从服务器下载：“此应用程序正在修改自动布局引擎......” [重复]
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【中文标题】从服务器下载：“此应用程序正在修改自动布局引擎......” [重复]【英文标题】：Downloading from server: "This application is modifying the autolayout engine ..." [duplicate] 【发布时间】：2017-01-13 10:49:34 【问题描述】：结果包含特定日期的 1 个数据和任意数量的图像，我想下载任何特定联系人的记录，将数据保存在 datTable 中，并将图像保存在 imagetable 中。
但我收到警告
此应用程序正在从后台线程修改自动布局引擎，这可能会导致引擎损坏和奇怪的崩溃，这将在未来的版本中导致异常
我的代码是：
func downloadFunc()
let url = NSURL(string: "http://development.ssntpl.com/personal_record_api/downloaddescription.php");
let request = NSMutableURLRequest(URL:url!)
request.HTTPMethod = "POST"
let post:NSString = "user_id=\(id)&month=True&date=\(Month)&email=\(Email)"
print(post)
request.HTTPBody = post.dataUsingEncoding(NSUTF8StringEncoding)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request)
data, response, error in
if error != nil
print("error is \(error)")
return;
//parsing the response
do
//converting response to NSDictionary
let myJSON = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary
//print("DOWNLOADED DATA")
//print(myJSON!)
//parsing the json
if let parseJSON = myJSON
let Status = parseJSON["status"] as! Int
let Code = parseJSON["code"] as! Int
//print("status:\(Status)")
//print("code:\(Code)")
if (Status == 1)
let Result = parseJSON["result"]!
//print("Result=\(Result)")
//print("CHECKOUT")
for res in Result as! NSArray
let date = res["date"] as! String
let data = res["data"] as! String
print("data")
print(data)
if (data != "")
//ModelManager.sharedInstance.insertingRecordDataToDatabaseAfterDownload(self.id, email: self.Email, createdOn: date, record: data)
//function for Saving the DataRecords into the Database
let URL = try! NSFileManager.defaultManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil , create: false).URLByAppendingPathComponent("PersonalRecordAppDataBase.sqlite")
guard let recordDB = FMDatabase (path : URL.path) else
print("unable to create the database")
return
print(URL)
guard recordDB.open()
else
print("Database is not open or unable to connect")
return
do
try! recordDB.executeUpdate ("create table IF NOT EXISTS recordDataTable (ID integer, Email text, createdOn TEXT, updatedOn TEXT, Record text, Lastseen TEXT)" , values: nil);
try! recordDB.executeUpdate ("insert into recordDataTable (ID, Email, createdOn, updatedOn, Record, Lastseen) values(?,?,?,?,?,?)", values : [self.id, self.Email, date, self.Current! , data, ""])
catch let error as NSError
print("failed: \(error.localizedDescription)")
recordDB.close()
let image = res["images"] as! NSArray
print(image.count)
//print(image)
//while (image.next != nil)
self.lastComponentArray.removeAll()
for item in image
if item as! String != ""
//print("image : \(image)")
//print("CHECKEDIN")
//print(image)
print(item)
let url = NSURL(string: item as! String)
let request = NSURLRequest(URL: url!)
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue())
(response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in
let imagedata = UIImage(data: data!)
let lastComponent = url?.lastPathComponent
//print("itemLASTCOMPONENT = \(lastComponent!)")
self.lastComponentArray.append(lastComponent!)
//print(self.lastComponentArray)
//ModelManager.sharedInstance.insertingRecordImagesToDatabaseAfterDownload(self.id, email: self.Email, createdOn: date, lastComponent: lastComponent!)
// Saving images to the Document Directory
let fileManager = NSFileManager.defaultManager()
let paths = (NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as NSString).stringByAppendingPathComponent("/\(lastComponent!)")
print("Imagepaths=\(paths)")
let imageData = UIImageJPEGRepresentation(imagedata!, 0.2)
fileManager.createFileAtPath(paths as String, contents: imageData, attributes: nil)
//function for Saving the RecordImages into the Database
let URL = try! NSFileManager.defaultManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil , create: false).URLByAppendingPathComponent("PersonalRecordAppDataBase.sqlite")
guard let recordDB = FMDatabase (path : URL.path) else
print("unable to create the database")
return
print(URL)
guard recordDB.open()
else
print("Database is not open or unable to connect")
return
do
try recordDB.executeUpdate("create table IF NOT EXISTS recordImagesTable (ID integer, Email text, createdOn TEXT, updatedOn TEXT, recordImages NSDate)" , values: nil);
try! recordDB.executeUpdate ("insert into recordImagesTable (ID,Email,createdOn, updatedOn, recordImages) values(?,?,?,?,?)", values : [self.id, self.Email, date, self.Current!, lastComponent!, ""])
catch let error as NSError
print("failed: \(error.localizedDescription)")
recordDB.close()
self.tableView.reloadData()
// print("lastComponentArray")
//print(self.lastComponentArray)
print("save to database")
// ModelManager.sharedInstance.insertingRecordImagesToDatabaseAfterDownload(self.id, email: self.Email, createdOn: date, lastComponent: self.lastComponentArray)
//showing the AlertView that Records has been Downloaded
let A = UIAlertController(title: "Done!!!", message: "Record downloaded", preferredStyle: .Alert)
let B = UIAlertAction(title: "ok", style:UIAlertActionStyle.Default, handler: nil)
A.addAction(B)
self.presentViewController(A, animated: true, completion: nil)
if (Status == 0)
print("No data for Selected month")
catch
print(error)
//executing the task
task.resume()
【问题讨论】：
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue())。为什么要在 mainQueue 中发送异步请求？
***.com/a/50567382/8334818这也是可能的解决方案
【参考方案1】：
要更新 UI 你应该调用主线程
把这段代码放在你更新 ui 的地方
快速 3 路
DispatchQueue.main.async
//here you can update UI
快速 2 路
dispatch_async(dispatch_get_main_queue())
//here you can update UI
【讨论】：
非常感谢......它对我有用。【参考方案2】：这仅仅意味着您正在尝试在后台线程中进行 UI 更改。在主线程中执行。
您的 UI 相关代码：
let A = UIAlertController(title: "Done!!!", message: "Record downloaded", preferredStyle: .Alert)
let B = UIAlertAction(title: "ok", style:UIAlertActionStyle.Default, handler: nil)
A.addAction(B)
self.presentViewController(A, animated: true, completion: nil)
和
self.tableView.reloadData()
在主线程中做
对于 Swift 2：
dispatch_async(dispatch_get_main_queue(),
self.tableView.reloadData()
)
dispatch_async(dispatch_get_main_queue(),
let A = UIAlertController(title: "Done!!!", message: "Record downloaded", preferredStyle: .Alert)
let B = UIAlertAction(title: "ok", style:UIAlertActionStyle.Default, handler: nil)
A.addAction(B)
self.presentViewController(A, animated: true, completion: nil)
)
对于 Swift 3：
DispatchQueue.main.async
let A = UIAlertController(title: "Done!!!", message: "Record downloaded", preferredStyle: .Alert)
let B = UIAlertAction(title: "ok", style:UIAlertActionStyle.Default, handler: nil)
A.addAction(B)
self.presentViewController(A, animated: true, completion: nil)
DispatchQueue.main.async
self.tableView.reloadData()
请随时提出修改建议以使其更好:)
【讨论】：
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