我正在学习 Swift 并尝试使用 iOS8 Swift Dev's Cookbook 中的代码,但是我很难使用 viewDidLoad
函数中的自定义函数生成的变量来将该产品放入UILabel
对象。
顶部的可选phone
与phone
创建的peoplePickerNavigationController
函数不对应。因此,labelPhone 对象不显示任何内容,而是显示从 peoplePickerNavigationController
函数中选择的电话号码。
如何从一个函数中获取变量/常量到 viewDidLoad
函数中的对象,以便它可以在 UI 中使用?
作为引用,我的 Storyboard 包含一个 UIButton
“联系人”,点击它可以执行 peoplePickerNavigationController
功能。
import UIKit
import AddressBookUI
class ViewController: UIViewController, ABPeoplePickerNavigationControllerDelegate {
var phone : String?
//I'm trying to pull up the phone variable down below, but the two are not corresponding. The optional above is what appears in the `labelPhone` object below rather than the contents of the phone way below.
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var labelPhone = UILabel(frame: CGRectMake(0, 0, 200, 21))
labelPhone.center = CGPointMake(160, 284)
labelPhone.textAlignment = NSTextAlignment.Center
labelPhone.text = phone
self.view.addSubview(labelPhone)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
let personPicker: ABPeoplePickerNavigationController
required init(coder aDecoder: NSCoder) {
personPicker = ABPeoplePickerNavigationController()
super.init(coder: aDecoder)
personPicker.peoplePickerDelegate = self
}
func peoplePickerNavigationControllerDidCancel(peoplePicker: ABPeoplePickerNavigationController!) {
/* Mandatory */
}
func peoplePickerNavigationController(peoplePicker: ABPeoplePickerNavigationController!, didSelectPerson person: ABRecord!, property: ABPropertyID, identifier: ABMultiValueIdentifier) {
/* A property in a person was picked */
}
@IBAction func performPickPerson(sender : AnyObject) {
self.presentViewController(personPicker, animated: true, completion: nil)
}
func peoplePickerNavigationController(peoplePicker: ABPeoplePickerNavigationController!, didSelectPerson person: ABRecordRef!) {
/* Do we know which picker it is? */
if peoplePicker != personPicker{
return
}
/* Get all phone numbers this user has */
let phones: ABMultiValueRef = ABRecordCopyValue(person, kABPersonPhoneProperty).takeRetainedValue()
let countOfPhones = ABMultiValueGetCount(phones)
for index in 0..<countOfPhones{
let phone = ABMultiValueCopyValueAtIndex(phones, index).takeRetainedValue() as String
println(phone)
}
}
}
谢谢<3
当前代码:
import UIKit
import AddressBookUI
class ViewController: UIViewController, ABPeoplePickerNavigationControllerDelegate {
var phone : String?
var labelPhone: UILabel?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
labelPhone = UILabel(frame: CGRectMake(0, 0, 200, 21))
labelPhone!.center = CGPointMake(160, 284)
labelPhone!.textAlignment = NSTextAlignment.Center
labelPhone!.text = phone
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
let personPicker: ABPeoplePickerNavigationController
required init(coder aDecoder: NSCoder) {
personPicker = ABPeoplePickerNavigationController()
super.init(coder: aDecoder)
personPicker.peoplePickerDelegate = self
}
func peoplePickerNavigationControllerDidCancel(peoplePicker: ABPeoplePickerNavigationController!) {
/* Mandatory */
}
func peoplePickerNavigationController(peoplePicker: ABPeoplePickerNavigationController!, didSelectPerson person: ABRecord!, property: ABPropertyID, identifier: ABMultiValueIdentifier) {
/* A property in a person was picked */
}
@IBAction func performPickPerson(sender : AnyObject) {
self.presentViewController(personPicker, animated: true, completion: nil)
}
func peoplePickerNavigationController(peoplePicker: ABPeoplePickerNavigationController!, didSelectPerson person: ABRecordRef!) {
/* Do we know which picker it is? */
if peoplePicker != personPicker{
return
}
/* Get all phone numbers this user has */
let phones: ABMultiValueRef = ABRecordCopyValue(person, kABPersonPhoneProperty).takeRetainedValue()
let countOfPhones = ABMultiValueGetCount(phones)
for index in 0..<countOfPhones{
//let phone = ABMultiValueCopyValueAtIndex(phones, index).takeRetainedValue() as String
phone = ABMultiValueCopyValueAtIndex(phones, index).takeRetainedValue() as? String
labelPhone!.text = phone
println(phone)
}
}
}
最佳答案
首先,viewDidLoad 只在 View 加载时执行一次。要更改标签的文本,您需要执行以下操作:
var phone : String?
var labelPhone: UILabel?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
labelPhone = UILabel(frame: CGRectMake(0, 0, 200, 21))
labelPhone.center = CGPointMake(160, 284)
labelPhone.textAlignment = NSTextAlignment.Center
self.view.addSubview(labelPhone)
}
func peoplePickerNavigationController(peoplePicker: ABPeoplePickerNavigationController!, didSelectPerson person: ABRecordRef!) {
// Got the phone
phone = ABMultiValueCopyValueAtIndex(phones, index).takeRetainedValue() as String
labelPhone.text = phone
}
关于ios - 在 Swift 中使用来自单独函数的变量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28121978/