在iOS9最新的联系人框架中,如何只检索具有有效电子邮件地址的CNContact ?
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 []
}
}
目前(iOS 9.0)似乎没有谓词(参见CNContact谓词)可用于通过电子邮件地址过滤联系人!
你不能写一个自定义谓词来过滤联系人,正如文档所说:
"注意,Contacts框架不支持通用谓词和复合谓词"当然你也可以"手动"做,我给你看一个使用快速枚举的例子:
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")
}
注意:
在较新版本的Swift中,对contactStore.enumerateContactsWithFetchRequest
的调用需要更新为:
try contactStore.enumerateContacts(with: CNContactFetchRequest(keysToFetch: [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactEmailAddressesKey] as [CNKeyDescriptor])) {