll have to use a UITextField subclass where you get to set the instrinsicContentSize, overriding the default behavior of the intrinsicContentSize method which is evidently to size based on the placeholder.

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