Uicollectionview 单元格只环绕文本
Uicollectionview cell only wraps around text
我的 swift 代码 collectionviewcell 在所有代码中而不是情节提要中。正如你在我下面的照片中看到的那样。 uicollectionviewcell 围绕着一个数字,我希望 collectionviewcell 中有更多 space。我不知道如何使用下面的代码向 uicollectionviewcell 添加高约束。简而言之,只需将每个集合单元格设为 100 高和 100 宽,谢谢。
import UIKit
class Cell: UICollectionViewCell {
static var identifier: String = "Cell"
weak var textLabel: UILabel!
override init(frame: CGRect) {
super.init(frame: frame)
let textLabel = UILabel(frame: .zero)
textLabel.translatesAutoresizingMaskIntoConstraints = false
self.contentView.addSubview(textLabel)
NSLayoutConstraint.activate([
self.contentView.centerXAnchor.constraint(equalTo: textLabel.centerXAnchor),
self.heightAnchor.constraint(equalToConstant: 100),
self.contentView.centerYAnchor.constraint(equalTo: textLabel.centerYAnchor),
])
self.textLabel = textLabel
self.reset()
textLabel.backgroundColor = .yellow
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
self.reset()
}
func reset() {
self.textLabel.textAlignment = .center
}
}
class ViewController: UIViewController {
weak var collectionView: UICollectionView!
var data: [Int] = Array(0..<10)
override func loadView() {
super.loadView()
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())
collectionView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(collectionView)
NSLayoutConstraint.activate([
self.view.topAnchor.constraint(equalTo: collectionView.topAnchor),
self.view.bottomAnchor.constraint(equalTo: collectionView.bottomAnchor),
self.view.leadingAnchor.constraint(equalTo: collectionView.leadingAnchor),
self.view.trailingAnchor.constraint(equalTo: collectionView.trailingAnchor),
])
self.collectionView = collectionView
}
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView.dataSource = self
self.collectionView.delegate = self
self.collectionView.register(Cell.self, forCellWithReuseIdentifier: Cell.identifier)
self.collectionView.alwaysBounceVertical = true
self.collectionView.backgroundColor = .brown
}
}
extension ViewController: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView,
numberOfItemsInSection section: Int) -> Int {
return self.data.count
}
func collectionView(_ collectionView: UICollectionView,
cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Cell.identifier, for: indexPath) as! Cell
let data = self.data[indexPath.item]
cell.textLabel.text = String(data)
return cell
}
}
extension ViewController: UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
}
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.bounds.width, height: 60)
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) //.zero
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
}
将 sizeForItemAt 方法更新为 return w = 100 h = 100
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: 100)
}
}
我的 swift 代码 collectionviewcell 在所有代码中而不是情节提要中。正如你在我下面的照片中看到的那样。 uicollectionviewcell 围绕着一个数字,我希望 collectionviewcell 中有更多 space。我不知道如何使用下面的代码向 uicollectionviewcell 添加高约束。简而言之,只需将每个集合单元格设为 100 高和 100 宽,谢谢。
import UIKit
class Cell: UICollectionViewCell {
static var identifier: String = "Cell"
weak var textLabel: UILabel!
override init(frame: CGRect) {
super.init(frame: frame)
let textLabel = UILabel(frame: .zero)
textLabel.translatesAutoresizingMaskIntoConstraints = false
self.contentView.addSubview(textLabel)
NSLayoutConstraint.activate([
self.contentView.centerXAnchor.constraint(equalTo: textLabel.centerXAnchor),
self.heightAnchor.constraint(equalToConstant: 100),
self.contentView.centerYAnchor.constraint(equalTo: textLabel.centerYAnchor),
])
self.textLabel = textLabel
self.reset()
textLabel.backgroundColor = .yellow
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
self.reset()
}
func reset() {
self.textLabel.textAlignment = .center
}
}
class ViewController: UIViewController {
weak var collectionView: UICollectionView!
var data: [Int] = Array(0..<10)
override func loadView() {
super.loadView()
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())
collectionView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(collectionView)
NSLayoutConstraint.activate([
self.view.topAnchor.constraint(equalTo: collectionView.topAnchor),
self.view.bottomAnchor.constraint(equalTo: collectionView.bottomAnchor),
self.view.leadingAnchor.constraint(equalTo: collectionView.leadingAnchor),
self.view.trailingAnchor.constraint(equalTo: collectionView.trailingAnchor),
])
self.collectionView = collectionView
}
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView.dataSource = self
self.collectionView.delegate = self
self.collectionView.register(Cell.self, forCellWithReuseIdentifier: Cell.identifier)
self.collectionView.alwaysBounceVertical = true
self.collectionView.backgroundColor = .brown
}
}
extension ViewController: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView,
numberOfItemsInSection section: Int) -> Int {
return self.data.count
}
func collectionView(_ collectionView: UICollectionView,
cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Cell.identifier, for: indexPath) as! Cell
let data = self.data[indexPath.item]
cell.textLabel.text = String(data)
return cell
}
}
extension ViewController: UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
}
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.bounds.width, height: 60)
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) //.zero
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
}
将 sizeForItemAt 方法更新为 return w = 100 h = 100
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: 100)
}
}