如何在默认的通知中心中添加一个观察者?我试图移植这行代码，当电池电量变化时发送通知。
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(batteryLevelChanged:) name:UIDeviceBatteryLevelDidChangeNotification object:nil];
当前回答
Swift 4.0 & Xcode 9.0+:
发送(Post)通知:
NotificationCenter.default.post(name: Notification.Name("NotificationIdentifier"), object: nil)
OR
NotificationCenter.default.post(name: Notification.Name("NotificationIdentifier"), object: nil, userInfo: ["Renish":"Dadhaniya"])
得到(获得)通知:
NotificationCenter.default.addObserver(self, selector: #selector(self.methodOfReceivedNotification(notification:)), name: Notification.Name("NotificationIdentifier"), object: nil)
接收到的通知的函数方法处理程序:
@objc func methodOfReceivedNotification(notification: Notification) {}
Swift 3.0 & Xcode 8.0+:
发送(Post)通知:
NotificationCenter.default.post(name: Notification.Name("NotificationIdentifier"), object: nil)
得到(获得)通知:
NotificationCenter.default.addObserver(self, selector: #selector(YourClassName.methodOfReceivedNotification(notification:)), name: Notification.Name("NotificationIdentifier"), object: nil)
接收到的通知的方法处理程序:
func methodOfReceivedNotification(notification: Notification) {
// Take Action on Notification
}
删除通知:
deinit {
NotificationCenter.default.removeObserver(self, name: Notification.Name("NotificationIdentifier"), object: nil)
}
Swift 2.3和Xcode 7:
发送(Post)通知
NSNotificationCenter.defaultCenter().postNotificationName("NotificationIdentifier", object: nil)
得到(获得)通知
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(YourClassName.methodOfReceivedNotification(_:)), name:"NotificationIdentifier", object: nil)
接收的通知的方法处理程序
func methodOfReceivedNotification(notification: NSNotification){
// Take Action on Notification
}
对于历史上的Xcode版本…
发送(Post)通知
NSNotificationCenter.defaultCenter().postNotificationName("NotificationIdentifier", object: nil)
得到(获得)通知
NSNotificationCenter.defaultCenter().addObserver(self, selector: "methodOfReceivedNotification:", name:"NotificationIdentifier", object: nil)
删除通知
NSNotificationCenter.defaultCenter().removeObserver(self, name: "NotificationIdentifier", object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self) // Remove from all notifications being observed
接收的通知的方法处理程序
func methodOfReceivedNotification(notification: NSNotification) {
// Take Action on Notification
}
用@objc注释类或目标方法
@objc private func methodOfReceivedNotification(notification: NSNotification) {
// Take Action on Notification
}
// Or
dynamic private func methodOfReceivedNotification(notification: NSNotification) {
// Take Action on Notification
}
其他回答
在Swift 5中
我们说如果想从ViewControllerB接收数据到 ViewControllerA
ViewControllerA (Receiver)
import UIKit
class ViewControllerA: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//MARK: - - - - - Code for Passing Data through Notification Observer - - - - -
// add observer in controller(s) where you want to receive data
NotificationCenter.default.addObserver(self, selector: #selector(self.methodOfReceivedNotification(notification:)), name: Notification.Name("NotificationIdentifier"), object: nil)
}
//MARK: - - - - - Method for receiving Data through Post Notificaiton - - - - -
@objc func methodOfReceivedNotification(notification: Notification) {
print("Value of notification : ", notification.object ?? "")
}
}
视图控制器 B （发射器）
import UIKit
class ViewControllerB: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//MARK: - - - - - Set data for Passing Data Post Notification - - - - -
let objToBeSent = "Test Message from Notification"
NotificationCenter.default.post(name: Notification.Name("NotificationIdentifier"), object: objToBeSent)
}
}
Swift 4.0 & Xcode 9.0+:
发送(Post)通知:
NotificationCenter.default.post(name: Notification.Name("NotificationIdentifier"), object: nil)
OR
NotificationCenter.default.post(name: Notification.Name("NotificationIdentifier"), object: nil, userInfo: ["Renish":"Dadhaniya"])
得到(获得)通知:
NotificationCenter.default.addObserver(self, selector: #selector(self.methodOfReceivedNotification(notification:)), name: Notification.Name("NotificationIdentifier"), object: nil)
接收到的通知的函数方法处理程序:
@objc func methodOfReceivedNotification(notification: Notification) {}
Swift 3.0 & Xcode 8.0+:
发送(Post)通知:
NotificationCenter.default.post(name: Notification.Name("NotificationIdentifier"), object: nil)
得到(获得)通知:
NotificationCenter.default.addObserver(self, selector: #selector(YourClassName.methodOfReceivedNotification(notification:)), name: Notification.Name("NotificationIdentifier"), object: nil)
接收到的通知的方法处理程序:
func methodOfReceivedNotification(notification: Notification) {
// Take Action on Notification
}
删除通知:
deinit {
NotificationCenter.default.removeObserver(self, name: Notification.Name("NotificationIdentifier"), object: nil)
}
Swift 2.3和Xcode 7:
发送(Post)通知
NSNotificationCenter.defaultCenter().postNotificationName("NotificationIdentifier", object: nil)
得到(获得)通知
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(YourClassName.methodOfReceivedNotification(_:)), name:"NotificationIdentifier", object: nil)
接收的通知的方法处理程序
func methodOfReceivedNotification(notification: NSNotification){
// Take Action on Notification
}
对于历史上的Xcode版本…
发送(Post)通知
NSNotificationCenter.defaultCenter().postNotificationName("NotificationIdentifier", object: nil)
得到(获得)通知
NSNotificationCenter.defaultCenter().addObserver(self, selector: "methodOfReceivedNotification:", name:"NotificationIdentifier", object: nil)
删除通知
NSNotificationCenter.defaultCenter().removeObserver(self, name: "NotificationIdentifier", object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self) // Remove from all notifications being observed
接收的通知的方法处理程序
func methodOfReceivedNotification(notification: NSNotification) {
// Take Action on Notification
}
用@objc注释类或目标方法
@objc private func methodOfReceivedNotification(notification: NSNotification) {
// Take Action on Notification
}
// Or
dynamic private func methodOfReceivedNotification(notification: NSNotification) {
// Take Action on Notification
}
Swift 5和Xcode 10.2:
NotificationCenter.default.addObserver(
self,
selector: #selector(batteryLevelDidChangeNotification),
name: UIDevice.batteryLevelDidChangeNotification,
object: nil)
我们也应该删除通知。
Ex.
deinit
{
NotificationCenter.default.removeObserver(self, name:NSNotification.Name(rawValue: "notify"), object: nil)
}
创建一个objc函数，当通知被调用时执行该函数。
@objc func reloadNotification(_ notification: Notification) {
tblview.reloadData()
}
在didload视图中添加通知观察者。
NotificationCenter.default.addObserver(self, selector:#selector(reloadNotification(_:)), name: Notification.Name("reloadSideMenuDataNS"),object: nil)
将通知发布到想要调用函数的位置。
NotificationCenter.default.post(name: Notification.Name("reloadSideMenuDataNS"), object: nil)
您可以删除您的通知在视图已消失下面。
NotificationCenter.default.removeObserver(self, name: Notification.Name("reloadSideMenuDataNS"), object: nil)
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