我如何在 table 视图中自动滚动？ (Swift)

Question

我在 table 视图中添加了一个搜索栏，当用户搜索时，我希望 table 视图滚动到您键入的文本。

如何让滚动视图自动滚动？

这是我尝试过的方法，但我收到一条错误消息，指出整数无法转换为索引路径。我该怎么办？

self.tableview.scrollToRowAtIndexPath(1, atScrollPosition: UITableViewScrollPosition.Middle, animated: true)

或

self.tableview.scrollToNearestSelectedRowAtScrollPosition(scrollPosition: UITableViewScrollPosition.Middle, animated: true)

Answer 1

您必须按以下方式调用方法 scrollToRowAtIndexPath :

var indexPath = NSIndexPath(forRow: numberOfRowYouWant, inSection: 0)
self.tableview.scrollToRowAtIndexPath(indexPath, 
               atScrollPosition: UITableViewScrollPosition.Middle, animated: true)

以上示例假设您只有一个部分。希望对你有帮助。

对于Swift 3:

let indexPath = NSIndexPath(item: numberOfRowYouWant, section: 2)
tableView.scrollToRow(at: indexPath as IndexPath, at: UITableViewScrollPosition.middle, animated: true)

对于Swift 4:

let indexPath = NSIndexPath(item: numberOfRowYouWant, section: 2)
tableView.scrollToRow(at: indexPath as IndexPath, at: UITableView.ScrollPosition.middle, animated: true)

Answer 2

如果你想自动向下滚动：

numberOfSections = tableView.numberOfSections()
let numberOfRows = tableView.numberOfRowsInSection(numberOfSections-1)

var indexPath = NSIndexPath(forRow: numberOfRows, inSection: numberOfSections)
self.tableview.scrollToRowAtIndexPath(indexPath, 
               atScrollPosition: UITableViewScrollPosition.Middle, animated: true)

Swift 4:

let numberOfSections = tableView.numberOfSections
let numberOfRows = tableView.numberOfRows(inSection: numberOfSections - 1)

let indexPath = NSIndexPath(row: numberOfRows, section: numberOfSections)
self.tableView.scrollToRow(at: indexPath as IndexPath,
                                  at: UITableView.ScrollPosition.middle, animated: true)

Answer 3

这里是 Swift 2.0 版本，可滚动到多个部分的最后一行，基于本线程前面 Thiago 中的代码：

let numberOfSections = self.tableView.numberOfSections
let numberOfRows = self.tableView.numberOfRowsInSection(numberOfSections-1)

print ("scrolling to bottom row \(numberOfRows)")

let indexPath = NSIndexPath(forRow: numberOfRows-1, inSection: numberOfSections-1)
self.tableView.scrollToRowAtIndexPath(indexPath,
                        atScrollPosition: UITableViewScrollPosition.Middle, animated: true)

Answer 4

对于 Swift 5 ( Xcode 11.2.1 ):

    let numberOfSections = self.tableView.numberOfSections
    let numberOfRows = self.tableView.numberOfRows(inSection: numberOfSections-1)

    let indexPath = IndexPath(row: numberOfRows-1 , section: numberOfSections-1)
    self.tableView.scrollToRow(at: indexPath, at: .middle, animated: true)

对于Swift 2:

    let numberOfSections = self.tableView.numberOfSections
    let numberOfRows = self.tableView.numberOfRows(inSection: numberOfSections-1)

    let indexPath = IndexPath(row: numberOfRows-1 , section: numberOfSections-1)
    self.tableView.scrollToRow(at: indexPath, at: UITableViewScrollPosition.middle, animated: true)

Answer 5

SWIFT 4

/* Variables */
  var scrollTimer = Timer()


//  AN AUTOMATIC SCROLL OF THE YOUT IMAGE
scrollTimer = Timer.scheduledTimer(timeInterval: 3.0, target: self, selector: #selector(automaticScroll), userInfo: nil, repeats: true)




// MARK: - SCROLLVIEW DELEGATE: SHOW CURRENT PAGE IN THE PAGE CONTROL
func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let pageWidth = containerScrollView.frame.size.width
    let page = Int(floor((containerScrollView.contentOffset.x * 2 + pageWidth) / (pageWidth * 2)))
    pageControl.currentPage = page

}

// MARK: - AUTOMATIC SCROLL
@objc func automaticScroll() {
    var scroll = containerScrollView.contentOffset.x
    if scroll < CGFloat(view.frame.size.width) * CGFloat(numberOfImages-1) {
        scroll += CGFloat(view.frame.size.width)
        containerScrollView.setContentOffset(CGPoint(x: scroll, y:0), animated: true)
    } else {
        // Stop the timer
        scrollTimer.invalidate()
    }
}

Answer 6

Swift 4:

let indexPath = IndexPath(row: numberOfRowYouWant, section: 0) 

self.verbsTable.scrollToRow(at: indexPath, at: UITableViewScrollPosition.middle, animated: true)

我如何在 table 视图中自动滚动？ (Swift)

How do i automatically scroll in a table view? (Swift)

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