ios - 使用 XMSegmentedControl 更改了 TableViewCell
<p><p>我想用 XMSegmentedControl(<a href="https://github.com/xaviermerino/XMSegmentedControl" rel="noreferrer noopener nofollow">https://github.com/xaviermerino/XMSegmentedControl</a>) 更改 tableviewcell 的数据，
我在 </p> 中使用 switch
<pre><code>func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
</code></pre>
<p>，但它总是打印出来的</p>
<pre><code>fatal error: unexpectedly found nil while unwrapping an Optional value**,and say *segmentedControl1 is nil.
</code></pre>
<hr/>
<pre><code>let tin = ["1","2","3","4"]
let how = ["one","two","three","four"]
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var segmentedControl1: XMSegmentedControl!
override func viewDidLoad() {
super.viewDidLoad()
let segmentedControl3 = XMSegmentedControl(frame: CGRect(x: 0, y: 70, width: self.view.frame.width, height: 44), segmentTitle: ["Hello", "World", "Three"], selectedItemHighlightStyle: XMSelectedItemHighlightStyle.topEdge)
segmentedControl3.backgroundColor = UIColor(red: 22/255, green: 150/255, blue: 122/255, alpha: 1)
segmentedControl3.highlightColor = UIColor(red: 25/255, green: 180/255, blue: 145/255, alpha: 1)
segmentedControl3.tint = UIColor.white
segmentedControl3.highlightTint = UIColor.black
self.view.addSubview(segmentedControl3)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
var returnValue = 0
switch(segmentedControl1.selectedSegment)
{
case 0 :
returnValue = tin.count
case 1 :
returnValue = how.count
default :
break
}
return returnValue
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
switch(segmentedControl1.selectedSegment)
{
case 0 :
cell.textLabel?.text = tin
case 1 :
cell.textLabel?.text = how
default :
break
}
return cell
}
</code></pre>
<p>谁能帮我解决这个问题？</p>
<p>谢谢!</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>用我的代码替换您的 <code>viewDidLoad()</code>。 </p>
<pre><code>override func viewDidLoad() {
super.viewDidLoad()
segmentedControl1 = XMSegmentedControl(frame: CGRect(x: 0, y: 70, width: self.view.frame.width, height: 44), segmentTitle: ["Hello", "World", "Three"], selectedItemHighlightStyle: XMSelectedItemHighlightStyle.topEdge)
segmentedControl1.backgroundColor = UIColor(red: 22/255, green: 150/255, blue: 122/255, alpha: 1)
segmentedControl1.highlightColor = UIColor(red: 25/255, green: 180/255, blue: 145/255, alpha: 1)
segmentedControl1.tint = UIColor.white
segmentedControl1.highlightTint = UIColor.black
self.view.addSubview(segmentedControl1)
}
</code></pre>
<p>放入segmentControl的valuechenged方法</p>
<pre><code>DispatchQueue.main.async{
self.ttblView.reloadData()
}
</code></pre>
<p>您应用了错误的 segmentControl 。你把值放在 segmentedControl3 中，所以 segmentedControl1 给出 nil 。</p></p>
<p style="font-size: 20px;">关于ios - 使用 XMSegmentedControl 更改了 TableViewCell，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/43292453/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/43292453/
</a>
</p>
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