在我的View Controller中，我有一个集合视图，在渲染时会显示3个单元格，每个单元格都有一个标签和一个按钮。标签显示颜色的名称，按钮具有显示颜色样本的背景图像。
我想要它，以便每当你点击其中一个按钮时，该按钮会在它周围形成一个黑色边框，而其他按钮上有一个亮边框，表示点击按钮被“选中”。或者，我可以通过根据图像的选定状态更改图像来实现此目的 - 但我的问题仍然是相同的。
如何访问其他两个按钮，以切换其属性？
我有一个实现的脚本，允许我为有人点击的按钮添加边框 - 但我无法弄清楚如何访问其他按钮，在CollectionView的其他单元格中也改变它们的边框属性。
这是我的源代码（删除了不相关/不相关的位）
class trimSelectorVC: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
@IBOutlet weak var trimSelector: UICollectionView!
struct trimObject {
var trimName: String
var trimButton: String
var trimID: Int
}
var trimArray: [trimObject] = []
override func viewDidLoad() {
super.viewDidLoad()
trimArray.append(trimObject(trimName: "Chrome", trimButton: "chrome-swatch", trimID: 0))
trimArray.append(trimObject(trimName: "Gold", trimButton: "gold-swatch", trimID: 1))
trimArray.append(trimObject(trimName: "Gun Metal", trimButton: "gunmetal-swatch", trimID: 2))
trimSelector.delegate = self
trimSelector.dataSource = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return trimArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! trimSelectionCell
//Set the label text
cell.trimLabel.text = trimArray[indexPath.item].trimName
//Set the image for the button
cell.trimButton.setImage(UIImage(named: trimArray[indexPath.item].trimButton), for: UIControlState.normal)
//Sets a target function for the button
cell.trimButton.addTarget(self, action: #selector(selectedSwatch), for: .touchUpInside)
return cell
}
func selectedSwatch(sender: UIButton) {
//These set the "selected" border to the button you clicked on.
sender.layer.borderWidth = 2
sender.layer.borderColor = UIColor(red: 83/255, green: 71/255, blue: 65/255, alpha: 1.00).cgColor
}
}
有人可以告诉我如何访问我的“selectedSwatch”功能中的其他按钮吗？
有多种方法可以解决这个问题。 UICollectionView视图有一个方法visibleCells()返回它的可见单元格的数组。您可以使用它来获取指向您的单元格的指针。您需要一种方法来确定哪一个是哪个。例如，您可以使用indexPath(for: UICollectionViewCell)来计算每个单元格的索引路径。
我不知道这是否有帮助，但如果将indexPath存储在cellForItemAt方法的结构上呢？
你将会有：
struct trimObject {
var trimName: String
var trimButton: String
var trimID: Int
var idx : IndexPath
}
然后：
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! trimSelectionCell
....
trimArray[indexPath.item].idx = indexPath
....
}
在您的selectedSwatch方法中：
func selectedSwatch(sender: UIButton) {
//These set the "selected" border to the button you clicked on.
sender.layer.borderWidth = 2
sender.layer.borderColor = UIColor(red: 83/255, green: 71/255, blue: 65/255, alpha: 1.00).cgColor
if let cell = (sender.superview as? UICollectionViewCell) {
//Cell with the button selected:
let idx = collectionView.indexPath(for: cell)
//array of the other objects:
let allOtherObjects = trimArray.filter { ($0 as! trimObject).idx != idx }
allOtherObject.forEach({ (trimObj) in
let cell = collection.cellForItem(at: trimObj.idx)
//Do whatever yo need to do...
//cell.trimButton.layer
})
}
}
它可能会迟到但对Swift 4版本的某些人仍然有用：你可以使用发送者superview作为UiCollectionViewCell *考虑集合视图单元格中的发送者层次结构
func selectedSwatch(sender: UIButton) {
let cell = sender.superview?.superview as! trimSelectionCell
//cell.yourbtn
}
试试这个，
class trimSelectorVC: UIViewController, UICollectionViewDelegate,
UICollectionViewDataSource {
@IBOutlet weak var trimSelector: UICollectionView!
struct trimObject {
var trimName: String
var trimButton: String
var trimID: Int
var isSelected : String
}
var trimArray: [trimObject] = []
override func viewDidLoad() {
super.viewDidLoad()
trimArray.append(trimObject(trimName: "Chrome", trimButton: "chrome-swatch", trimID: 0,isSelected : "0"))
trimArray.append(trimObject(trimName: "Gold", trimButton: "gold-swatch", trimID: 1,isSelected : "0"))
trimArray.append(trimObject(trimName: "Gun Metal", trimButton: "gunmetal-swatch", trimID: 2,isSelected : "0"))
trimSelector.delegate = self
trimSelector.dataSource = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return trimArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! trimSelectionCell
//Set the label text
cell.trimLabel.text = trimArray[indexPath.item].trimName
//Set the image for the button
cell.trimButton.setImage(UIImage(named:
trimArray[indexPath.item].trimButton), for: UIControlState.normal)
if(trimArray[indexPath.item].isSelected == "0"){
// button not clicked
// change shadow color of button
}
else
{
// button clicked
cell.trimButton.layer.borderWidth = 2
cell.trimButton.layer.borderColor = UIColor(red: 83/255, green:
71/255,blue: 65/255, alpha: 1.00).cgColor
}
// set tag to the button
cell.trimButton.tag = indexPath.item
//Sets a target function for the button
cell.trimButton.addTarget(self, action:#selector(selectedSwatch),
for: .touchUpInside)
return cell
}
func selectedSwatch(sender: UIButton) {
//These set the "selected" border to the button you clicked on.
let index = sender.tag
for obj in trimArray {
obj.isSelected = "0"
}
trimArray[index].isSelected = "1"
collectionView.reloadData()
}
}