我是一个新的iOS程序。现在,我通过不使用storyboard
来创建示例应用程序,我对滚动方向是垂直的主类实现了UICollectionView
。我为一个特定的单元格添加了另一个UICollectionView
用于水平方向。问题是cell
的水平滚动方向没有推到我单击的另一个视图控制器上。
这是我在rootViewController
中设置的AppDelegate
window = UIWindow(frame: UIScreen.main.bounds)
window?.makeKeyAndVisible()
let navigation = UINavigationController(rootViewController: CategoryController())
window?.rootViewController = navigation
这里是CategoryController
,我实现了tableView
tableView.register(TableCell.self, forCellReuseIdentifier: cellId)
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 5
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
return cell
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 120
}
对于tableView
,当我想导航到特定控制器时,单击特定单元格可以正常工作
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print(indexPath.item)
let view = DetailEachCellController()
navigationController?.pushViewController(view, animated: true)
}
问题在于,在DetailEachCellController
中,我使用UICollectionView
列出了一些数据,当我单击特定的单元格时,并没有导航到新的控制器
这里DetailEachCellController
为UIViewController
var collectionDetailView: UICollectionView!
collectionDetailView.register(DetailContactCell.self, forCellWithReuseIdentifier: cellIdContact)
collectionDetailView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: cellIdContent)
func setupCollectionView() {
collectionDetailView.topAnchor.constraint(equalTo: detailContent.topAnchor).isActive = true
collectionDetailView.widthAnchor.constraint(equalTo: detailContent.widthAnchor).isActive = true
collectionDetailView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
collectionDetailView.backgroundColor = .white
}
func callAction() {
print("pushing view")
let view = UIViewController()
self.navigationController?.pushViewController(view, animated: true)
}
这里是UICollectionViewFlowLayout
的代表
extension DetailEachCellController : UICollectionViewDelegateFlowLayout, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.item == 0 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdContact, for: indexPath)
return cell
}
else {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdContent, for: indexPath)
cell.backgroundColor = .blue
return cell
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if indexPath.item == 1 {
return CGSize(width: view.frame.width, height: 250)
}
return CGSize(width: view.frame.width, height: 120)
}
}
这里是DetailContactCell
,我添加了一些按钮以供用户单击,并在下一个视图中添加了更多按钮,但它没有移动,但调用了该函数。
class DetailContactCell: UICollectionViewCell {
var eachCellController: DetailEachCellController?
lazy var callButton: UIButton = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.layer.shadowOpacity = 0.25
button.backgroundColor = .white
button.setTitle("CALL", for: .normal)
button.layer.cornerRadius = 10
button.layer.shadowOffset = CGSize(width: 0, height: 10)
button.layer.shadowRadius = 10
return button
}()
lazy var bookButton: UIButton = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.layer.shadowOpacity = 0.25
button.backgroundColor = .white
button.layer.cornerRadius = 10
button.layer.shadowOffset = CGSize(width: 0, height: 10)
button.layer.shadowRadius = 10
return button
}()
override init(frame: CGRect) {
super.init(frame: frame)
addSubview(callButton)
addSubview(bookButton)
callButton.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
callButton.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 15).isActive = true
callButton.widthAnchor.constraint(equalTo: self.widthAnchor, multiplier: 1/2.5).isActive = true
callButton.heightAnchor.constraint(equalToConstant: 60).isActive = true
bookButton.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
bookButton.rightAnchor.constraint(equalTo: self.rightAnchor, constant: -15).isActive = true
bookButton.widthAnchor.constraint(equalTo: self.widthAnchor, multiplier: 1/2.5).isActive = true
bookButton.heightAnchor.constraint(equalToConstant: 60).isActive = true
self.actionButton()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func actionButton() {
callButton.addTarget(self, action: #selector(callBtn), for: .touchUpInside)
}
@objc func callBtn() {
print("calling")
eachCellController = DetailEachCellController()
eachCellController?.callAction()
}
}
答案 0 :(得分:3)
因为这个
// eachCellController = DetailEachCellController()//对其进行注释
是另一个VC而不是一个
eachCellController?.callAction()
您需要使用cellForItemAt
cell.eachCellController = self
//
@objc func callBtn() {
print("calling")
eachCellController?.callAction()
}
答案 1 :(得分:2)
您不能从UICollectionViewCell
类内部将新的视图控制器推入导航控制器堆栈。
这样做的方法是(通过委托方法或回调处理程序)告诉DetailEachCellController
单击了按钮,然后 ONLY FROM DetailEachCellController
推视图控制器。
答案 2 :(得分:2)
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.item == 0 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdContact, for: indexPath) as! DetailContactCell
// Here is line add to `UICollectionViewFlowLayout`
cell.eachCellController = self
return cell
}else {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdContent, for: indexPath)
cell.backgroundColor = .blue
return cell
}
}
答案 3 :(得分:1)
将UIViewController
的强对象传递到单元格不是方便的方法。您可能会创建保留周期,并且视图控制器将不会像内存一样被释放,因此将来可能会导致内存问题
要解决此问题,您可能有以下选择
addTarget
在视图控制器本身中执行按钮动作由于闭包选项很容易,我在此举一个示例来实现它。
在集合视图单元格中,添加以下属性
var callBtnTapped : (() -> ())?
现在进入。
@objc func callBtn() {
print("calling")
// Check that target has implemented closure ?
if let clouser = self.callBtnTapped {
clouser(screenShotID)
}
}
在您的视图控制器cellForItem
中,将主体添加到闭包
cell.callBtnTapped = {[weak self] in
guard let strongSelf = self else {return}
strongSelf. callAction()
// It will be called when button tapped
}
希望对您有帮助