[iOS]WKWebView的使用

demo:https://download.csdn.net/download/u012881779/10928927
使用WKWebView加载H5，并与之进行一些交互。
[GABaseWKWebView]

#import "GABaseWKWebView.h"

@implementation GABaseWKWebView

- (instancetype)init {
    self = [super init];
    if (self) {
        [self setUserAgentInfo];
    }
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self setUserAgentInfo];
    }
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame configuration:(nonnull WKWebViewConfiguration *)configuration {
    self = [super initWithFrame:frame configuration:configuration];
    if (self) {
        [self setUserAgentInfo];
    }
    return self;
}

- (void)setUserAgentInfo {
    // userAgent设置
    [self evaluateJavaScript:@"navigator.userAgent" completionHandler:^(id result, NSError *error) {
        NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
        NSString *appVer = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
        NSString *oldAgent = result;
        NSString *newAgent;
        // 给User-Agent添加额外的信息 - 区分来自哪个app
        if ([oldAgent containsString:@"appmark"]) {
            newAgent = oldAgent;
        } else {
            newAgent = [NSString stringWithFormat:@"%@;AppInfo:appName=%@&&appVer=%@", oldAgent, @"appmark", appVer];
        }
        // 设置global User-Agent
        if (@available(iOS 9.0, *)) {
            [self setCustomUserAgent:newAgent];
        }
    }];
}

@end

[GABaseWKWebViewController]

#import "GABaseWKWebViewController.h"
#import <WebKit/WebKit.h>
#import "GABaseWKWebView.h"

@interface GABaseWKWebViewController () <WKNavigationDelegate, WKScriptMessageHandler>

@property (strong, nonatomic) GABaseWKWebView *webView;
@property (strong, nonatomic) NSArray *nameMArr;
@property (nonatomic, strong) NSString *loadUrl;

@end

@implementation GABaseWKWebViewController

- (void)dealloc {
    _loadUrl = nil;
    _webView = nil;
    _nameMArr = nil;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    if (!_webView) {
        _webView = [[GABaseWKWebView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
        _webView.navigationDelegate = self;
    }
    [self.view addSubview:_webView];
    
    /*
     链接不支持https协议时，需要去Info.plist设置允许任意加载
     App Transport Security Settings
        Allow Arbitrary Loads           YES
     */
    NSURL *pathUrl = [self handleLoadUrl:_loadUrl];
    [_webView loadRequest:[NSURLRequest requestWithURL:pathUrl]];
}

- (NSURL *)handleLoadUrl:(NSString *)urlString {
    // 处理url带有中文的
    NSString *encodedString = (NSString*) CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)urlString,(CFStringRef)@"!$&'()*+,-./:;[email protected]_~%#[]",NULL, kCFStringEncodingUTF8));
    NSURL *url = [NSURL URLWithString:encodedString];
    return url;
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self addScriptAction];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self removeScriptAction];
}

// 注入JavaScript与原生交互协议
// JS 端可通过 window.webkit.messageHandlers.<name>.postMessage(<messageBody>) 发送消息
- (void)addScriptAction {
    if (!_nameMArr) {
        _nameMArr = [[NSArray alloc] initWithObjects:@"goHomeIos",@"sharePagesIos",@"getUserInfoIos",nil];
    }
    for (NSString *subName in _nameMArr) {
        [_webView.configuration.userContentController addScriptMessageHandler:self name:subName];
    }
}

// 移除注入的协议
- (void)removeScriptAction {
    if (_nameMArr) {
        for (NSString *subName in _nameMArr) {
            [_webView.configuration.userContentController removeScriptMessageHandlerForName:subName];
        }
    }
}

#pragma mark - WKNavigationDelegate

- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation {
    NSLog(@"开始加载");
}

- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation {
    NSLog(@"内容开始返回");
}

- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {
    NSLog(@"加载完成");
}

- (void)webView:(WKWebView *)webView didFailLoadWithError:(nonnull NSError *)error {
    NSLog(@"加载失败 error : %@",error.description);
}

// 在发送请求之前，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    if (navigationAction.targetFrame == nil) {
        [webView loadRequest:navigationAction.request];
    }
    NSURL *URL = navigationAction.request.URL;
    NSString *urlPath = [URL absoluteString];
    NSString *scheme = [URL scheme];
    NSString *resourceSpecifier = [URL resourceSpecifier];
    
    if ([scheme isEqualToString:@"tel"]) {
        NSString *callPhone = [NSString stringWithFormat:@"telprompt://%@", resourceSpecifier];
        // 防止iOS 10及其之后，拨打电话系统弹出框延迟出现
        dispatch_async(dispatch_get_global_queue(0, 0), ^{
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callPhone]];
        });
        decisionHandler(WKNavigationActionPolicyCancel);
    } else if ([scheme isEqualToString:@"mqq"]) {
        if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"mqq://"]]) {
            NSString *callQQ = [NSString stringWithFormat:@"mqq://%@", resourceSpecifier];
            dispatch_async(dispatch_get_global_queue(0, 0), ^{
                [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callQQ]];
            });
        }
        decisionHandler(WKNavigationActionPolicyCancel);
    } else if ([scheme isEqualToString:@"mailto"]) {
        NSString *callEmail = [NSString stringWithFormat:@"mailto://%@", resourceSpecifier];
        dispatch_async(dispatch_get_global_queue(0, 0), ^{
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callEmail]];
        });
        decisionHandler(WKNavigationActionPolicyCancel);
    } else {
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}

// 在收到响应后，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    decisionHandler(WKNavigationResponsePolicyAllow);
}

#pragma mark - 执行JavaScript代码

- (void)loadJs:(NSString *)js {
    // ios11要求evaluateJavaScript主线程
    dispatch_async(dispatch_get_main_queue(), ^{
        [self.webView evaluateJavaScript:js completionHandler:^(id _Nullable response, NSError * _Nullable error) {
            if (error) {
                NSLog(@"evaluateJavaScript error = %@\n", error);
            }
        }];
    });
}

#pragma mark - WKScriptMessageHandler
/*
 在协议方法中获取JavaScript端传递的事件和参数
 WKScriptMessage
    name    协议名称
    body    传递的参数
 */
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    NSLog(@"body:%@", message.body);
    NSLog(@"message.name = %@",message.name);
    NSString *name = message.name;
    if ([name isEqualToString:@"goHomeIos"]) {
        // 首页
    } else if ([name isEqualToString:@"sharePagesIos"]) {
        // 分享
    } else if ([message.name isEqualToString:@"getUserInfoIos"]) {
        // 获取用户信息
        [self getUsrInfo];
    }
}

- (void)getUsrInfo {
    NSString *usrId = @"UserID";
    NSString *token = @"Token";
    NSString *identity = @"Identity";
    NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:token,@"token", identity,@"identity", usrId,@"userId", nil];
    NSString *jsBody = [self dictionaryToJson:dic];
    NSString *js = [NSString stringWithFormat:@"javascript:vueObj.getUserInfoPage('%@')", jsBody];
    [self loadJs:js];
}

- (NSString *)dictionaryToJson:(NSDictionary *)dic {
    if (dic == nil) {
        return @"";
    }
    NSError *parseError = nil;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&parseError];
    NSString *jsonStr = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
    jsonStr = [jsonStr stringByReplacingOccurrencesOfString:@"\n" withString:@""];
    jsonStr = [jsonStr stringByReplacingOccurrencesOfString:@" " withString:@""];
    jsonStr = [jsonStr stringByReplacingOccurrencesOfString:@"\\/" withString:@"/"];
    return jsonStr;
}

@end

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[iOS]WKWebView的使用--API篇
iOS11.3 WKWebView清除cookie所踩的坑！