ios - 第一个矩形(对于 :) returns wrong value in UITextField
<p><p>我正在尝试使用语法高亮来标记用户输入的错误。 </p>
<p>遵循 <a href="https://stackoverflow.com/questions/11486072/get-x-and-y-coordinates-of-a-word-in-uitextview" rel="noreferrer noopener nofollow">Get X and Y coordinates of a word in UITextView</a> 中的建议我的代码非常适合 UITextView</p>
<p>但是，我现在正在尝试为 UITextField 做类似的事情并且遇到了麻烦。</p>
<p>UITextField 和 UITextView 都符合 UITextInput 并且定位矩形所需的所有方法都适用于两者。</p>
<p>这是 UITextView 的函数</p>
<pre><code>func findRect(forTextMatching match:String, in textView:UITextView) -> CGRect? {
if let text = textView.text,
let range = text.range(of: match)
{
let offset1 = text.distance(from: text.startIndex, to: range.lowerBound)
let offset2 = text.distance(from: text.startIndex, to: range.upperBound)
if let pos1 = textView.position(from: textView.beginningOfDocument, offset: offset1),
let pos2 = textView.position(from: textView.beginningOfDocument, offset: offset2)
{
if let textRange = textView.textRange(from: pos1, to: pos2)
{
textView.selectedTextRange = textRange
let rect = textView.firstRect(for: textRange)
return rect
}
}
}
return nil
}
</code></pre>
<p>在测试应用程序中运行它并突出显示返回的矩形，如下所示:</p>
<p> <a href="/image/jRJvt.png" rel="noreferrer noopener nofollow"><img src="/image/jRJvt.png" alt="enter image description here"/></a> </p>
<p>现在尝试用 UITextField 做同样的事情:</p>
<pre><code>func findRect(forTextMatching match:String, in textField:UITextField) -> CGRect? {
if let text = textField.text,
let range = text.range(of: match)
{
let offset1 = text.distance(from: text.startIndex, to: range.lowerBound)
let offset2 = text.distance(from: text.startIndex, to: range.upperBound)
// beginningOfDocument is nil unless textField is first responder
textField.becomeFirstResponder()
defer {
textField.resignFirstResponder()
}
if let pos1 = textField.position(from: textField.beginningOfDocument, offset: offset1),
let pos2 = textField.position(from: textField.beginningOfDocument, offset: offset2)
{
if let textRange = textField.textRange(from: pos1, to: pos2)
{
textField.selectedTextRange = textRange
var rect = textField.firstRect(for: textRange)
return rect
}
}
}
return nil
}
</code></pre>
<p>第一个问题是 UITextField.beginningOfDocument 为 nil，除非该字段是第一响应者。这很容易处理，因此额外的行变成了 becomeFirstResonder 和 resignFirstResponder。</p>
<p>在测试应用程序中运行它并突出显示返回的矩形，如下所示:</p>
<p> <a href="/image/Wq4KQ.png" rel="noreferrer noopener nofollow"><img src="/image/Wq4KQ.png" alt="enter image description here"/></a> </p>
<p>返回的矩形略有偏移。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>这似乎是 UITextField 的一个错误。在调试中检查 View 层次结构，在 UITextField 下有一个额外的 View ，类型为 UIFieldEditor，具有框架原点 (7,4)。返回的 rect 似乎与此 View 相关，而不是 UITextField。</p>
<p>原来你可以作为 UITextField 的 editRect 来访问这个框架。</p>
<p>UITextField 的修改函数:</p>
<pre><code>func findRect(forTextMatching match:String, in textField:UITextField) -> CGRect? {
if let text = textField.text,
let range = text.range(of: match)
{
let offset1 = text.distance(from: text.startIndex, to: range.lowerBound)
let offset2 = text.distance(from: text.startIndex, to: range.upperBound)
// beginningOfDocument is nil unless textField is first responder
textField.becomeFirstResponder()
defer {
textField.resignFirstResponder()
}
if let pos1 = textField.position(from: textField.beginningOfDocument, offset: offset1),
let pos2 = textField.position(from: textField.beginningOfDocument, offset: offset2)
{
if let textRange = textField.textRange(from: pos1, to: pos2)
{
var rect = textField.firstRect(for: textRange)
// firstRect is actually relative to editingRect, not textField
let top = textField.editingRect(forBounds: textField.bounds).origin.y
let left = textField.editingRect(forBounds: textField.bounds).origin.x
rect = CGRect(x: rect.origin.x+left, y: rect.origin.y+top, width: rect.width, height: rect.height)
return rect
}
}
}
return nil
}
</code></pre>
<p>产生正确的结果:</p>
<p> <a href="/image/BXPmK.png" rel="noreferrer noopener nofollow"><img src="/image/BXPmK.png" alt="enter image description here"/></a> </p></p>
<p style="font-size: 20px;">关于ios - 第一个矩形(对于 :) returns wrong value in UITextField，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/45910145/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/45910145/
</a>
</p>
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