我对 segues 或我的文本视图有问题。有两个视图控制器:ViewController 和 TextViewController。两个视图控制器都显示一个UITextView和一个按钮。我创建了一个名为"textSegue"的segue,当我按下ViewController上的"文本"按钮时,文本将传递到TextViewController并显示。在文本视图控制器上,我可以选择文本并按"粗体"按钮使文本加粗。当我按下"返回"按钮时,文本视图控制器被关闭,视图控制器将显示属性文本。问题是,当我再次按下"文本"按钮并且文本视图控制器显示时,UITextView 中的文本不显示属性文本(它不再是粗体)。
我认为 segue 确实正确传递了属性文本,但不知何故文本视图无法正确显示它。有谁知道我做错了什么吗?
视图控制器:
import UIKit
class ViewController: UIViewController, TextViewControllerDelegate {
var newtext = NSAttributedString()
@IBOutlet var textView: UITextView!
@IBAction func btnText(sender: AnyObject) {
self.performSegueWithIdentifier("textSegue", sender: nil)
newtext = textView.attributedText
print("viewcontroller btnText pressed")
print("newtext :", newtext)
}
@IBAction func btnLocation(sender: AnyObject) {
}
override func viewDidLoad() {
super.viewDidLoad()
newtext = textView.attributedText
print("ViewController ViewDidLoad")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "textSegue"{
let vc = segue.destinationViewController as! TextViewController
vc.myString = newtext
vc.delegate = self
print("open Textview:")
print(newtext)
}
}
func setText(controller: TextViewController, nieuwetext: NSAttributedString) {
newtext = nieuwetext
print("Segue ontvangen1: ", newtext)
textView.attributedText = newtext
controller.navigationController?.popViewControllerAnimated(true)
}
}
文本视图控制器:
import UIKit
protocol TextViewControllerDelegate {
func setText(controller: TextViewController, nieuwetext: NSAttributedString);
}
class TextViewController: UIViewController {
var delegate : TextViewControllerDelegate! = nil
var myString = NSAttributedString(string: "")
@IBOutlet var textView: UITextView!
@IBAction func btnTextBack(sender: AnyObject) {
myString = textView.attributedText
print("textview btnTextBack pressed: ")
print(myString)
if (delegate != nil) {
delegate!.setText(self, nieuwetext: myString)
}
dismissViewControllerAnimated(true, completion:nil)
}
@IBAction func btnBold(sender: AnyObject) {
textView.toggleBoldface(self)
}
override func viewDidLoad() {
super.viewDidLoad()
textView.attributedText = myString
print("textView viewDidLoad")
print("myString: ", myString)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
我添加了
textView.attributedText = myString
到ViewDidAppear(所以现在它在ViewDidAppear和ViewDidLoad中)。在ViewDidLoad中,它似乎没有加载属性,但在ViewDidAppear中它确实加载了属性。
也许是错误?