In my table view I have to scroll to the top. But I cannot guarantee that the first object is going to be section 0, row 0. May be that my table view will start from section number 5.
So I get an exception, when I call:
[mainTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
Is there another way to scroll to the top of table view?
UITableView is a subclass of UIScrollView, so you can also use:
[mainTableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];
Or
[mainTableView setContentOffset:CGPointZero animated:YES];
And in Swift:
mainTableView.setContentOffset(CGPointZero, animated:true)
And in Swift 3 & above:
mainTableView.setContentOffset(.zero, animated: true)
Possible Actions:
1
func scrollToFirstRow() {
let indexPath = NSIndexPath(forRow: 0, inSection: 0)
self.tableView.scrollToRowAtIndexPath(indexPath, atScrollPosition: .Top, animated: true)
}
2
func scrollToLastRow() {
let indexPath = NSIndexPath(forRow: objects.count - 1, inSection: 0)
self.tableView.scrollToRowAtIndexPath(indexPath, atScrollPosition: .Bottom, animated: true)
}
3
func scrollToSelectedRow() {
let selectedRows = self.tableView.indexPathsForSelectedRows
if let selectedRow = selectedRows?[0] as? NSIndexPath {
self.tableView.scrollToRowAtIndexPath(selectedRow, atScrollPosition: .Middle, animated: true)
}
}
4
func scrollToHeader() {
self.tableView.scrollRectToVisible(CGRect(x: 0, y: 0, width: 1, height: 1), animated: true)
}
5
func scrollToTop(){
self.tableView.setContentOffset(CGPointMake(0, UIApplication.sharedApplication().statusBarFrame.height ), animated: true)
}
Disable Scroll To Top:
func disableScrollsToTopPropertyOnAllSubviewsOf(view: UIView) {
for subview in view.subviews {
if let scrollView = subview as? UIScrollView {
(scrollView as UIScrollView).scrollsToTop = false
}
self.disableScrollsToTopPropertyOnAllSubviewsOf(subview as UIView)
}
}
Modify and use it as per requirement.
Swift 4
func scrollToFirstRow() {
let indexPath = IndexPath(row: 0, section: 0)
self.tableView.scrollToRow(at: indexPath, at: .top, animated: true)
}
I've encountered an issue calling trying some of the methods on an empty tableView. Here's another option for Swift 4 that handles empty tableviews.
extension UITableView {
func hasRowAtIndexPath(indexPath: IndexPath) -> Bool {
return indexPath.section < self.numberOfSections && indexPath.row < self.numberOfRows(inSection: indexPath.section)
}
func scrollToTop(animated: Bool) {
let indexPath = IndexPath(row: 0, section: 0)
if self.hasRowAtIndexPath(indexPath: indexPath) {
self.scrollToRow(at: indexPath, at: .top, animated: animated)
}
}
}
Usage:
// from yourViewController or yourTableViewController
tableView.scrollToTop(animated: true)//or false
On iOS 11, use adjustedContentInset to correctly scroll to top for both cases when the in-call status bar is visible or not.
if (@available(iOS 11.0, *)) {
[tableView setContentOffset:CGPointMake(0, -tableView.adjustedContentInset.top) animated:YES];
} else {
[tableView setContentOffset:CGPointMake(0, -tableView.contentInset.top) animated:YES];
}
Swift:
if #available(iOS 11.0, *) {
tableView.setContentOffset(CGPoint(x: 0, y: -tableView.adjustedContentInset.top), animated: true)
} else {
tableView.setContentOffset(CGPoint(x: 0, y: -tableView.contentInset.top), animated: true)
}
DONT USE
tableView.setContentOffset(.zero, animated: true)
It can sometimes set the offset improperly. For example, in my case, the cell was actually slightly above the view with safe area insets. Not good.
INSTEAD USE
tableView.scrollToRow(at: IndexPath(row: 0, section: 0), at: .top, animated: true)
Swift 5, iOS 13
I know this question already has a lot of answers but from my experience this method always works:
let last = IndexPath(row: someArray.count - 1, section: 0)
tableView.scrollToRow(at: last, at: .bottom, animated: true)
And this is especially true if you're working with animations (like keyboard) or certain async tasks—the other answers will often scroll to the almost bottom. If for some reason this doesn't get you all the way to the bottom, it's almost certainly because of a competing animation so the workaround is to dispatch this animation to the end of the main queue:
DispatchQueue.main.async {
let last = IndexPath(row: self.someArray.count - 1, section: 0)
self.tableView.scrollToRow(at: last, at: .bottom, animated: true)
}
This may seem redundant since you're already on the main queue but it's not because it serializes the animations.
Since my tableView is full of all kinds of insets, this was the only thing that worked well:
Swift 3
if tableView.numberOfSections > 0 && tableView.numberOfRows(inSection: 0) > 0 {
tableView.scrollToRow(at: IndexPath(row: 0, section: 0), at: .top, animated: true)
}
Swift 2
if tableView.numberOfSections > 0 && tableView.numberOfRowsInSection(0) > 0 {
tableView.scrollToRowAtIndexPath(NSIndexPath(forRow: 0, inSection: 0), atScrollPosition: .Top, animated: true)
}
Adding on to what's already been said, you can create a extension (Swift) or category (Objective C) to make this easier in the future:
Swift:
extension UITableView {
func scrollToTop(animated: Bool) {
setContentOffset(CGPointZero, animated: animated)
}
}
Any time you want to scroll any given tableView to the top you can call the following code:
tableView.scrollToTop(animated: true)
Swift :
if you don't have tableView header :
tableView.setContentOffset(CGPointMake(0, UIApplication.sharedApplication().statusBarFrame.height ), animated: true)
if so :
tableView.setContentOffset(CGPointMake(0, -tableViewheader.frame.height + UIApplication.sharedApplication().statusBarFrame.height ), animated: true)
In Swift 5 , Thanks @Adrian's answer a lot
extension UITableView{
func hasRowAtIndexPath(indexPath: IndexPath) -> Bool {
return indexPath.section < numberOfSections && indexPath.row < numberOfRows(inSection: indexPath.section)
}
func scrollToTop(_ animated: Bool = false) {
let indexPath = IndexPath(row: 0, section: 0)
if hasRowAtIndexPath(indexPath: indexPath) {
scrollToRow(at: indexPath, at: .top, animated: animated)
}
}
}
Usage:
tableView.scrollToTop()
This was the only code snippet that worked for me
Swift 4:
tableView.scrollRectToVisible(CGRect(x: 0, y: 0, width: 1, height: 1), animated: true)
tableView.scrollToRow(at: IndexPath(row: 0, section: 0), at: .top, animated: true)
tableView.setContentOffset(CGPoint(x: 0, y: -70), animated: true)
P.S. 70 is the height of my header and table view cell
I use tabBarController and i have a few section in my tableview at every tab, so this is best solution for me.
extension UITableView {
func scrollToTop(){
for index in 0...numberOfSections - 1 {
if numberOfSections > 0 && numberOfRows(inSection: index) > 0 {
scrollToRow(at: IndexPath(row: 0, section: index), at: .top, animated: true)
break
}
if index == numberOfSections - 1 {
setContentOffset(.zero, animated: true)
break
}
}
}
}
I had to add the multiply by -1 * to the sum of the status bar and the navigation bar, because it was going that height off the screen,
self.tableView.setContentOffset(CGPointMake(0 , -1 *
(self.navigationController!.navigationBar.height +
UIApplication.sharedApplication().statusBarFrame.height) ), animated:true)
in swift
your row = selectioncellRowNumber your section if you have = selectionNumber if you dont have set is to zero
//UITableViewScrollPosition.Middle or Bottom or Top
var lastIndex = NSIndexPath(forRow: selectioncellRowNumber, inSection: selectionNumber)
self.tableView.scrollToRowAtIndexPath(lastIndex, atScrollPosition: UITableViewScrollPosition.Middle, animated: true)
Here is a simple example of UIScrollView extension that you can use everywhere in your app.
1) First you should create enum with possible scroll directions:
enum ScrollDirection {
case top, right, bottom, left
func contentOffsetWith(_ scrollView: UIScrollView) -> CGPoint {
var contentOffset = CGPoint.zero
switch self {
case .top:
contentOffset = CGPoint(x: 0, y: -scrollView.contentInset.top)
case .right:
contentOffset = CGPoint(x: scrollView.contentSize.width - scrollView.bounds.size.width, y: 0)
case .bottom:
contentOffset = CGPoint(x: 0, y: scrollView.contentSize.height - scrollView.bounds.size.height)
case .left:
contentOffset = CGPoint(x: -scrollView.contentInset.left, y: 0)
}
return contentOffset
}
}
2) Then add extension to UIScrollView:
extension UIScrollView {
func scrollTo(direction: ScrollDirection, animated: Bool = true) {
self.setContentOffset(direction.contentOffsetWith(self), animated: animated)
}
}
3) Thats it! Now you can use it:
myScrollView.scrollTo(.top, animated: false)
This scroll bind to the tableView's content size and it looks more natural than scroll to CGPoint.zero
If you i would like move scroll animation in the table, use this code. The scroll move to top with animation in .5 seconds.
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
[_tableContent scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];
[UIView commitAnimations];
