How to solve the error "Redundant conformance of viewController to protocol UIScrollViewDelegate in swift?
Solution 1
You are getting this error because your class ViewController
conforming to the protocol UIScrollViewDelegate
in two ways. UITableViewController
is already conforming to that protocol, you dont need to add it again. So remove UIScrollViewDelegate
from there, you are good.
This is how it is UITableViewController
conforms to UITableViewDelegate
which conforms to UIScrollViewDelegate
. This would be enough
class ViewController: UITableViewController{
}
Solution 2
The shortest explanation would be that Your UITableViewController comes with a built in scroll View, so you don't need a delegate for Scrollview. Remove UIScrollViewDelegate
and you will be fine.
Feel free to ask any question :)
Harish Singh
Updated on July 12, 2022Comments
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Harish Singh almost 2 years
I am new on stackOverflow and learning swift. I am getting the error "Redundant conformance of viewController to protocol while working with Stretch headers.UIScrollViewDelegate. I am specifying my code below. please correct any one .
class ViewController: UITableViewController , UIScrollViewDelegate { private let kTableHeaderHeight : CGFloat = 300.0 // Using Implicitly Unwrapped Optional, UIView! var headerView:UIView! let items = [ NewsItem(category: .World, summary: "Climate Change protests, Need to preserve our Ecosysytem"), NewsItem(category: .India, summary: "Climate Change protests, Need to preserve our Ecosysytem"), NewsItem(category: .America, summary: "Climate Change protests,Need to preserve our Ecosysytem"), NewsItem(category: .Japan, summary: "Climate Change protests, Need to preserve our Ecosysytem"), NewsItem(category: .China, summary: "Climate Change protests, Need to preserve our Ecosysytem"), NewsItem(category: .Nepal, summary: "Climate Change protests, Need to preserve our Ecosysytem")] override func viewDidLoad() { super.viewDidLoad() headerView = tableView.tableHeaderView tableView.tableHeaderView = nil tableView.addSubview(headerView) tableView.contentInset = UIEdgeInsetsMake(kTableHeaderHeight, 0, 0, 0) tableView.contentOffset = CGPointMake(0, -kTableHeaderHeight) updateHeaderView() } func updateHeaderView(){ var HeaderRect = CGRectMake(0,-kTableHeaderHeight, tableView.bounds.width, kTableHeaderHeight) if tableView.contentOffset.y < -kTableHeaderHeight{ HeaderRect.origin.y = tableView.contentOffset.y HeaderRect.size.height = -tableView.contentOffset.y } headerView.frame = HeaderRect } override func didReceiveMemoryWarning() {enter code here super.didReceiveMemoryWarning() } override func scrollViewDidScroll(scrollView: UIScrollView) { updateHeaderView() } override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return items.count } override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let item = items[indexPath.row] let cell = tableView.dequeueReusableCellWithIdentifier("Cell" forIndexPath: indexPath) as! NewsItemTableViewCell cell.newsItem = item return cell }
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Harish Singh almost 8 yearsThanks you very much
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Anurag Sharma about 7 yearsWorked for me too!! Thanks, btw it is also given in the firebase sample code here