iOS WKWebview OC与JS交互

作者: ___________枫林晚 | 来源:发表于2021-11-26 18:31 被阅读0次

WKWebView和UIWebView的区别

总结起来几点：

内存占用变小
支持更多的HTML5特性
高刷新
Safari相同的JavaScript引擎
加载速度变快

配置 $\color{#aa0000}{WKWebview}$

WKWebViewConfiguration

// 当前所属进程池
// WKProcessPool用来配置进程池，与网页视图的资源共享有关
@property (nonatomic, strong) WKProcessPool *processPool;

WKPreferences:偏好设置

// 偏好设置
@property (nonatomic, strong) WKPreferences *preferences;

WKPreferences-> propertys
//最小字体
@property (nonatomic) CGFloat minimumFontSize;
//是否可以打开没有用户交互的窗口
@property (nonatomic) BOOL javaScriptCanOpenWindowsAutomatically;
// 是否应警告可疑性的欺诈内容，（钓鱼网站或恶意软件）
@property (nonatomic, getter=isFraudulentWebsiteWarningEnabled) BOOL fraudulentWebsiteWarningEnabled API_AVAILABLE(macos(10.15), ios(13.0));

//是否开启文字互动
@property (nonatomic) BOOL textInteractionEnabled API_AVAILABLE(macos(11.3), ios(14.5));

WKUserContentController:OC与JS交互

@property (nonatomic, strong) WKUserContentController *userContentController;

WKWebsiteDataStore:网页使用到的数据管理类

@property (nonatomic, strong) WKWebsiteDataStore *websiteDataStore API_AVAILABLE(macos(10.11), ios(9.0));

指示网络视图是否在【内容渲染完全加载到内存之前】禁止内容呈现，默认是NO。
@property (nonatomic) BOOL suppressesIncrementalRendering;

在用户代理字符串中使用的应用程序的名称。
@property (nullable, nonatomic, copy) NSString *applicationNameForUserAgent API_AVAILABLE(macos(10.11), ios(9.0));

是否支持airplay
@property (nonatomic) BOOL allowsAirPlayForMediaPlayback API_AVAILABLE(macos(10.11), ios(9.0));

枚举类型，需要用户手势开始播放的媒体类型
@property (nonatomic) WKAudiovisualMediaTypes mediaTypesRequiringUserActionForPlayback API_AVAILABLE(macos(10.12), ios(10.0));

默认网页偏好设置
@property (null_resettable, nonatomic, copy) WKWebpagePreferences *defaultWebpagePreferences API_AVAILABLE(macos(10.15), ios(13.0));

限制app跳转
@property (nonatomic) BOOL limitsNavigationsToAppBoundDomains API_AVAILABLE(macos(11.0), ios(14.0));

指示HTML5视频是否内嵌播放，或使用native全屏控制器。
@property (nonatomic) BOOL allowsInlineMediaPlayback;

设置选择粒度 用户可以在网页视图中交互地选择内容的粒度级别。
@property (nonatomic) WKSelectionGranularity selectionGranularity;

HTML5视图是否可以播放画中画
@property (nonatomic) BOOL allowsPictureInPictureMediaPlayback API_AVAILABLE(ios(9_0));

识别数据类型 所需的数据监测类型。
@property (nonatomic) WKDataDetectorTypes dataDetectorTypes API_AVAILABLE(ios(10.0));

用于确定WKWebView是否应始终允许缩放网页。
@property (nonatomic) BOOL ignoresViewportScaleLimits API_AVAILABLE(ios(10.0));

#else
选择用户界面方向 用户界面元素的方向。
@property (nonatomic) WKUserInterfaceDirectionPolicy userInterfaceDirectionPolicy API_AVAILABLE(macos(10.12));

#endif

设置拦截的Scheme和对应回调
- (void)setURLSchemeHandler:(nullable id <WKURLSchemeHandler>)urlSchemeHandler forURLScheme:(NSString *)urlScheme API_AVAILABLE(macos(10.13), ios(11.0));

获取scheme对应回调
- (nullable id <WKURLSchemeHandler>)urlSchemeHandlerForURLScheme:(NSString *)urlScheme API_AVAILABLE(macos(10.13), ios(11.0));

OC与JS通讯

相互调用的基础是通讯协议（方法名、参数类型），通常都是JS端和OC端根据业务逻辑来共同制定

以下代码是对 $\color{#245dfe}{js}$ 和 $\color{#245dfe}{oc}$ 通讯的一个简单封装

#import <Foundation/Foundation.h>

@protocol WAExcuteScriptDelegate <NSObject>

- (void)excuteScript:(NSString *_Nonnull)script complition:(void (^ _Nullable)(_Nullable id, NSError * _Nullable error))complition;

@end

typedef void(^MessageHandle)(id _Nonnull body, NSString * _Nonnull name);

@class WKUserContentController;

NS_ASSUME_NONNULL_BEGIN

@interface WAScriptProcesser : NSObject

@property (nonatomic, weak) id<WAExcuteScriptDelegate> excuteDelegate;
@property (nonatomic, strong) WKUserContentController *userController;

// 脚本注入
- (void)addScript:(NSString *)script
             atStart:(BOOL)atStart
         isFrameMain:(BOOL)isFrameMain;

/** oc->js
 @param script 执行js中定义的函数 ：getName('name');
 @param complition 完成回调
 */
- (void)excuteScript:(NSString *)script complition:(void (^ _Nullable)(_Nullable id, NSError * _Nullable error))complition;
 
/** js->oc
 *  @param name ： 注册和  js 约定好的回调名称
 *  @param complition 回调
 */
- (void)registerHandleWithName:(NSString *)name complition:(MessageHandle)complition;
@end

NS_ASSUME_NONNULL_END

//
//  WAScriptProcesser.m
//  JSView
//
//  Created by admin on 2021/11/12.
//

#import "WAScriptProcesser.h"
#import <WebKit/WebKit.h>


@interface WAScriptProcesser ()<WKScriptMessageHandlerWithReply,WKScriptMessageHandler>

@property (nonatomic, strong) NSMutableDictionary *handleDict;

@end



@implementation WAScriptProcesser

- (NSMutableDictionary *)handleDict
{
    if (_handleDict == nil)
    {
        _handleDict = [[NSMutableDictionary alloc] init];
    }
    return _handleDict;
}

- (WKUserContentController *)contentController
{
    if (_userController == nil)
    {
        _userController = [[WKUserContentController alloc] init];
    }
    return _userController;
}

- (void)addScript:(NSString *)script
             atStart:(BOOL)atStart
         isFrameMain:(BOOL)isFrameMain
{
    WKUserScript *userScript = [[WKUserScript alloc] initWithSource:script injectionTime:atStart?WKUserScriptInjectionTimeAtDocumentStart:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:isFrameMain];
    [self.userController addUserScript:userScript];
}

- (void)excuteScript:(NSString *)script complition:(void (^ _Nullable)(_Nullable id, NSError * _Nullable error))complition
{
    [self.excuteDelegate excuteScript:script complition:complition];
}

- (void)registerHandleWithName:(NSString *)name complition:(MessageHandle)complition
{
    [self.userController addScriptMessageHandler:self name:name];
    [self.handleDict setValue:[complition copy] forKey:name];
}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message replyHandler:(void (^)(id _Nullable reply, NSString *_Nullable errorMessage))replyHandler WK_SWIFT_ASYNC(3) API_AVAILABLE(macos(11.0), ios(14.0))
{
    
}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    NSString *name = message.name;
    id body = message.body;
    MessageHandle block  = (MessageHandle)[self.handleDict objectForKey:name];
    if (block)
    {
        block(body, name);
    }
}


@end

Scheme拦截

#import <Foundation/Foundation.h>
#import <WebKit/WebKit.h>

typedef void(^RouterHandler)(BOOL isStart, id <WKURLSchemeTask> _Nonnull urlSchemeTask, NSDictionary * _Nonnull params);

NS_ASSUME_NONNULL_BEGIN

@interface WARouter : NSObject

- (void)registerPattern:(NSString *)pattern handle:(RouterHandler)handle;

@end

NS_ASSUME_NONNULL_END

#import "WARouter.h"


@interface WARouter ()<WKURLSchemeHandler>

@property (nonatomic, strong) NSMutableDictionary *routers;

@end

@implementation WARouter

- (NSMutableDictionary *)routers
{
    if (_routers == nil)
    {
        _routers = [[NSMutableDictionary alloc] init];
    }
    return _routers;
}


- (void)registerPattern:(NSString *)pattern handle:(RouterHandler)handle
{
    [self.routers setValue:[handle copy] forKey:pattern];
}

- (void)webView:(WKWebView *)webView startURLSchemeTask:(id <WKURLSchemeTask>)urlSchemeTask
{
    NSURL *url = urlSchemeTask.request.URL;
    
    NSString *scheme = url.scheme;
    
    NSArray *pairs = [url.query componentsSeparatedByString:@"&"];
    
    NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
    for (NSString *str in pairs)
    {
        NSArray *pair = [str componentsSeparatedByString:@"="];
        [params setValue:[pair lastObject] forKey:[pair firstObject]];
    }
    
    [params addEntriesFromDictionary:urlSchemeTask.request.allHTTPHeaderFields];
    
    RouterHandler handler = [self.routers objectForKey:scheme];
    
    handler(YES, urlSchemeTask, params);
    
}

- (void)webView:(WKWebView *)webView stopURLSchemeTask:(id <WKURLSchemeTask>)urlSchemeTask
{
    NSURL *url = urlSchemeTask.request.URL;
    
    NSString *scheme = url.scheme;
    
    NSArray *pairs = [url.query componentsSeparatedByString:@"&"];
    
    NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
    for (NSString *str in pairs)
    {
        NSArray *pair = [str componentsSeparatedByString:@"="];
        [params setValue:[pair lastObject] forKey:[pair firstObject]];
    }
    
    [params addEntriesFromDictionary:urlSchemeTask.request.allHTTPHeaderFields];
    
    RouterHandler handler = [self.routers objectForKey:scheme];
    
    handler(NO, urlSchemeTask, params);
}


@end

Demo 工程

WKWebview的优化和坑，参考如下
https://juejin.cn/post/6861778055178747911
https://segmentfault.com/a/1190000039111381
https://cloud.tencent.com/developer/article/1005691

WKWebview API全解
https://cloud.tencent.com/developer/article/1485172

iOS WKWebview OC与JS交互

WKWebView和UIWebView的区别

配置 $\color{#aa0000}{WKWebview}$

OC与JS通讯

Scheme拦截

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