UITableView is reloaded when presentviewcontroller or pushviewcontroller - uitableview

Question

I have a uitableview with some complex cells,
If I do presentviewcontroller or pushviewcontroller when I press the button in the cell,
it will reload data automatically,
how can i stop it?
this is the base Controller
import UIKit
class Controller: UIViewController{
override func viewDidLoad() {
super.viewDidLoad();
initView();
}
func initView(){
self.view.backgroundColor = UIColor.whiteColor();
}
override func preferredStatusBarStyle() -> UIStatusBarStyle {
return UIStatusBarStyle.LightContent;
}
}
and this is the second level
import Foundation
class LoadableController: Controller {
var requestNum : Int = 0;
func loadData(complete: (()->Void)? = nil){
self.requestComplete();
}
func requestComplete(){
if(self.requestNum == 0){
requestFinished();
return;
}
self.requestNum = self.requestNum > 0 ? self.requestNum - 1 : 0;
if(self.requestNum == 0){
requestFinished();
}
}
func requestFinished(){}
}
this is the third level
class TableListViewController: LoadableController, UITableViewDelegate, UITableViewDataSource {
var tableView : UITableView?;
var curPage : Int = 0;
var totalPage : Int = 0;
override func viewDidLoad() {
super.viewDidLoad()
}
override func initView() {
super.initView();
tableView = UITableView();
tableView!.delegate = self;
tableView!.dataSource = self;
tableView!.delaysContentTouches = false;
tableView!.canCancelContentTouches = true;
self.view.addSubview(tableView!);
tableView!.snp_makeConstraints { [unowned self](make) in
make.edges.equalTo(self.view);
}
let header = EGRefresh(refreshingTarget: self, refreshingAction: #selector(self.loadData));
header.setImages(Global.LOADING_IMAGES, duration: 0.16, forState: .Idle);
header.setImages(Global.LOADING_IMAGES, duration: 0.16, forState: .Pulling);
header.setImages(Global.LOADING_IMAGES, duration: 0.16, forState: .WillRefresh);
header.setImages(Global.LOADING_IMAGES, duration: 0.16, forState: .Refreshing);
header.lastUpdatedTimeLabel.hidden = true;
tableView!.mj_header = header;
let footer = MJRefreshBackNormalFooter.init(refreshingTarget: self, refreshingAction: #selector(self.loadNext));
tableView!.mj_footer = footer;
}
func loadNext(){
tableView!.mj_footer.endRefreshing();
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("ListCell", forIndexPath: indexPath);
return cell;
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1;
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1;
}
override func requestFinished() {
tableView!.mj_header.endRefreshing();
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
deinit{
DDLogInfo("TableListViewController deinit");
}
}
and here is the place where the tableview reload automatically.
import UIKit
class CircleViewController: TableListViewController {
override func viewDidLoad() {
super.viewDidLoad();
}
override func initView(){
super.initView();
self.title = "Circle";
let items = ["One", "Two"];
let segment = UISegmentedControl(items: items);
segment.selectedSegmentIndex = 0;
segment.setWidth(80, forSegmentAtIndex: 0);
segment.setWidth(80, forSegmentAtIndex: 1);
self.navigationItem.titleView = segment;
tableView!.estimatedRowHeight = 50;
tableView!.rowHeight = UITableViewAutomaticDimension;
// tableView!.contentInset = UIEdgeInsetsMake(Dimens.TopBarHeight, 0, 0, 0);
tableView!.registerClass(TextOnlyCell.self, forCellReuseIdentifier: "CircleTextOnlyCell");
tableView!.registerClass(ImageAndPageCell.self, forCellReuseIdentifier: "CircleImageAndPageCell");
Event.addEventListener(self, selector: #selector(self.goComment(_:)), name: EventType.CIRCLE_COMMENT, object: nil);
}
func goComment(ns: NSNotification) {
let commentView = PostCommentViewController();
self.navigationController?.pushViewController(commentView, animated: true);
}
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension;
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10;
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true);
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1;
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("CircleImageAndPageCell", forIndexPath: indexPath) as? ImageAndPageCell;
if cell == nil {
cell = ImageAndPageCell.init(style: .Default, reuseIdentifier: "CircleImageAndPageCell");
}
let images = [UIImage(named: "b.jpg")!, UIImage(named: "a.jpg")!, UIImage(named: "c.jpg")!, UIImage(named: "a.jpg")!];
cell?.initView(nil, nickname: "im a nickname", time: "10 min", content: NSMutableAttributedString(string: "asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf"), likeNum: 10, commentNum: 12, shareNum: 13, totalLine: 20, images: images, cellIndex: indexPath.row, hasPage: true, pageIcon: UIImage(named: "c.jpg")!, titleStr: "ahahaha");
return cell!;
}
override func loadData(complete: (() -> Void)?) {
self.requestComplete();
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
deinit {
Event.removeAllEventListener(self);
DDLogInfo("CircleViewController deinit");
}
}
If goComment be called,
the viewcontroller will be pushed,
then the tableview will jump to top,
I add a break point to the cellForRowAtIndexPath,
it's called.
then I tried the presentviewcontroller,
this problem also happened,
even though I did presentviewcontroller in the outside viewcontroller.
it seems not reload data,
it's just scrolls to the top.

Answer 1

it's looking like table view not taking the uitoolbar size(44 points) in account
Save the tableview offset in prepareForSegue: (save it in a CGPoint property)
self.tableViewScrollOffset = self.tableView.contentOffset;
Then, in viewWillAppear:, check if it has been modified. If so, restore it.
if(self.tableView.contentOffset.y != self.tableViewScrollOffset.y) {
[self.tableView setContentOffset:self.tableViewScrollOffset];
self.tableViewScrollOffset = CGPointZero;
}