Swift - 自定义 SectionIndexTitles 在 Tableview 中不起作用
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【中文标题】Swift - 自定义 SectionIndexTitles 在 Tableview 中不起作用【英文标题】：Swift - Custom SectionIndexTitles not working in Tableview 【发布时间】：2016-01-01 21:31:00 【问题描述】：我有一个 UISplitViewController，我用 UIViewController 替换了 UITableView。这个 ViewController 包含一个 UITableView 和一个 UIView。 UIView 包含我的自定义 SectionIndexTitles UIControl，用于滚动到右侧部分。
我的自定义 SectionIndexTitles UIControl 在带有 UICollectionView 的 ViewController 中完美运行，但不知何故它在前面提到的配置中不起作用。我该如何解决这个问题？
应用程序编译并且不会崩溃。当我擦洗 UIControl 时，不会调用 indexViewValueChanged() 函数。我已经使用 View Debugger 检查了 View 层次结构，但它位于 TableView 之上。我还尝试添加一个手势识别器，它确实有效。最后我尝试设置 zPosition，但这没有任何效果。
Github example
视图控制器
import UIKit
class ViewController: UIViewController
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var indexTitlesContainer: UIView!
/* type to represent table items
`section` stores a `UITableView` section */
class User: NSObject
let name: String
var section: Int?
init(name: String)
self.name = name
// custom type to represent table sections
class Section
var users: [User] = []
func addUser(user: User)
self.users.append(user)
// raw user data
let names = [
"Clementine",
"Tim",
"Bessie",
"Yolande",
"Tynisha",
"Ellyn",
"Trudy",
"Fredrick",
"Letisha",
"Ariel",
"Bong",
"Jacinto",
"Dorinda",
"Aiko",
"Loma",
"Augustina",
"Margarita",
"Jesenia",
"Kellee",
"Annis",
"Charlena"
]
// `UIKit` convenience class for sectioning a table
let collation = UILocalizedIndexedCollation.currentCollation()
// table sections
var sections: [Section]
// return if already initialized
if self._sections != nil
return self._sections!
// create users from the name list
let users: [User] = names.map name in
let user = User(name: name)
user.section = self.collation.sectionForObject(user, collationStringSelector: "name")
return user
// create empty sections
var sections = [Section]()
for i in 0..<self.collation.sectionIndexTitles.count
sections.append(Section())
// put each user in a section
for user in users
sections[user.section!].addUser(user)
// sort each section
for section in sections
section.users = self.collation.sortedArrayFromArray(section.users, collationStringSelector: "name") as! [User]
self._sections = sections
return self._sections!
var _sections: [Section]?
var indexTitles: IndexTitles!
override func viewDidLoad()
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
indexTitles = IndexTitles(frame: CGRectZero, indexTitles: collation.sectionIndexTitles)
indexTitles.addTarget(self, action: "indexViewValueChanged:", forControlEvents: .ValueChanged)
indexTitlesContainer.addSubview(indexTitles)
func indexViewValueChanged(sender: IndexTitles)
print("perform function")
var index = sender.index
if self.sections[index].users.count == 0
var shouldPerform = true
for var i = index as Int; i < self.sections[index].users.count; i++
if shouldPerform == true
if self.sections[index].users.count != 0
shouldPerform = false
index = i
for var i = index as Int; i > 0; i--
if shouldPerform == true
if self.sections[index].users.count != 0
shouldPerform = false
index = i
let path = NSIndexPath(forRow: 0, inSection: index)
tableView.scrollToRowAtIndexPath(path, atScrollPosition: .Top, animated: false)
let scrollPosition = tableView.contentOffset.y
let collectionViewHeight = (tableView.contentSize.height - tableView.bounds.size.height) + 54
if scrollPosition != collectionViewHeight
tableView.contentOffset = CGPoint(x: tableView.contentOffset.x, y: tableView.contentOffset.y - 22.0)
override func viewDidLayoutSubviews()
let height = CGFloat(collation.sectionIndexTitles.count * 18)
let y = (indexTitlesContainer.bounds.height - height) / 3
indexTitles.frame = CGRectMake(0, y, indexTitlesContainer.bounds.width, height)
override func didReceiveMemoryWarning()
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
extension ViewController:UITableViewDataSource
func numberOfSectionsInTableView(tableView: UITableView) -> Int
return self.sections.count
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
return self.sections[section].users.count
func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String?
return collation.sectionIndexTitles[section]
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
let user = self.sections[indexPath.section].users[indexPath.row]
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
cell.textLabel!.text = user.name
cell.backgroundColor = UIColor.clearColor()
return cell
自定义 UIControl
import UIKit
class IndexTitles: UIControl,UIGestureRecognizerDelegate
var indexTitles:NSArray!
var visualEffect: UIVisualEffectView!
var index:Int!
func translate(touch:CGFloat)
let selectedIndex = Int(touch / 18)
let indexCount = indexTitles.count - 1
if selectedIndex < 0
index = 0
else if selectedIndex > indexCount
index = indexCount
else
index = selectedIndex
sendActionsForControlEvents(.ValueChanged)
//Sets the right index when the label is selected.
override func beginTrackingWithTouch(touch: UITouch, withEvent event: UIEvent?) -> Bool
translate(touch.locationInView(self).y)
return true
override func continueTrackingWithTouch(touch: UITouch, withEvent event: UIEvent?) -> Bool
translate(touch.locationInView(self).y)
return true
//Setup for when the view is being initialized.
init(frame: CGRect, indexTitles:NSArray)
super.init(frame: frame)
self.indexTitles = indexTitles
let multiplier = 18
visualEffect = UIVisualEffectView(frame: CGRectMake(0, 0, 18, CGFloat(multiplier * indexTitles.count)))
visualEffect.effect = UIVibrancyEffect(forBlurEffect: UIBlurEffect(style: .ExtraLight))
self.addSubview(visualEffect)
for var i = 0; i < indexTitles.count; i++
let label = UILabel(frame: CGRectMake(0, CGFloat(multiplier * i) , 20 , 18))
label.font = UIFont.systemFontOfSize(12, weight: UIFontWeightSemibold)
label.numberOfLines = 0
label.textAlignment = .Center
label.text = indexTitles[i] as? String
visualEffect.contentView.addSubview(label)
required init?(coder aDecoder: NSCoder)
super.init(coder: aDecoder)
【问题讨论】：
你说不行。以什么方式不起作用？请澄清实际问题是什么。 @rmaddy UITableView 可以创建一个scrubber 来滚动到右侧部分。我不喜欢它的外观，所以我自己做了。洗涤器适用于 CollectionViews，但不适用于此配置。 我知道。你说过“它不起作用”。但这非常模糊。它编译吗？它会崩溃吗？它是否以某种意想不到的方式起作用？你做了什么调试？ @rmaddy 该应用程序编译并且不会崩溃。当我擦洗 indexViewValueChanged() 函数时不会被调用。我已经使用 View Debugger 检查了 View 层次结构，但它位于 TableView 之上。我还尝试添加一个手势识别器，它确实有效。最后我尝试设置 zPosition，但这没有任何效果。 @rmaddy 嗨，我好像忘记添加 Github 链接了。我很抱歉造成混乱。 【参考方案1】：在 UIControl 中，子视图 UserInteractionEnabled 必须设置为 false。
【讨论】：
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