【发布时间】：2016-03-30 11:06:39
【问题描述】：
斯威夫特
我正在努力做到这一点，因此当您拉动以刷新 tableview 时，它会使用存储在 Parse.com 上的数据更新 tableview
我对此进行了研究，看来我需要使用loadObjects()
当我把它放进去时，它说：“使用未解析的标识符'loadObjects'
不确定这是否是我需要的..
这是我的 ViewController.swift
import UIKit
import Parse
import Bolts
import ParseUI
class EventsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
var timer: NSTimer!
var isAnimating = false
var currentColorIndex = 0
var currentLabelIndex = 0
var customView: UIView!
var labelsArray: Array<UILabel> = []
var refreshControl: UIRefreshControl!
var testArray = [String]()
var subArray = [String]()
@IBOutlet weak var tableview: UITableView!
@IBOutlet weak var webView: UIWebView!
override func viewDidLoad() {
super.viewDidLoad()
tableview.delegate = self
tableview.dataSource = self
refreshControl = UIRefreshControl()
tableview.addSubview(refreshControl)
loadCustomRefreshContents()
//refreshControl colors
refreshControl.backgroundColor = UIColor.clearColor() //color of background
refreshControl.tintColor = UIColor.clearColor() //color of indicator
let query = PFQuery(className: "events")
let runkey = query.orderByDescending("eventTitle")
runkey.findObjectsInBackgroundWithBlock {
(objects: [PFObject]?, error:NSError?) -> Void in
if error == nil {
if let objects = objects as [PFObject]! {
for object in objects {
let load = object.objectForKey("eventTitle") as! String
self.testArray.append(load)
let subload = object.objectForKey("date") as! String
self.subArray.append(subload)
print(self.testArray)
}
}
} else {
print("error:\(error!) \(error!.userInfo)")
}
}
sleep(3)
do_table_refresh()
loadViewIfNeeded()
loadObjects()
/*let url = NSURL(string: "https://m.facebook.com/CathedralCityMunicipal")
let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {
(data, response, error) in
if error == nil {
let urlContent = NSString(data: data!, encoding: NSUTF8StringEncoding)
print(urlContent)
dispatch_async(dispatch_get_main_queue()) {
self.webView.loadHTMLString(urlContent! as String, baseURL: nil)
}
}
}
task.resume()*/
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func do_table_refresh() {
dispatch_async(dispatch_get_main_queue()) {
self.tableview.reloadData()
return
}
}
func tableView(tableView:UITableView!, numberOfRowsInSection section:Int) -> Int {
return testArray.count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("eventcell", forIndexPath: indexPath) as! EventTableViewCell
cell.title.text = self.testArray[indexPath.row]
cell.subTitle.text = self.subArray[indexPath.row]
return cell
}
//refreshes tableview; starts refresh
func loadCustomRefreshContents() {
let refreshContents = NSBundle.mainBundle().loadNibNamed("RefreshControl", owner: self, options: nil)
customView = refreshContents[0] as! UIView
customView.frame = refreshControl.bounds
for var i=0; i<customView.subviews.count; ++i {
labelsArray.append(customView.viewWithTag(i + 1) as! UILabel)
}
refreshControl.addSubview(customView)
do_table_refresh()
}
//stops refresh
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
do_table_refresh()
if refreshControl.refreshing {
if !isAnimating {
doSomething()
animateRefreshStep1()
self.do_table_refresh()
}
}
}
//cycles through colors
func getNextColor() -> UIColor {
var colorsArray: Array<UIColor> = [UIColor.magentaColor(), UIColor.brownColor(), UIColor.yellowColor(), UIColor.redColor(), UIColor.greenColor(), UIColor.blueColor(), UIColor.orangeColor()]
if currentColorIndex == colorsArray.count {
currentColorIndex = 0
}
let returnColor = colorsArray[currentColorIndex]
++currentColorIndex
return returnColor
}
func doSomething() {
timer = NSTimer.scheduledTimerWithTimeInterval(4.0, target: self, selector: "endOfWork", userInfo: nil, repeats: true)
self.do_table_refresh()
}
func endOfWork() {
refreshControl.endRefreshing()
self.do_table_refresh()
timer.invalidate()
timer = nil
}
//first part of animation
func animateRefreshStep1() {
isAnimating = true
UIView.animateWithDuration(0.1, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.labelsArray[self.currentLabelIndex].transform = CGAffineTransformMakeRotation(CGFloat(M_PI_4))
self.labelsArray[self.currentLabelIndex].textColor = self.getNextColor()
}, completion: { (finished) -> Void in
UIView.animateWithDuration(0.05, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.labelsArray[self.currentLabelIndex].transform = CGAffineTransformIdentity
self.labelsArray[self.currentLabelIndex].textColor = UIColor.blackColor()
}, completion: { (finished) -> Void in
++self.currentLabelIndex
if self.currentLabelIndex < self.labelsArray.count {
self.animateRefreshStep1()
}
else {
self.animateRefreshStep2()
}
})
})
}
//second part of animation
func animateRefreshStep2() {
UIView.animateWithDuration(0.35, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.labelsArray[0].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[1].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[2].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[3].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[4].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[5].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[6].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[7].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[8].transform = CGAffineTransformMakeScale(1.5, 1.5)
self.labelsArray[9].transform = CGAffineTransformMakeScale(1.5, 1.5)
}, completion: { (finished) -> Void in
UIView.animateWithDuration(0.25, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.labelsArray[0].transform = CGAffineTransformIdentity
self.labelsArray[1].transform = CGAffineTransformIdentity
self.labelsArray[2].transform = CGAffineTransformIdentity
self.labelsArray[3].transform = CGAffineTransformIdentity
self.labelsArray[4].transform = CGAffineTransformIdentity
self.labelsArray[5].transform = CGAffineTransformIdentity
self.labelsArray[6].transform = CGAffineTransformIdentity
self.labelsArray[7].transform = CGAffineTransformIdentity
self.labelsArray[8].transform = CGAffineTransformIdentity
self.labelsArray[9].transform = CGAffineTransformIdentity
}, completion: { (finished) -> Void in
if self.refreshControl.refreshing {
self.currentLabelIndex = 0
self.animateRefreshStep1()
}
else {
self.isAnimating = false
self.currentLabelIndex = 0
for var i=0; i<self.labelsArray.count; ++i {
self.labelsArray[i].textColor = UIColor.blackColor()
self.labelsArray[i].transform = CGAffineTransformIdentity
}
}
})
})
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
我试过让do_table_refresh()函数在刷新结束后运行，但是tableview没有更新。我也尝试过使用self.tableview.reloadData()，但也不起作用。
我不确定我做错了什么，非常感谢任何帮助！
如有任何其他信息，请随时向我询问！
感谢您的宝贵时间！
【问题讨论】：
-
也许这就是你所缺少的：#import
-
@ivan 在我这样做时给了我错误。
标签： swift parse-platform pull-to-refresh