ios - swift realm::IncorrectThreadException:从不正确的线程访问的 Realm
<p><p>我创建了一个名为"file"的模型，使用 Realm Browser 看起来还不错:
<a href="/image/BqTYa.png" rel="noreferrer noopener nofollow"><img src="/image/BqTYa.png" alt="Realm Browser"/></a> </p>
<p>但是当我使用模型时，它会返回错误:
<code>libc++abi.dylib: 以未捕获的 Realm 类型异常终止::IncorrectThreadException:Realm 从不正确的线程访问。</code></p>
<p>在我的代码中，我在每个需要添加/更新的地方创建 Realm 对象:</p>
<pre><code>private var allFiles : Results<File>!
private var downloadingFiles : Results<File>! {
return self.allFiles.filter("completed = false")
}
private var downloadedFiles : Results<File>! {
return self.allFiles.filter("completed = true")
}
private var downloading = false
private var request: Alamofire.Request?
func download() {
let fileRealm = try! Realm()
allFiles = fileRealm.objects(File).sorted("updatedAt")
downloadFile()
}
private func downloadFile() {
if !self.downloading, let file = self.downloadingFiles.first where !file.completed {
self.reqForDownload(file)
}
}
private func reqForDownload(file: File) -> Void {
downloading = true
request = Alamofire
.download(.GET, file.url, destination: { (url, response) -> NSURL in
return NSURL(fileURLWithPath: file.filePath)
})
.progress { (bytesRead, totalBytesRead, totalBytesExpectedToRead) in
dispatch_async(dispatch_get_main_queue(), {
let variable = Float(totalBytesRead)/Float(totalBytesExpectedToRead)
debugPrint(variable)
})
}
.response { (request, response, data, error) in
if let error = error {
dispatch_async(dispatch_get_main_queue(), {
let fileRealm = try! Realm()
try! fileRealm.write({
file.completed = false
})
self.allFiles = fileRealm.objects(File).sorted("updatedAt")
})
if error.code == NSURLErrorCancelled {
debugPrint("Canceled download")
}
} else {
debugPrint("Downloaded file successfully")
dispatch_async(dispatch_get_main_queue(), {
let fileRealm = try! Realm()
try! fileRealm.write({
file.completed = true
})
self.allFiles = fileRealm.objects(File).sorted("updatedAt")
})
}
self.downloading = false
}
}
</code></pre>
<p>我是 Realm 的新手，但我知道 Realm 不是线程安全的，所以我尝试使用主线程中的对象作为我的代码，但错误仍然出现。请高人帮帮我，谢谢。</p>
<p><strong>我已将代码更新为@TimOliver 的<a href="https://github.com/realm/realm-cocoa/issues/4249#issuecomment-256185393" rel="noreferrer noopener nofollow">suggest</a> ，但它仍然响应相同的错误。</strong>新代码如下:</p>
<pre><code>private var allFiles : Results<File>!
private var downloadingFiles : Results<File>! {
return self.allFiles.filter("completed = false")
}
private var downloadedFiles : Results<File>! {
return self.allFiles.filter("completed = true")
}
private var downloading = false
private var request: Alamofire.Request?
func download() {
let fileRealm = try! Realm()
allFiles = fileRealm.objects(File).sorted("updatedAt")
downloadFile()
}
private func downloadFile() {
if !self.downloading, let file = self.downloadingFiles.first where !file.completed {
self.reqForDownload(file)
}
}
private func reqForDownload(file: File) -> Void {
downloading = true
request = Alamofire
.download(.GET, file.url, destination: { (url, response) -> NSURL in
return NSURL(fileURLWithPath: file.filePath)
})
.progress { (bytesRead, totalBytesRead, totalBytesExpectedToRead) in
dispatch_async(dispatch_get_main_queue(), {
let variable = Float(totalBytesRead)/Float(totalBytesExpectedToRead)
debugPrint(variable)
})
}
.response { (request, response, data, error) in
if let error = error {
let fileRealm = try! Realm()
try! fileRealm.write({
file.completed = false
})
self.allFiles = fileRealm.objects(File.self).sorted("updatedAt")
if error.code == NSURLErrorCancelled {
debugPrint("Canceled download")
}
} else {
debugPrint("Downloaded file successfully")
let fileRealm = try! Realm()
try! fileRealm.write({
file.completed = true
})
self.allFiles = fileRealm.objects(File.self).sorted("updatedAt")
}
self.downloading = false
}
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>就像我在评论中问的那样，如果你设置了异常断点，你可以准确地看到哪一行代码触发了 Realm 异常，这样你就可以跟踪 Realm 事务发生在哪个线程中，以及哪些对象正在交互用它。</p>
<p>如果我没记错的话，我相信在该方法的 <code>.response</code> 部分中调用的闭包默认不会在主线程上调用，但是您正在尝试修改 <code>file</code> 明确在主线程上查询的对象。</p>
<p>没有强制其中的每个闭包在主线程上调用，更合适的是 <a href="https://realm.io/docs/swift/latest/#primary-keys" rel="noreferrer noopener nofollow">primary key</a> <code>file</code> 对象中的属性，直接持有对主键值的引用，然后在需要更新时直接查询 <code>file</code> 对象的线程本地版本(即使用 <a href="https://realm.io/docs/swift/2.0.3/api/Classes/Realm.html#/s:FC10RealmSwift5Realm6objectu0_RxCS_6ObjectrFT6ofTypeMx13forPrimaryKeyq__GSqx_" rel="noreferrer noopener nofollow"><code>Realm.object(ofType: primaryKey:)</code></a> 方法。</p></p>
<p style="font-size: 20px;">关于ios - swift realm::IncorrectThreadException:从不正确的线程访问的 Realm ，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/40201917/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/40201917/
</a>
</p>
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