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[英]NSNotification is being called multiple times from UITabBarController
[英]NSNotification getting called multiple times
我的didFinishLaunchingWithOptions中有以下代碼
NotificationCenter.default.addObserver(
self,
selector: #selector(addressBookDidChange),
name: NSNotification.Name.CNContactStoreDidChange,
object: nil)
這是它調用的方法
@objc func addressBookDidChange(notification: NSNotification){
self.processContacts()
}
這是通知被刪除
func applicationWillTerminate(_ application: UIApplication) {
NotificationCenter.default.removeObserver(NSNotification.Name.CNContactStoreDidChange)
}
問題是,當我通過以下方法添加新聯系人時,addressBookDidChange之后會被調用多次,而不僅僅是一次
func addContact(contact:ContactObject) {
let store = CNContactStore()
let contactToAdd = CNMutableContact()
contactToAdd.givenName = contact.firstName
contactToAdd.familyName = contact.lastName
contactToAdd.organizationName = contact.company
for case let contactNumber as PhoneNumberObject in contact.phoneNumbers!{
let mobileNumber = CNPhoneNumber(stringValue: contactNumber.number)
contactToAdd.phoneNumbers.append(CNLabeledValue(label: contactNumber.type.getCNLabelValue(), value: mobileNumber))
}
if let image = contact.image {
contactToAdd.imageData = UIImagePNGRepresentation(image)
}
let saveRequest = CNSaveRequest()
saveRequest.add(contactToAdd, toContainerWithIdentifier: nil)
do {
try store.execute(saveRequest)
} catch {
NSLog("Error adding contact \(contact.firstName) \(contact.lastName) : \(error)")
}
}
我如何才能只添加一次聯系人就調用一次通知?
我認為基於委托設置通知發布不是一個好主意,因此應該做的是從委托檢查條件中發布通知,是否添加了通知更改。
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