id值= [[错误userInfo] objectForKey：AVErrorRecordingSuccessfullyFinishedKey]到Swift

Question

我正在尝试在swift中构建一个相机应用程序，我在互联网上搜索了一些代码并找到了这行代码。

(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error {

NSLog(@"didFinishRecordingToOutputFileAtURL - enter");

BOOL RecordedSuccessfully = YES;
if ([error code] != noErr)
{
    // A problem occurred: Find out if the recording was successful.
    id value = [[error userInfo] objectForKey:AVErrorRecordingSuccessfullyFinishedKey];
    if (value)
    {
        RecordedSuccessfully = [value boolValue];
    }
}
...

如何在swift中编写 id value = [[error userInfo] objectForKey：AVErrorRecordingSuccessfullyFinishedKey]; ？

我尝试：

value = error.userInfo[AVErrorRecordingSuccessfullyFinishedKey]

但它显示了这个错误：'NSString无法转换为'DictionaryIndex'

Answer 1

所以，你可以用这种方式编写这行代码：

var value: AnyObject! = error.userInfo[AVErrorRecordingSuccessfullyFinishedKey]

UPD：

根据此警告，您正在使用小于5的xCode测试版：

  

＆＃39; NSString无法转换为＆＃39; DictionaryIndex＆＃39;

更新它！