尝试使用Swift从Parse显示图像时出现问题

本文介绍了尝试使用Swift从Parse显示图像时出现问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试使用swift显示来自解析的图像.这是我的代码:

I am trying to display an image from parse using swift. This is my code:

var query = PFQuery(className: "Maps") query.getObjectInBackgroundWithId("1234asdf3456") { (object: PFObject?, error: NSError?) -> Void in if error == nil { println(object) var objectAsPF = object as PFObject! let file = objectAsPF["imageFile"] as! PFFile file.getDataInBackgroundWithBlock { (imageData:NSData?, error:NSError?) -> Void in if error == nil { if let imageData = imageData { let map:UIImage = UIImage(data: imageData)! self.MapView.image = map println("success") } } } } else { println(error) } }

我在println("success")处设置了一个断点，并检查了变量值，一切都很好，直到我尝试将imageData转换为UIImage为止.有提示吗?

I set a breakpoint at println("success") and i checked the variable values and everything is fine until i try to convert imageData to UIImage. Any tips?

推荐答案

使用此代码从解析中撤消图像，然后将其从PFFile转换为UIImage ...

Use this code to retreave images from parse then convert it from a PFFile to a UIImage...

var query = PFQuery(className:"Maps") query.findObjectsInBackgroundWithBlock { (objects: [AnyObject]?, error: NSError?) -> Void in if error == nil { // The find succeeded. self.scored = objects!.count // Do something with the found objects if let objects = objects as? [PFObject] { for object in objects { let userImageFile = object["imageFile"] as! PFFile userImageFile.getDataInBackgroundWithBlock { (imageData: NSData?, error: NSError?) -> Void in if error == nil { if let imageData = imageData { let image = UIImage(data:imageData) if image != nil { self.imageArray.append(image!) } } } } } } } else { // Log details of the failure println("Error: \(error!) \(error!.userInfo!)") } dispatch_async(dispatch_get_main_queue()) { println("Finished Loading Image") }