我正在尝试实现多页文本编辑布局,如 Pages、MS Word、...。在 OS XI 上,可以通过为多个 NSTextView 创建一个 NSLayoutManager 和一个 NSTextStorage 来实现这一点。每个 NSTextView 都有自己的 NSTextContainer。请参阅下面的 OS X 代码。一个在两个 NSTextView 之间传播文本的简单示例:
import Cocoa
class ViewController: NSViewController {
let layoutManager = NSLayoutManager()
let textStorage = NSTextStorage(attributedString: NSAttributedString(string: "This is a test"))
let textContainer1 = NSTextContainer()
let textContainer2 = NSTextContainer()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
textStorage.addLayoutManager(layoutManager)
textContainer1.widthTracksTextView = true
textContainer1.heightTracksTextView = true
textContainer2.widthTracksTextView = true
textContainer2.heightTracksTextView = true
let textView1 = NSTextView(frame: CGRectMake(0, 100, 100, 100), textContainer: textContainer1)
textView1.backgroundColor = NSColor.greenColor()
self.view.addSubview(textView1)
layoutManager.addTextContainer(textContainer1)
let textView2 = NSTextView(frame: CGRectMake(200, 100, 100, 100), textContainer: textContainer2)
textView2.backgroundColor = NSColor.greenColor()
self.view.addSubview(textView2)
layoutManager.addTextContainer(textContainer2)
}
}
这行得通。
但是,当我尝试在 iOS 上使用 UITextView 执行相同操作时,UITextViews 变得不可选择或不可编辑。请参阅我的 iOS 代码:
import UIKit
class ViewController: UIViewController, UITextViewDelegate {
let layoutManager = NSLayoutManager()
let textStorage = NSTextStorage(attributedString: NSAttributedString(string: "This is a test. This text should spread over two UITextViews. Bla bla bla bla bla bla bla bla bla bla bla bla bla"))
let textContainer1 = NSTextContainer()
let textContainer2 = NSTextContainer()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
textStorage.addLayoutManager(layoutManager)
textContainer1.heightTracksTextView = true
textContainer1.widthTracksTextView = true
textContainer2.heightTracksTextView = true
textContainer2.widthTracksTextView = true
let textView1 = UITextView(frame: CGRectMake(0, 100, 100, 100), textContainer: textContainer1)
textView1.scrollEnabled = false
textView1.delegate = self
textView1.editable = true
textView1.selectable = true
textView1.backgroundColor = UIColor.greenColor()
self.view.addSubview(textView1)
layoutManager.addTextContainer(textContainer1)
let textView2 = UITextView(frame: CGRectMake(200, 100, 100, 100), textContainer: textContainer2)
textView2.scrollEnabled = false
textView2.delegate = self
textView2.editable = true
textView2.selectable = true
textView2.backgroundColor = UIColor.greenColor()
self.view.addSubview(textView2)
layoutManager.addTextContainer(textContainer2)
}
}
文本从一个 UITextView 流向另一个,但不可编辑。我将非常感谢任何建议。我用谷歌搜索了这个问题,发现其他人也遇到了同样的问题,但没有找到解决方案。