我正在使用带有滚动列表的UItableview。现在我有默认的“加载更多”按钮，一次加载10个对象。它破坏了界面。关于如何定制它的任何想法？尝试了一些事情，但我们没有运气。感谢
答案 0 :(得分：3)
尝试实现Parse提供的用于自定义“加载更多”单元格的方法：
// 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;
}
答案 1 :(得分：0)
在自定义方面，你可以用Parse控制器做很多事情。此控制器的动画似乎有点笨重。在使用具有最新IO 9的组件时，我也遇到了一堆内存错误。
出于同样的原因，我用以下内容替换了现有的Parse控制器。让我比标准的PARSE控制器更能控制动画和设计。
如果您想将tableview的顺序颠倒为看起来像信使应用，请查看here
添加全局变量
var objects = [PFObject(className: "Posts")]
var lockScrollSensor = false
let objectsPerPage = 10
添加到viewDidLoad
//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()
检测tableview滚动的位置，以调用刷新或下一页
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)
}
})
}
}
}
将加载PFObject阵列的刷新或下一页方法。
// 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)
}
}
}
}