[英]send notification from swift file and recieve in objective c file in ios
我正在尝试将通知从swift文件发送到目标c。 到目前为止我的尝试:
ClassA.swift
override func viewDidLoad() {
super.viewDidLoad()
let containerDict:[String:AnyObject] = ["vwConatinerFrameWidth": vwContainer.frame.size.width, "vwConatinerFrameHeight": vwContainer.frame.size.height]
NSNotificationCenter.defaultCenter().postNotificationName("ContainerFrame", object: self, userInfo: containerDict)
let classB = ClassB(nibName: "ClassB", bundle: nil)
classB.willMoveToParentViewController(self)
self.vwContainer.addSubview(classB.view)
self.addChildViewController(classB)
classB.didMoveToParentViewController(self)
}
ClassB.m
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(containeFrameRecieved:)
name:@"ContainerFrame"
object:nil];
}
- (void)containeFrameRecieved:(NSNotification *)note {
NSDictionary *theData = [note userInfo];
if (theData != nil) {
CGFloat containerFrameWidth = [[theData objectForKey:@"vwConatinerFrameWidth"] floatValue];
CGFloat containerFrameHeight = [[theData objectForKey:@"vwConatinerFrameHeight"] floatValue];
NSLog(@"Width:%f and Height: %f",containerFrameWidth,containerFrameHeight);
}
}
我的桥接,Header.h
#import "ClassB.h"
但是问题是,该价值并没有体现在ClassB上。 谁能告诉我这段代码有什么问题吗?
发布通知后,您将创建ClassB
的对象。 因此,在发布通知时, ClassB
对象不存在。 发布通知之前,请确保已调用ClassB的viewDidLoad:
只有这样, ClassB
才能收听通知并获取值
更新了Swift 4.1的答案
// Notification name for swift
extension NSNotification.Name {
static let NotificationName = Notification.Name(rawValue: "NotificationName")
}
// Notification name for Objective-C
@objc public extension NSNotification {
public static var NotificationName: String {
return "NotificationName"
}
}
在swift文件中发布通知
NotificationCenter.default.post(name: NSNotification.Name.NotificationName, object: nil)
在Objective-C文件中观察
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(selectorName:) name:NSNotification.NotificationName object:nil];
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