我有两个viewController' s。第一个VC在collectionCell
内有tableCell
。第二个VC有collectionCell
,我有快速File
,而Model有一个类。我需要将数据从第一个VC(collectionCell
)传递到第二个VC。
从collectionCell
传递数据需要因为collectionCell
有图像(来自swift文件 - 模型)。我认为需要使用协议,但我真的不懂如何使用协议。请帮忙。
我的代码:
1stVC (适用的的viewController ):
class ViewController1: UIViewController {
@IBOutlet weak var tableView: UITableView!
var image: [Model] = []
var ref: FIRDatabaseReference!
override func viewDidLoad() {
super.viewDidLoad()
ref = FIRDatabase.database().reference(withPath: "Студии2")
ref.observe(.value, with: { (snapshot) in
var newImages: [Model] = []
for item in snapshot.children {
let object = Model(snapshot: item as! FIRDataSnapshot)
newImages.append(object)
}
self.image = newImages
self.tableView.reloadData()
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
extension ViewController1: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return image.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TableViewCell1
cell.images = [image[indexPath.row].image,
image[indexPath.row].image2]
return cell
}
}
1stVC ( tableCell内的collectionCell ):
protocol PostDelegate {
func selectedPost(cell: String)
}
class TableViewCell1: UITableViewCell {
var images = [String]()
var selecetdItem: Model?
var postDelegate: PostDelegate?
}
extension TableViewCell1: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return images.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell1
cell.imagesView.sd_setImage(with: URL(string: images[indexPath.item]))
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
postDelegate?.selectedPost(cell: self.images[indexPath.item])
print(images[indexPath.item])
}
}
2ndVC (适用的的viewController ):
class ViewController3: UIViewController {
@IBOutlet weak var collectionView: UICollectionView!
// var images = [String]()
var images: [Model] = []
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
extension ViewController3: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return images.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell3
// let array = [images[indexPath.item].images,
// images[indexPath.item].images2]
// cell.imagesView.sd_setImage(with: URL(string: array[indexPath.item]))
// cell.imagesView.sd_setImage(with: URL(string: images[indexPath.item]))
return cell
}
}
模型( swift文件有一个类):
class Model {
var image: String!
var image2: String!
var images: [String] = []
var images2: [String] = []
var ref: FIRDatabaseReference!
init(snapshot: FIRDataSnapshot) {
ref = snapshot.ref
let value = snapshot.value as! NSDictionary
let snap1 = value["hall1"] as? NSDictionary
let snap2 = value["hall2"] as? NSDictionary
image = snap1?["qwerty"] as? String ?? ""
image2 = snap2?["qwerty"] as? String ?? ""
if let post1 = snap1 as? [String: AnyObject] {
for (_, value) in post1["images"] as! [String: AnyObject] {
self.images.append(value as! String)
}
}
if let post1 = snap1 as? [String: AnyObject] {
for (_, value) in post1["images"] as! [String: AnyObject] {
self.images2.append(value as! String)
}
}
}
}
答案 0 :(得分:0)
将ViewController1作为TableViewCell1
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TableViewCell1
//make VC1 as post delegate of cell
(cell as! TableViewCell1).postDelegate = self
cell.images = [image[indexPath.row].image,
image[indexPath.row].image2]
return cell
}
最后实施
extension ViewController1 : PostDelegate {
func selectedPost(cell: String) {
//call self.perform segue or load VC2 and pass data here
}
}
一撮建议:
var postDelegate: PostDelegate?
将导致强烈持有对传递的委托的引用。这将导致内存泄漏。为了使其更安全,将委托声明为weak
weak var postDelegate: PostDelegate?
为了使协议变弱你的协议
protocol PostDelegate: NSObjectProtocol {
func selectedPost(cell: String)
}