通過調(diào)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(shè)置禽翼，通過翻墻搜索資料溪北，原來WKWebView沒有實現(xiàn)initWithCoder方法劳翰，自然也就找到了解決辦法：

自定義一個MyWebView生均，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(shè)置約束了垫卤。

導(dǎo)入MyWebView评抚，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調(diào)用OC:設(shè)置addScriptMessageHandler與name，并且設(shè)置<WKScriptMessageHandler>協(xié)議與協(xié)議方法
    [self.webView.configuration.userContentController addScriptMessageHandler:self name:@"callNativeKaihu"];//開戶
}

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    // 移除handlers铛纬，防止內(nèi)存泄露
    [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調(diào)用方法做的處理
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    // 打印所傳過來的參數(shù)模她，只支持NSNumber, NSString, NSDate, NSArray, NSDictionary, NSNull類型
    NSLog(@"JS調(diào)用了 %@ 方法，返回參數(shù) %@",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默認(rèn)禁止了一些跳轉(zhuǎn)

• UIWebView
  打開www.apple.com/itunes/跳轉(zhuǎn)到appStore, 撥打電話, 喚起郵箱等一系列操作UIWebView默認(rèn)支持的。
• WKWebView
  默認(rèn)禁止了以上行為，除此之外痛垛，js端通過alert()蹂析，彈窗的動作也被禁掉了俺祠。
  如何支持呢?

首先要設(shè)置WKWebView的WKUIDelegate肺然，并實現(xiàn)以下方法

#pragma mark - WKUIDelegate
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    // js 里面的alert實現(xiàn)唇撬，如果不實現(xiàn)，網(wǎng)頁的alert函數(shù)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 里面的alert實現(xiàn)，如果不實現(xiàn)晚唇，網(wǎng)頁的alert函數(shù)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視圖釋放");
}