ios 根据内容调整 textField 的大小
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Resize textField Based On Content
提问by Michael Voccola
How can a textField be resized based on content while using auto-layout in an iOS application written in Swift?
在用 Swift 编写的 iOS 应用程序中使用自动布局时，如何根据内容调整 textField 的大小？
The text field will resize as necessary to fit its content when the view loads as well as while the user is typing.
当视图加载以及用户输入时，文本字段将根据需要调整大小以适应其内容。
Ideally, the text field would stop resizing at a certain point, say, 6 lines, and become scrollable.
理想情况下，文本字段将在某个点停止调整大小，例如 6 行，并变为可滚动。
回答by Christian
You have to use an UITextViewinstead of an UITextField.
您必须使用 anUITextView而不是UITextField。
Then, you can use the sizeThatFitsmethod.
然后，您可以使用该sizeThatFits方法。
But first you have to know how high one line will be. You can get that information by using lineHeight:
但首先你必须知道一条线有多高。您可以使用lineHeight以下方法获取该信息：
var amountOfLinesToBeShown: CGFloat = 6
var maxHeight: CGFloat = yourTextview.font.lineHeight * amountOfLinesToBeShown
After that, just call the sizeThatFitsmethod inside your viewDidLoadmethod and set the maxHeight (line * 6) as your textview height:
之后，只需sizeThatFits在您的viewDidLoad方法中调用该方法并将 maxHeight ( line * 6)设置为您的文本视图高度：
yourTextview.sizeThatFits(CGSizeMake(yourTextview.frame.size.width, maxHeight))
回答by user44776
Swift 3
斯威夫特 3
var textView : UITextView!
override func viewDidLoad() {
super.viewDidLoad()
textView = UITextView()
textView.sizeThatFits(CGSize(width: textView.frame.size.width, height: textView.frame.size.height))
}
