//
// ViewController.swift
// Fashun
//
// Created by Alex Macleod on 20/10/14.
// Copyright (c) 2014 Alex Macleod. All rights reserved.
//
import UIKit
class ViewController: UIViewController, UICollectionViewDelegateFlowLayout, UICollectionViewDataSource {
var collectionView: UICollectionView?
var instanceOfCustomObject: CustomObject = CustomObject()
var accessToken: NSString!
var userDefaults: NSUserDefaults!
// the range represents integer values 0, 1, and 2
// the range now represents integer values 6, 7, and 8
let colorWheel = ColorWheel()
var photoCount: Int! = 0
var photos: UIImage! = UIImage()
// private let api = "d4984c8cfa78689bd066d82bec820fd5"
override func viewDidLoad() {
super.viewDidLoad()
userDefaults = NSUserDefaults.standardUserDefaults()
self.accessToken = userDefaults!.objectForKey("accessToken") as NSString
println(self.accessToken)
// instanceOfCustomObject.someProperty = "Hello World"
// var accessToken : NSString? = NSString(instanceOfCustomObject.accessToken)
// println(accessToken)
// instanceOfCustomObject.authorize()
// instanceOfCustomObject.simpleAuth()
// Do any additional setup after loading the view, typically from a nib.
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
// layout.sectionInset = UIEdgeInsets(top: 20, left: 0, bottom: 0, right: 0)
layout.itemSize = CGSize(width: 124, height: 124)
layout.minimumInteritemSpacing = 1.0
layout.minimumLineSpacing = 1.0
collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
collectionView!.dataSource = self
collectionView!.delegate = self
collectionView!.registerClass(Cell.self, forCellWithReuseIdentifier: "Cell")
collectionView!.backgroundColor = UIColor.whiteColor()
self.view.addSubview(collectionView!)
getData()
}
func getData() -> Void {
let baseUrl = NSURL(string:"https://api.instagram.com/v1/users/3/media/recent/?access_token=\(self.accessToken)")
let forcastUrl = NSURL(string: "", relativeToURL: baseUrl)
// let data = NSData(contentsOfURL: forcastUrl)
// println(data)
let sharedSession = NSURLSession.sharedSession()
let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(baseUrl, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in
// var urlContents = NSString.stringWithContentsOfURL(location, encoding: NSUTF8StringEncoding, error: nil)
// println(urlContents)
let dataObject = NSData(contentsOfURL: baseUrl)
// println(dataObject)
if (error == nil) {
let responseDictionary: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataObject, options: nil, error: nil) as NSDictionary
var currentResponse = responseDictionary.valueForKeyPath("data.images.standard_resolution.url") as NSArray
// println(currentResponse)
for url in currentResponse {
var urls: NSString = url as NSString
// println(images)
var photoUrls = NSURL.URLWithString(urls)
var err: NSError?
var imageData :NSData = NSData.dataWithContentsOfURL(photoUrls,options: NSDataReadingOptions.DataReadingMappedIfSafe, error: &err)
var photos = UIImage(data:imageData)
}
// println(currentResponse)
// self.currentResponse = currentResponse as NSArray
// self.photoCount = currentResponse.count as Int
// println(self.photoCount)
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.photoCount = currentResponse.count as Int!
self.collectionView!.reloadData()
// self.temperatureLabel.text = "\(currentWeather.temperature)"
// self.iconView.image = currentWeather.icon!
// self.currentTimeLabel.text = "At \(currentWeather.currentTime!) it is"
// self.humidityLabel.text = "\(currentWeather.humidity)"
// self.percipitationLabel.text = "\(currentWeather.precipProbability)"
// self.summeryLabel.text = "\(currentWeather.summary)"
//
// self.refreshActivityIndicator.stopAnimating()
// self.refreshActivityIndicator.hidden = true
//
// self.refreshButton.hidden = false
})
} else {
let networkIssueController = UIAlertController(title: "Error", message: "I got 99 problems but a bitch ain't one", preferredStyle: .ActionSheet)
let okButton = UIAlertAction(title: "OK", style: .Default, handler: nil)
networkIssueController.addAction(okButton)
let cancelButton = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
networkIssueController.addAction(cancelButton)
self.presentViewController(networkIssueController, animated: true, completion: nil)
dispatch_async(dispatch_get_main_queue(), { () -> Void in
//Stop refresh animation
// self.refreshActivityIndicator.stopAnimating()
// self.refreshActivityIndicator.hidden = true
// self.refreshButton.hidden = false
})
}
})
downloadTask.resume()
}
你可以在getData（）函数中看到我有for循环，循环遍历url数组，将这些url更改为UIImages并将其分配给名为photos的全局变量。
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as Cell
println(photos)
// cell.textLabel.text = "Text"
cell.imageView.image = photos
// cell.imageView.backgroundColor = colorWheel.randomColor()
return cell
}
}
你可以在这个collectionview函数中看到我试图通过将我的照片变量（我的url循环现在是UIImages）分配给imageView单元来显示图像。没有任何反应我只是在我的IOS模拟器上得到一个白色屏幕，但我的打印语句打印出我想要显示的所有图像！
提前致谢。
答案 0 :(得分：1)
在解析来自API的响应时，您需要将图像存储到NSMutableArray中。修改后的代码看起来与此类似：
var photos = NSMutableArray()
在分配接收到的图像数据的for循环中，您将拥有...
photos.addObject(UIImage(data:imageData))
在collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell函数中，您将加载图像：
cell.imageView.image = photos.objectAtIndex(indexPath.row)
您的集合视图现在应该开始显示图像，但是，您还应该考虑每个图像的加载所产生的延迟以及重新加载它们所需的时间。您应该考虑使用缓存类来缓存已下载的图像，以便用户在刷新或重新加载应用程序时不必重新加载它们。
一个很好的缓存库，可以按预期工作，是SAMCache，你可以在这里找到它：https://github.com/soffes/SAMCache。实施起来相当简单。