我不能讓Kaushal的建議工作的說明。它確實給了我一個線索,我對嵌入集合視圖的視圖的定位被錯誤地放置在viewDidLoad中,原因是我沒有理解。但是通過將view view配置放在viewDidAppear(而不是viewDidLoad)中,它運行良好。我將y位置偏移64以清除導航欄,並將行高降低爲64.我還將代碼僅執行一次,以便從頁面導航不會添加彼此頂部的多個視圖。順便說一句,我最初的目標是水平滾動單元格。在我的程序中,我有與相應的部分tableview和想法是使用水平滾動單元格的行移動到相應的部分。
的代碼如下所示:
//
// CustomViewController.swift
// DSM Tracker
//
// Created by Syed Tariq on 1/7/17.
// Copyright © 2017 com.syedtariq. All rights reserved.
//
import UIKit
class ViewController: UIViewController,
UICollectionViewDelegate,
UICollectionViewDataSource,
UINavigationControllerDelegate
{
var executeOnce = true
var cellDimensions = [String:Int]()
var cellHeight = 50
var cellWidth = 120
var collectionContainerView: UICollectionView!
var navBar: UINavigationBar = UINavigationBar()
// view constants
var viewY = CGFloat()
var viewX = CGFloat()
var viewWidth = CGFloat()
var viewHeight = CGFloat()
// gaps from view edge
let leftGap = CGFloat(20)
let rightGap = CGFloat(20)
// navbar constants
let navBarHeight = CGFloat(64)
var headerLabels = ["Cell 01","Cell 02","Cell 03","Cell 04","Cell 05","Cell 06","Cell 07","Cell 08","Cell 09","Cell 10","Cell 11","Cell 12","Cell 13","Cell 14","Cell 15","Cell 16"]
override func viewDidLoad() {
super.viewDidLoad()
navBar.backgroundColor = UIColor.green
executeOnce = true
viewY = view.frame.origin.y
viewX = view.frame.origin.x
viewWidth = view.frame.width
viewHeight = view.frame.height
}
func configureCollectionView() {
if executeOnce {
executeOnce = false
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
layout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 10)
layout.itemSize = CGSize(width: cellWidth, height: cellHeight)
let colWidth = viewWidth - leftGap - rightGap
let colX = viewX + leftGap
let colY = viewY + navBarHeight
let colHeight = CGFloat(64)
let frame = CGRect(x:colX, y:colY, width: colWidth, height: colHeight)
//let frame = CGRect.zero
collectionContainerView = UICollectionView (frame: frame, collectionViewLayout: layout)
collectionContainerView.dataSource = self
collectionContainerView.delegate = self
collectionContainerView.autoresizingMask = [.flexibleLeftMargin,.flexibleLeftMargin,.flexibleBottomMargin,.flexibleRightMargin, .flexibleHeight, .flexibleWidth]
collectionContainerView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "collectionCell")
collectionContainerView.backgroundColor = UIColor.blue
collectionContainerView.allowsSelection = true
collectionContainerView.isScrollEnabled = true
collectionContainerView.setNeedsDisplay()
print("collectionContainerView.frame \(collectionContainerView.frame)")
view.addSubview(collectionContainerView)
}
}
override func viewDidAppear(_ animated: Bool) {
configureCollectionView()
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("headerLabels.count \(headerLabels.count)")
return headerLabels.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionCell", for: indexPath as IndexPath)
for v in cell.subviews {
v.removeFromSuperview()
}
let cellTitle = headerLabels[indexPath.row]
let cellTitleLines = cellTitle.components(separatedBy: " ")
let nLabels = cellTitleLines.count
cell.layer.borderWidth = 1
cell.layer.cornerRadius = 8
let labelHeight = cellHeight/cellTitleLines.count
for i in (0 ..< nLabels) {
let frame = CGRect(x: 0, y: labelHeight * i, width: cellWidth, height: labelHeight)
let label1 = UILabel(frame: frame)
cell.backgroundColor = UIColor.lightGray
label1.numberOfLines = 1
label1.text = headerLabels[indexPath.row]
label1.textAlignment = .center
label1.textColor = UIColor.black
label1.clipsToBounds = true
label1.adjustsFontSizeToFitWidth = true
label1.text = cellTitleLines[i]
cell.addSubview(label1)
}
return cell
}
func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
collectionContainerView.scrollToItem(at:IndexPath(item: indexPath.item, section: 0), at: .centeredHorizontally, animated: false)
return true
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionContainerView.cellForItem(at: indexPath)
print("cell = \(cell)")
collectionContainerView.scrollToItem(at:IndexPath(item: indexPath.item, section: 0), at: .centeredHorizontally, animated: false)
}
func collectionView(_ collectionView: UICollectionView, shouldHighlightItemAt indexPath: IndexPath) -> Bool {
return true
}
func collectionView(_ collectionView: UICollectionView, didHighlightItemAt indexPath: IndexPath) {
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
}
}
我限制了其具有集合視圖作爲子圖,以64(強制單個行)的頂視圖的高度。當我將頂視圖的高度增加到128時,單元顯示在第二行。我不清楚爲什麼導航控制器與強迫單元格進入較低行有關。任何指導將不勝感激。 –
不要爲collectionview手動設置框架,而是嘗試使用此代碼而不是collectionView = UICollectionView(frame:CGRect.zero,collectionViewLayout:layout)collectionView.autoresizingMask = [.flexibleLeftMargin,.flexibleLeftMargin,.flexibleBottomMargin,.flexibleRightMargin,.flexibleHeight, .flexibleWidth] collectionView.setNeedsDisplay()//在viewdidAppear中移動所有集合視圖代碼。 – kaushal