Swift：访问OS X地址簿：＆＃34; ABPerson不能转换为ABPerson＆＃34;

Question

我正在访问OS X地址簿，如下所示：

if let book = ABAddressBook.sharedAddressBook() { 
    let people = book.people() as [ABPerson]
    for person in people {
        // Now I want to get the person's image to some variable
        ABPersonCopyImageData(person) // compile error
    }
}

Xcode称'ABPerson'不能转换为'ABPerson'。

这有什么问题？

提前致谢， 金