我如何自动滚动表格视图？ （Swift）

Question

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

如何自动滚动滚动视图？

这是我试过的，但我得到一个错误，说一个整数不能转换为索引路径。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

你要调用的方法scrollToRowAtIndexPath以下列方式：

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

上面的例子假设你只有一个部分。我希望这对你有所帮助。

对于斯威夫特3：

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

Answer 3

这里的雨燕2.0的版本滚动到多节的最后一排的基础上，从Thiago代码在此线程中：

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 3（Xcode 8.1）：

 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: 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

斯威夫特4：

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

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