要实现Angular/HTML5与iOS WKWebView之间的通信，可以使用JavaScript与Objective-C之间的交互方式。以下是一个解决方案的示例代码：

在HTML页面中：

// 发送消息给iOS
function sendMessageToiOS(message) {
    window.webkit.messageHandlers.iOSNative.postMessage(message);
}

// 接收来自iOS的消息
function receiveMessageFromiOS(message) {
    console.log('Received message from iOS:', message);
}

在Angular组件中：

import { Component } from '@angular/core';

// 发送消息给iOS
function sendMessageToiOS(message) {
    window.webkit.messageHandlers.iOSNative.postMessage(message);
}

// 接收来自iOS的消息
function receiveMessageFromiOS(message) {
    console.log('Received message from iOS:', message);
}

@Component({
  selector: 'app-root',
  template: `
    Send Message to iOS
  `
})
export class AppComponent {
  sendMessageToiOS(message) {
    sendMessageToiOS(message);
  }

  receiveMessageFromiOS(message) {
    receiveMessageFromiOS(message);
  }
}

在iOS中：

#import 

@interface ViewController : UIViewController

@property (nonatomic, strong) WKWebView *webView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
    [config.userContentController addScriptMessageHandler:self name:@"iOSNative"];

    self.webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:config];
    self.webView.UIDelegate = self;
    self.webView.navigationDelegate = self;
    [self.view addSubview:self.webView];

    NSString *htmlPath = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"];
    NSURL *htmlURL = [NSURL fileURLWithPath:htmlPath];
    [self.webView loadRequest:[NSURLRequest requestWithURL:htmlURL]];
}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    if ([message.name isEqualToString:@"iOSNative"]) {
        NSLog(@"Received message from HTML: %@", message.body);
        // 执行iOS相关操作
    }
}

@end

这样，你就可以在Angular/HTML页面中调用sendMessageToiOS函数发送消息给iOS，并在iOS的didReceiveScriptMessage方法中接收并处理消息。