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")
}
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