通過調研，我決定使用WKWebView替換原來的UIWebView。
遇到的第一個問題就是WKWebView無法在我喜愛的xib上設定，通過翻牆搜尋資料，原來WKWebView沒有實現initWithCoder方法，自然也就找到了解決辦法：

自定義一個MyWebView，繼承自WKWebView

.h

#import <WebKit/WebKit.h>
@interface MyWebView : WKWebView
@end

.m

#import "MyWebView.h"

@implementation MyWebView

- (instancetype)initWithCoder:(NSCoder *)coder
{
    CGRect
 
 frame = [[UIScreen mainScreen] bounds];
    WKWebViewConfiguration *configuration = [WKWebViewConfiguration new];
    configuration.userContentController = [WKUserContentController new];

    WKPreferences *preferences = [WKPreferences new];
    preferences.javaScriptCanOpenWindowsAutomatically = YES
 
;
    configuration.preferences = preferences;

    self = [super initWithFrame:frame configuration:configuration];
    self.translatesAutoresizingMaskIntoConstraints = NO;
    return self;
}

@end

這樣就可以像UIWebView一樣在xib設定約束了。

匯入MyWebView，投入使用

#import "WebViewController.h"
#import "MyWebView.h"
 


//1. 代理
@interface WebViewController ()<WKScriptMessageHandler, WKUIDelegate>

@property (strong, nonatomic) IBOutlet MyWebView *webView;

@end

@implementation WebViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UIBarButtonItem *button = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"返回"]  style:UIBarButtonItemStylePlain target:self action:@selector(goBack)];
    self.navigationItem.leftBarButtonItem = button;

    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:self.urlString]]];
    self.webView.UIDelegate = self;

    //JS呼叫OC:設定addScriptMessageHandler與name，並且設定<WKScriptMessageHandler>協議與協議方法
    [self.webView.configuration.userContentController addScriptMessageHandler:self name:@"callNativeKaihu"];//開戶
}

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    // 移除handlers，防止記憶體洩露
    [self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"callNativeKaihu"];
}

- (void)goBack{
    if ([self.webView canGoBack]) {
        [self.webView goBack];
    }else{
        [self.navigationController popViewControllerAnimated:YES];
    }
}

#pragma mark - WKScriptMessageHandler
//OC在JS呼叫方法做的處理
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    // 列印所傳過來的引數，只支援NSNumber, NSString, NSDate, NSArray, NSDictionary, NSNull型別
    NSLog(@"JS呼叫了 %@ 方法，返回引數 %@",message.name, message.body);
    if ([message.name isEqualToString:@"callNativeKaihu"]) {
        DRElectronicAccountVC *vc = [[DRElectronicAccountVC alloc]initWithNibName:@"DRElectronicAccountVC" bundle:nil];
        vc.dictionary = dic[@"data"];
        [self.navigationController pushViewController:vc animated:YES];
    }
}

WKWebView預設禁止了一些跳轉

• UIWebView
  開啟www.apple.com/itunes/跳轉到appStore, 撥打電話, 喚起郵箱等一系列操作UIWebView預設支援的。
• WKWebView
  預設禁止了以上行為，除此之外，js端通過alert()，彈窗的動作也被禁掉了。
  如何支援呢?

首先要設定WKWebView的WKUIDelegate，並實現以下方法

#pragma mark - WKUIDelegate
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    // js 裡面的alert實現，如果不實現，網頁的alert函式無效
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message message:nil preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
        completionHandler();
    }]];

    [self presentViewController:alertController animated:YES completion:^{}];
}

- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {
    // js 裡面的alert實現，如果不實現，網頁的alert函式無效
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message message:nil preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        completionHandler(YES);
    }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action){
        completionHandler(NO);
    }]];

    [self presentViewController:alertController animated:YES completion:^{}];
}

- (void)dealloc{
    NSLog(@"觀測web檢視釋放");
}