filemanager.createFileAtPath works not correctly

I try to create a PLIST-File with the NSFileManager and the method createFileAtPath. In the end, the file was created, it has the size of 0 Bytes, and i even can see the specific PLIST-Icon for that file in the Finder. But when i want to open it (for example with Xcode) it says:The data couldn't be read because it isn't in the correct format. I want to write to this file but when its not in the correct format i can't do this.

There is something wrong with the File-creation but i don't know what it is. I hope you can help me with this. Here is my code:

pListPath = NSURL(fileURLWithPath: reportsPath.path!).URLByAppendingPathComponent("myReports.plist", isDirectory: false)

                let data: NSData = NSData()
                var isDir: ObjCBool = false

                if fileManager.fileExistsAtPath(pListPath.path!, isDirectory: &isDir)
                    {
                        print("File already exits")
                    }
                    else
                    {
                        let success = fileManager.createFileAtPath(pListPath.path!, contents: data, attributes: nil)

                        print("Was file created?: \(success)")
                        print("plistPath: \(pListPath)")
                    }

reports.path = .../UserDir/.../Documents/Reports

Any help is highly appreciated.

Solution

filemanager.createFileAtPath works absolutely correctly,
but you're creating an empty file by writing an empty NSData object to disk.
NSData objects are not implicitly serialized to a property list.

Either use the NSPropertyListSerialization class or – simpler - write an empty dictionary to disk.

let dictionary = NSDictionary()
let success = dictionary.writeToURL(pListPath, atomically: true)
print("Was file created?: \(success)")
print("plistPath: \(pListPath)")

PS: you don't need to create an URL from an URL

pListPath = reportsPath.URLByAppendingPathComponent("myReports.plist", isDirectory: false)

but I recommend to use more descriptive variable names to distinguish String paths and NSURL e.g. pListURL and reportsURL