在行列表中自定義iOS「加載更多」按鈕

Question

我正在使用帶滾動列表的UItableview。現在我有默認的「加載更多」按鈕，一次加載10個對象。它破壞了界面。有關如何定製它的任何想法？ A試了幾件事，但我們沒有運氣。由於

Answer 1

嘗試實施這種方法解析提供用於自定義「加載更多」細胞：

// Override to customize the look of the cell that allows the user to load the next page of objects. 
// The default implementation is a UITableViewCellStyleDefault cell with simple labels. 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForNextPageAtIndexPath:(NSIndexPath *)indexPath { 
    static NSString *CellIdentifier = @"NextPage"; 

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 

    if (cell == nil) { 
     cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; 
    } 

    cell.selectionStyle = UITableViewCellSelectionStyleNone; 
    cell.textLabel.text = @"Load more..."; 

    return cell; 
} 

Answer 2

那麼有沒有什麼可以在定製方面與解析控制器做。此外，該控制器的動畫似乎有點笨拙。在使用具有最新IO 9的組件時，我也遇到了一堆內存錯誤。

出於同樣的原因，我用以下替換了現有的Parse控制器。與標準的PARSE控制器相比，讓我對動畫和設計有了更多的控制權。

如果你想扭轉的tableview的順序，看起來像一個信使的應用程序，請看看here

添加全局變量

var objects = [PFObject(className: "Posts")] 
var lockScrollSensor = false 
let objectsPerPage = 10 

添加到viewDidLoad中

//blank screen 
let blankView = UIView(frame: CGRectMake(0, 0,  self.tableView.frame.size.width, self.tableView.frame.size.height - 60)) 
blankView.tag = 101 
blankView.backgroundColor = customColorYellow() 
self.view.addSubview(blankView) 
self.tableView.backgroundColor = customColorYellow() 
// load tableview 
tableViewFirstLoad() 

Detect t他的tableview滾動的位置移動到呼叫刷新或下一頁

override func scrollViewDidScroll(scrollView: UIScrollView) { 

     let scrollViewHeight = scrollView.frame.size.height; 
     let scrollContentSizeHeight = scrollView.contentSize.height; 
     let scrollOffset = scrollView.contentOffset.y; 

     // refresh - touch top 
     if (scrollOffset < -60) 
     { 
      if lockScrollSensor == false { 
       // stop method from non stop calling 
       lockScrollSensor = true 

       // loader 
       let spinningActivity = MBProgressHUD.showHUDAddedTo(self.parentViewController?.view, animated: true) 
       spinningActivity.color = UIColor.clearColor() 
       spinningActivity.activityIndicatorColor = customColorRed() 
       spinningActivity.yOffset = -Float((self.parentViewController?.view.frame.height)!/2) + 95 

       // call method to load more 
       self.tableViewRefresh({ (done) -> Void in 
        if done == true 
        { 
         // stop loader and free method 
         spinningActivity.hide(true, afterDelay: 0) 
         self.lockScrollSensor = false 

         // animate tableview 
         self.tableView.contentOffset.y = -60 
         UIView.animateWithDuration(1.5, delay: 1, usingSpringWithDamping: 0.5, initialSpringVelocity: 0, options: UIViewAnimationOptions.CurveEaseIn, animations: {() -> Void in 
          self.tableView.contentOffset.y = 0 
           }, completion: nil) 
        } 
       }) 
      } 
     } 
     // load more - touch down 
     else if (scrollOffset + scrollViewHeight > scrollContentSizeHeight) 
     { 
      if lockScrollSensor == false { 
       // stop method from non stop calling 
       lockScrollSensor = true 
       // start loader 
       let spinningActivity = MBProgressHUD.showHUDAddedTo(self.parentViewController?.view, animated: true) 
       spinningActivity.color = customColorYellow() 
       spinningActivity.yOffset = (Float(tableView.frame.size.height)/2)-25 
       // call method to load more 
       self.tableViewLoadMore({ (done) -> Void in 
        if done == true { 
         self.lockScrollSensor = false 
         spinningActivity.hide(true) 
        } 
       }) 
      } 
     } 
    } 

刷新或翻頁方法，將加載您PFObject陣列。

// first load 
func tableViewFirstLoad(result: (done: Bool) -> Void){ 
    var query = PFQuery(className: "Posts") 
    query = segueDataChecker() 
    // limit objects 
    query.limit = objectsPerPage 
    // get objects 
    query.findObjectsInBackgroundWithBlock { (posts: [AnyObject]?, error: NSError?) -> Void in 
     if error != nil 
     { 
      result(done: true) 
      let alertView = createDefaultAlertError(message: "\(error!.localizedDescription.capitalizedString)", actions: [UIAlertAction(title: "Ok", style: UIAlertActionStyle.Cancel, handler: nil)]) 
      self.presentViewController(alertView, animated: true, completion: nil) 
     } 
     else 
     { 
      // clean array 
      self.objects.removeAll() 
      // populate array 
      for eachPost in posts! 
      { 
       if self.objects.count < self.objectsPerPage 
       { 
        self.objects.append(eachPost as! PFObject) 
       } 
      } 
      // reload and send back it has finished 
      self.tableView.reloadData() 
      result(done: true) 
      self.tableView.backgroundColor = UIColor(patternImage: UIImage(named: "pattern_clear_white.pdf")!) 
      // remove uiview 
      UIView.animateWithDuration(0.5, delay: 0, options: UIViewAnimationOptions.CurveEaseInOut, animations: {() -> Void in 
       if let viewWithTag = self.view.viewWithTag(101) 
       { 
        viewWithTag.alpha = 0 
       } 
       }, completion: nil) 
     } 
    } 
} 

// refresh existing content 
func tableViewRefresh(result: (done: Bool) -> Void){ 
    var query = PFQuery(className: "Posts") 
    query = segueDataChecker() 
    // limit objects 
    query.limit = self.objects.count 
    // save number of objects already loaded 
    let actualNumberOfPosts = self.objects.count 
    // get objects 
    query.findObjectsInBackgroundWithBlock { (posts: [AnyObject]?, error: NSError?) -> Void in 
     if error != nil 
     { 
      result(done: true) 
      let alertView = createDefaultAlertError(message: "\(error!.localizedDescription.capitalizedString)", actions: [UIAlertAction(title: "Ok", style: UIAlertActionStyle.Cancel, handler: nil)]) 
      self.presentViewController(alertView, animated: true, completion: nil) 
     } 
     else 
     { 
      // clean array 
      self.objects.removeAll() 
      // populate array with same updated objects 
      for eachPost in posts! 
      { 
       if self.objects.count < actualNumberOfPosts 
       { 
        self.objects.append(eachPost as! PFObject) 
       } 
      } 
      // reload and send back it has finished 
      self.tableView.reloadData() 
      result(done: true) 
     } 
    } 
} 

// load next results 
func tableViewLoadMore(result: (done: Bool) -> Void){ 
    var query = PFQuery(className: "Posts") 
    query = segueDataChecker() 
    // skip objects already loaded 
    query.skip = self.objects.count; // skip the first 20 results 
    // limit results to next page amount 
    query.limit = objectsPerPage 
    // save number of objects already loaded 
    let actualNumberOfPosts = self.objects.count 
    // get objects 
    query.findObjectsInBackgroundWithBlock { (posts: [AnyObject]?, error: NSError?) -> Void in 
     if error != nil 
     { 
      result(done: true) 
      let alertView = createDefaultAlertError(message: "\(error!.localizedDescription.capitalizedString)", actions: [UIAlertAction(title: "Ok", style: UIAlertActionStyle.Cancel, handler: nil)]) 
      self.presentViewController(alertView, animated: true, completion: nil) 
     } 
     else 
     { 
      // if there anything new 
      if posts?.count != 0 
      { 
       // populate array with new objects 
       for eachPost in posts! 
       { 
        if (self.objects.count < self.objectsPerPage + actualNumberOfPosts) 
        { 
         self.objects.append(eachPost as! PFObject) 
        } 
       } 
       // reload and send back it has finished 
       self.tableView.reloadData() 
       result(done: true) 
       // slide tablview one result down 
       let newIndexPath = NSIndexPath(forRow: actualNumberOfPosts, inSection: 0) 
       self.tableView.scrollToRowAtIndexPath(newIndexPath , atScrollPosition: UITableViewScrollPosition.None, animated: true) 
      } 
       // if there is nothing new 
      else 
      { 
       result(done: true) 
      } 
     } 
    } 
}