【发布时间】：2017-11-11 06:19:50
【问题描述】：
我的应用程序的用户可以发布帖子，当他们发布帖子时，他们可以上传多张图片。我遇到的问题是在我的应用程序中查看图片。这是该节点在 Firebase 中的外观：
},
"-Kjy7sfa7pWmlawqWTsN" : {
"image" : "CfHWd.jpg",
"imageFive" : "30fQI.jpg",
"imageFour" : "uOnVB.jpg",
"imageThree" : "eHMOY.jpg",
"imageTwo" : "jQCLu.jpg",
}
这就是我从 firebase 中检索它们的方式：
if let stringImage = self.imageNames {
let imageRef = storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage)")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
self.ImageOne = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
if let stringImages = self.imagesTwo {
let imageRefs = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImages)")
imageRefs.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
self.ImageTwo = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
})}
if let stringImage3 = self.imagesThree {
let imageRef = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage3)")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
self.ImageThree = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
})}
if let stringImage4 = self.imagesFour {
let imageRef = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage4)")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
self.ImageFour = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
})}
if let stringImage5 = self.imagesFive {
AppDelegate.instance().showActivityIndicator()
let imageRef = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage5)")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
AppDelegate.instance().dismissActivityIndicator()
self.ImageFive = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
})}
})}
现在我的问题是在一个名为 icarousel 的特殊视图中显示它们。我成功地能够在 icarousel 中显示我的资产文件夹中的图像：
var imageArray : NSMutableArray = NSMutableArray()
@IBOutlet weak var carouselView: iCarousel!
override func viewDidLoad() {
super.viewDidLoad()
self.carouselView.delegate = self
self.carouselView.dataSource = self
imageArray = ["imageOne", "imageTwo", "imageThree"]
carouselView.type = .wheel
carouselView.reloadData()
}
func carousel(_ carousel: iCarousel, viewForItemAt index: Int, reusing view: UIView?) -> UIView {
var imageView: UIImageView!
if view == nil {
imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 100, height: 130))
imageView.contentMode = .scaleAspectFit
}else{
imageView = view as! UIImageView
}
imageView.image = UIImage(named: "\(imageArray.object(at: index))")
return imageView
}
public func numberOfItems(in carousel: iCarousel) -> Int {
return imageArray.count
}
但是，我尝试从 firebase 检索所有图像并将它们放入一个数组中：
imageArray = [self.ImageOne, self.ImageTwo, self.ImageThree, self.ImageFour, self.ImageFive]
但它不起作用，我不确定我做错了什么 这是我从 firebase 设置 icarousel 的尝试：
var imageArray : NSMutableArray = NSMutableArray()
@IBOutlet var carouselView: iCarousel!
var ImageOne = UIImage()
var ImageTwo = UIImage()
var ImageThree = UIImage()
var ImageFour = UIImage()
var ImageFive = UIImage()
var images: NSArray! = []
override func viewDidLoad() {
super.viewDidLoad()
self.carouselView.delegate = self
self.carouselView.dataSource = self
if let stringImage = self.imageNames {
let imageRef = storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage)")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
self.ImageOne = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
if let stringImages = self.imagesTwo {
let imageRefs = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImages)")
imageRefs.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
self.ImageTwo = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
})}
if let stringImage3 = self.imagesThree {
let imageRef = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage3)")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
self.ImageThree = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
})}
if let stringImage4 = self.imagesFour {
let imageRef = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage4)")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
self.ImageFour = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
})}
if let stringImage5 = self.imagesFive {
AppDelegate.instance().showActivityIndicator()
let imageRef = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage5)")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
AppDelegate.instance().dismissActivityIndicator()
self.ImageFive = UIImage(data: data!)!
}else {
print("Error downloading image:" )
}
})}
})}
imageArray = [self.ImageOne, self.ImageTwo, self.ImageThree, self.ImageFour, self.ImageFive]
carouselView.type = .rotary
carouselView.reloadData()
}
func carousel(_ carousel: iCarousel, viewForItemAt index: Int, reusing view: UIView?) -> UIView {
var imageView: UIImageView!
if view == nil {
imageView = UIImageView(frame: CGRect(x: 20, y: 0, width: 230, height: 270))
imageView.backgroundColor = UIColor.lightGray
imageView.contentMode = .scaleAspectFit
imageView.clipsToBounds = true
carousel.clipsToBounds = true
}else{
imageView = view as! UIImageView
}
imageView.image = imageArray[index] as? UIImage;
print(imageArray)
return imageView
}
public func numberOfItems(in carousel: iCarousel) -> Int {
return imageArray.count
}
【问题讨论】：
-
在
carousel，设置图片为imageView.image = imageArray[index] -
if let stringImage = self.imageNames{}在哪里调用？既然应该有异步/后台进程，那么你调用carouselView.reloadData()的时候数组满了吗？ -
在 imageArray 中，您没有保存图像名称.. 但您正在保存图像.. 要么保存图像名称并将它们保存在本地以获得更好的性能.. 要么使用 @Wei Jay 的解决方案..
-
@WeiJay 我做到了，但还是不行
-
另外，下载图片是一个异步函数，图片准备好后记得调用
carouselView.reloadData()
标签： ios swift firebase firebase-realtime-database icarousel