swift开发笔记23 BirthDays
2017-12-29 11:31 dengchaojie_learner 阅读(258) 评论(0) 编辑 收藏 举报@escaping
简单的介绍就是如果这个闭包是在这个函数结束前内被调用,就是非逃逸的即noescape。如果这个闭包是在函数执行完后才被调用,调用的地方超过了这函数的范围,所以叫逃逸闭包。
···未解决问题
NSPredicate.init(format: "birthday is nil", <#T##args: CVarArg...##CVarArg#>)
closure 闭包
try contactStore.enumerateContacts(with: CNContactFetchRequest.init(keysToFetch: keys as! [CNKeyDescriptor]), usingBlock: { (contact, pointer) in
if contact.birthday != nil && contact.birthday?.month == self.currentlySelectedMonthIndex {
contacts.append(contact)
}
})
if let homeEmail = HomeEmailTF.text {
let homeEmail = CNLabeledValue.init(label: CNLabelHome, value: homeEmail as NSString)
newContact.emailAddresses = [homeEmail]
}
let birthdayComponents = Calendar.current.dateComponents([Calendar.Component.year,Calendar.Component.month,Calendar.Component.day], from: datePick.date)
newContact.birthday = birthdayComponents
let saveRe = CNSaveRequest()
saveRe.add(newContact, toContainerWithIdentifier: nil)
try AppDelegate.appdelegate.contactStore.execute(saveRe)
try contactStore.enumerateContacts(with: CNContactFetchRequest.init(keysToFetch: keys as! [CNKeyDescriptor]), usingBlock: { (contact, pointer) in })
let predicate = CNContact.predicateForContacts(matchingName: self.tfield.text!)
let keys = [CNContactFormatter.descriptorForRequiredKeys(for: CNContactFormatterStyle.fullName),CNContactBirthdayKey,CNContactEmailAddressesKey] as [Any]
var contacts = [CNContact]()
var message: String!
do {
contacts = try AppDelegate.appdelegate.contactStore.unifiedContacts(matching: predicate, keysToFetch: keys as! [CNKeyDescriptor])
if contacts.count == 0 {
message = "No contacts were found matching the given name."
}
} catch {
message = "Unable to fetch contacts."
}