我使用 collectionViewController 作为用户提交表单，有两个部分：
每个部分都有一个自定义类，其中包含相关数据，基于用户信息，有4个项目可供选择。在didSelectItemAtIndexPath上，用户突出显示最符合其条件的单元格。我有一个按钮，其目标是将用户选择的单元格上传到我的云后端。这些信息来自collectionView?.indexPathsForSelectedItems()，因为我创建了一系列单元格＆＃39;用户已选择的indexPaths，每个部分可能只有一个选定的行。我已经完成了提交的每个组合，并且只有当用户提交第0项第0项和第1项第3项时，它才能为第一部分的选择注册正确的单元格。当我断开相关的行时，我能够获得用户在这种情况下选择的单元格信息，但是否则它会为我的collectionview单元格返回nil，并且不允许我拉出正确的单元格标记。
//within my didSelectItemAtIndexPath
//I am properly adding and removing indexPaths..can add the code in if needed
selectItems = self.collectionView?.indexPathsForSelectedItems()//indexPath array
//my button controlling the submission of data
bottomView.anchorButton.addTarget(self, action: #selector(postItems), forControlEvents: .TouchUpInside)
//target method
我正在尝试将单元格标记传递到我的数据库中，并且每个部分都是唯一的
func postItems() {
let indexPath1 = selectItems
var lTag: Int?
var pTag: Int?
if let indexPath = indexPath1 {
//I have printed the selected indexPath to make sure I am passing the right values
// when only the mandatory section is returned, there isnt a problem
//returning the cell type that I want and the cell returns the value I want
if indexPath.count == 1 {
if indexPath[0].section == 0 {
if let customCell = collectionView?.cellForItemAtIndexPath(indexPath[0]) {
let cell = customCell as! CustomCell1
lTag = cell.tag
}
} else if indexPath[0].section == 1 {
if let customCell2 = collectionView?.cellForItemAtIndexPath(indexPath[0]) {
let cell2 = customCell2 as! CustomCell2
pTag = cell2.tag
}
}
}
//the problem occurs when I have my optional section included
if indexPath.count == 2 {
//the problem occurs here..can not unwrap the cell for this indexPath (0-0)
//but will do so when in a breakpoint..does not have a problem for
other combinations (e.g. 0-0 and 1-0/1-1/1-2)
if indexPath[0].section == 0 {
if let customCell = collectionView?.cellForItemAtIndexPath(indexPath[0]) {
let cell = customCell as! CustomCell
lTag = cell.tag
}
} else if indexPath[0].section == 1 {
if let customCell2 = collectionView?.cellForItemAtIndexPath(indexPath[0]) {
let cell2 = customCell2 as! CustomCell2
pTag = cell2.tag
}
}
if indexPath[1].section == 0 {
if let customCell = collectionView?.cellForItemAtIndexPath(indexPath[1]) {
let cell = customCell as! CustomCell
lTag = cell.tag
}
} else if indexPath[1].section == 1 {
if let customCell2 = collectionView?.cellForItemAtIndexPath(indexPath[1]) {
let cell2 = customCell2 as! CustomCell2
pTag = cell2.tag
}
}
}
}
if lTag != nil {
print("Tag isn't nil")
} else {
print("Tag is nil because cell is nil value and could not be unwrapped")
}
}
结尾仅用于测试是否已为问题标记分配值。我不确定是否有更好的方法来检查是否根据其部分选择了多个indexPath，但在我发现此错误之前，我认为这个代码可以做到。
当选择0-0和0-0时，单元格是否仅在1-3返回nil是有原因的。有时，单元格会打开并取出我的自定义单元格的值，但大多数情况下它不会。“/ p>