我有一个用于聊天页面的collectionView。我创建了一个名为TextChatCollectionViewCell
的UICollectionViewCell
子类。
我还有另一个类来填充我的collectionView并为每个项目指定CGSize
(遵循UICollectionViewDelegateFlowLayout
和UICollectionViewDataSource
协议)。
当我滚动时,单元格框架大小是正确的,但子视图的框架大小是错误的,这可能是因为dequeueReusableCell
返回另一个单元格的实例,并且子视图没有重新加载。我尝试调用layoutIfNeeded()
以强制布局重新绘制子视图,但它没有任何效果。
我的带约束条件的单元格xib文件如下:
我的填充和返回单元格的代码如下:
public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = self.manager.collectionView.dequeueReusableCell(withReuseIdentifier: "TextChatCollectionViewCell", for: indexPath) as? TextChatCollectionViewCell else {
return UICollectionViewCell()
}
self.fillCellUsingMessageUUID(cell, self.messagesUUIDs[indexPath.row]) // Hide labelDate (set height to 0 for the moment), fill UITextView etc...
print("=================\(self.messagesUUIDs[indexPath.row])===================")
print("Cell text : " + cell.textMessage.text)
print("Cell frame size : " + cell.frame.size.debugDescription)
print("UITextView frame size : " + cell.textMessage.frame.size.debugDescription)
print("UITextView parent size : " + cell.textBackgroundView.frame.size.debugDescription)
print("Cell content view frame size : " + cell.globalView.frame.size.debugDescription)
print("====================================")
return cell
}
我的调试输出:
=================B00C74D6-C3F1-4039-948B-0BAC59DC0D83===================
Cell text : "Ggg"
Cell frame size : (320.0, 80.0) // Expected size
UITextView frame size : (240.0, 59.5) // Wrong height
UITextView parent size : (240.0, 59.5) // Wrong height
Cell content view frame size : (320.0, 59.5) // Wrong height
====================================
=================2704FFF5-17D1-4E0E-9399-DD7EB4C60D36===================
Cell text : "Zyehdhzhdhdhzhejajeksvshdjajdjhhhjhhjjhhhhthhytgjuhjjyghjuyghhuygghuutghjutghkiygvcwqazdxcfeerggvbhtyjjnkkuilloomppolpôkkjjîîîukhgkurghhhhhgoohgosohsohdohsohsohshowlhdlhslhslhsglslydlgsotwyod [...]"
Cell frame size : (320.0, 411.5) // Expected size
UITextView frame size : (240.0, 59.5) // Wrong height
UITextView parent size : (240.0, 59.5) // Wrong height
Cell content view frame size : (320.0, 59.5) // Wrong height
期望输出:
=================B00C74D6-C3F1-4039-948B-0BAC59DC0D83===================
Cell text : "Ggg"
Cell frame size : (320.0, 80.0)
UITextView frame size : (240.0, 80.0)
UITextView parent size : (240.0, 80.0)
Cell content view frame size : (320.0, 80.0)
====================================
=================2704FFF5-17D1-4E0E-9399-DD7EB4C60D36===================
Cell text : "Zyehdhzhdhdhzhejajeksvshdjajdjhhhjhhjjhhhhthhytgjuhjjyghjuyghhuygghuutghjutghkiygvcwqazdxcfeerggvbhtyjjnkkuilloomppolpôkkjjîîîukhgkurghhhhhgoohgosohsohdohsohsohshowlhdlhslhslhsglslydlgsotwyod [...]"
Cell frame size : (320.0, 411.5)
UITextView frame size : (240.0, 411.5)
UITextView parent size : (240.0, 411.5)
Cell content view frame size : (320.0, 411.5)
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
,但我没有显式地重置大小。 - Dany SousalayoutSubviews
。 - Annie GuptalayoutSubviews
并没有解决这个问题。 - Dany Sousa