Swift 正在主线程上执行长时间运行的操作
这是从Parse.com获取内容的代码：Swift 正在主线程上执行长时间运行的操作,swift,Swift,这是从Parse.com获取内容的代码： func QueryImagesFromParse(){ var query = PFQuery(className: "Posts") query.orderByDescending("createdAt") query.findObjectsInBackgroundWithBlock { (objects:[AnyObject]?, error:NSError?) -> Void in
func QueryImagesFromParse(){
var query = PFQuery(className: "Posts")
query.orderByDescending("createdAt")
query.findObjectsInBackgroundWithBlock { (objects:[AnyObject]?, error:NSError?) -> Void in
if error == nil
{
if let newObjects = objects as? [PFObject] {
for oneobject in newObjects {
var text = oneobject["imageText"] as! String
var username = oneobject["username"] as! String
var time = oneobject.createdAt
var userImageFile = oneobject["imageFile"] as! PFFile
userImageFile.getDataInBackgroundWithBlock({ (imageData:NSData?, error:NSError?) -> Void in
if error == nil {
let newImage = UIImage(data: imageData!)
var OneBigObject = Details(username: username, text: text, CreatedAt: time!, image: newImage!)
self.arrayOfDetails.append(OneBigObject)
self.collectionView.reloadData()
}
})
let imageData = userImageFile.getData()
}
}
}
}
}
让imageData=userImageFile.getData（）