使用自动布局使用文本水平调整UITextField的大小 [英] Resize UITextField horizontally with text using Auto Layout
问题描述
以下是可演示以下问题的示例项目： https://github.com/markdorison / UITextFieldContentSizeExample /
An example project to demonstrate the below issue can be found here: https://github.com/markdorison/UITextFieldContentSizeExample/
我试图有一个UITextField增加/收缩其宽度与它包含使用自动布局的文本内容。我已经创建了前导和尾随约束，优先级为749（而不是默认值：1000）。我也尝试将这些约束的优先级降低到1，但这似乎没有对行为有显着的影响。
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.
通过侦听UIControlEventEditingChanged事件，我触发了重置intrinsicContentSize：
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];
}];
}
这种方法几乎起作用。有两个问题：
This approach almost works. There are two issues:
-
我设置了一个占位符。不管宽度占位符是多少，UITextField的intrinsicContentSize的宽度将永远不会低于它。因此，如果占位符的宽度为130，并且我开始键入，文本视图的宽度将保持在130，直到我正在输入的宽度大于130;
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.
在我的示例中，我在UITextField下放置了一个UITextView。当我在UITextField中输入时，其宽度按预期增长。然后我可以点击进入UITextView并编辑文本。如果我回去编辑UITextView，它的宽度不再像预期的那样增长/收缩。 UITextField的intrinsicContentSize属性返回的值从 {192，28} 等标准整型变为 {191.536，27.959999} code>。
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}.
任何帮助将不胜感激。
推荐答案
我设置了一个占位符。不管宽度占位符是多少，UITextField的intrinsicContentSize的宽度将永远不会低于它。因此，如果占位符的宽度为130，并且我开始键入，文本视图的宽度将保持在130，直到我正在输入的宽度大于130;
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.
我想你必须使用UITextField子类， >获取设置 instrinsicContentSize ，覆盖 intrinsicContentSize 方法的默认行为，这显然是基于占位符。
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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