Swift iOS9新联系人框架 - 如何仅检索具有有效电子邮件地址的CNContact？ [英] Swift iOS9 New Contacts Framework - How to retrieve only CNContact that has a valid email address?

问题描述

在最新的iOS9联系人框架中，如何仅检索具有有效电子邮件地址的CNContact？

In the latest Contacts framework for iOS9, how to retrieve only CNContact that has a valid email address?

当前代码：

func getContacts() -> [CNContact] {
    let contactStore = CNContactStore()
    let predicate: NSPredicate = NSPredicate(format: "")
    let keysToFetch = [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactEmailAddressesKey]

    do {
        return try contactStore.unifiedContactsMatchingPredicate(predicate, keysToFetch: keysToFetch)
    } catch {
        return []
    }
}

推荐答案

目前（iOS 9.0）似乎没有谓词（参见CNContact Predicates ）可通过电子邮件地址过滤联系人！

For now (iOS 9.0) it seems that no predicates (see CNContact Predicates) are available to filter contacts by email address!

您无法编写自定义谓词来过滤联系人，因为文档说：
请注意，Contacts framewo不支持泛型谓词和复合谓词rk

You can't write a custom predicate to filter contacts, as the doc says: "Note that generic and compound predicates are not supported by the Contacts framework"

但当然你可以手动完成它，我给你看一个使用快速枚举的例子：

But of course you can do it "manually", I show you an example using fast enumeration:

let contactStore = CNContactStore()
fetchRequest.unifyResults = true //True should be the default option
do {
    try contactStore.enumerateContactsWithFetchRequest(CNContactFetchRequest(keysToFetch: [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactEmailAddressesKey])) {
        (contact, cursor) -> Void in
        if (!contact.emailAddresses.isEmpty){
            //Add to your array
        }
    }
}
catch{
    print("Handle the error please")
}

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