WKWebView添加进度条，标题，逐级返回

//

//  IntegralMallViewController.m

//  M

//

//  Created by zsl on 2018/4/19.

//  Copyright © 2018年 zsl. All rights reserved.

//

#import "IntegralMallViewController.h"

#import

@interfaceIntegralMallViewController ()

/**新版WebView*/

@property(nonatomic,weak) WKWebView *webView;

/**进度条*/

@property(nonatomic,weak) UIProgressView *progressView;

/**返回按钮*/

@property(nonatomic,strong) UIBarButtonItem *backItem;

/**关闭按钮*/

@property(nonatomic,strong) UIBarButtonItem *closeItem;

@end

@interfaceNSURLRequest (InvalidSSLCertificate)//https证书

+ (BOOL)allowsAnyHTTPSCertificateForHost:(NSString *)host;

+ (void)setAllowsAnyHTTPSCertificate:(BOOL)allow forHost:(NSString *)host;

@end

@implementationIntegralMallViewController

#pragma mark - 添加关闭按钮

- (void)addLeftButton {

    self.navigationItem.leftBarButtonItem =self.backItem;

}

#pragma mark - init

/**

 * 返回按钮

 */

- (UIBarButtonItem *)backItem {

    if(!_backItem) {

        _backItem = [[UIBarButtonItem alloc]initWithImage:[UIImage imageWithOriginalName:@"root_cancel"]style:UIBarButtonItemStylePlain target:selfaction:@selector(backNative)];

        self.navigationItem.leftBarButtonItem = _backItem;

    }

    return_backItem;

}

/**

 * 点击返回的方法

 */

- (void)backNative {

    //判断是否有上一层H5页面

    if([self.webViewcanGoBack]) {

        //如果有则返回

        [self.webViewgoBack];

        //同时设置返回按钮和关闭按钮为导航栏左边的按钮

        self.navigationItem.leftBarButtonItems = @[self.backItem, self.closeItem];

    }else{

        [selfcloseNative];

    }

}

/**

 * 关闭按钮

 */

- (UIBarButtonItem*)closeItem {

    if (!_closeItem) {

        _closeItem = [[UIBarButtonItem alloc] initWithTitle:@"关闭" style:UIBarButtonItemStylePlain target:self action:@selector(closeNative)];

    }

    return _closeItem;

}

/**

 * 关闭H5页面，直接回到原生页面

 */

- (void)closeNative {

    [self.navigationController popViewControllerAnimated:YES];

}

- (void)viewDidLoad {

    [super viewDidLoad];

    /**1、添加返回按钮*/

    [self addLeftButton];

    /**2、初始化webView*/

    [self setupWebView];

    /**3、初始化进度条*/

    [self setupProgressView];

}

#pragma mark - 初始化

- (void)setupWebView {

    // 创建WKWebView

    WKWebView *webView = [[WKWebView alloc] initWithFrame:[UIScreen mainScreen].bounds];

    _webView= webView;

    self.webView.navigationDelegate = self;

    self.webView.allowsBackForwardNavigationGestures = YES;

    // 设置访问的URL

    NSURL *url = [NSURL URLWithString:@"https://www.jianshu.com/writer#/notebooks/22697260/notes/26857069"];

    // 根据URL创建请求

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    [NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[url host]];

    // WKWebView加载请求

    [_webView loadRequest:request];

    // 将WKWebView添加到视图

    [self.viewaddSubview:_webView];   

    [self.webView addObserver:self forKeyPath:@"estimatedProgress" options:0 context:nil];

    /**添加title观察者*/

    [self.webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:nil];

}

/**

 * 初始化进度条

 */

- (void)setupProgressView {

    UIProgressView *progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];

    _progressView= progressView;

    self.progressView.frame=CGRectMake(0,1,kScreenWidth,5);

    [self.progressView setTrackTintColor:[UIColor colorWithRed:240.0/255

                                                    green:240.0/255

                                                     blue:240.0/255

                                                    alpha:1.0]];

    self.progressView.progressTintColor=  ZTCOLOR;

    [self.view addSubview:self.progressView];

}

#pragma mark - WKNavigationDelegate

- (void)webView:(WKWebView*)webView didStartProvisionalNavigation:(WKNavigation*)navigation {

        //开始加载的时候，让进度条显示

    self.progressView.hidden = NO;

}

- (void)webView:(WKWebView*)webView didCommitNavigation:(WKNavigation*)navigation {

}

- (void)webView:(WKWebView*)webView didFinishNavigation:(WKNavigation*)navigation {

}

#pragma mark - KVO

//kvo 监听进度

-(void)observeValueForKeyPath:(NSString*)keyPath ofObject:(id)object  change:(NSDictionary *)change context:(void*)context {

    if([keyPathisEqualToString:@"estimatedProgress"] ) {

        [self.progressViewsetAlpha:1.0f];

        BOOLanimated =self.webView.estimatedProgress>self.progressView.progress;

        [self.progressViewsetProgress:self.webView.estimatedProgressanimated:animated];

        if(self.webView.estimatedProgress>=1.0f) {

            [UIView animateWithDuration:0.3f delay:0.3f options:UIViewAnimationOptionCurveEaseOut animations:^{

                    [self.progressViewsetAlpha:0.0f];

            }completion:^(BOOLfinished) {

                    [self.progressViewsetProgress:0.0fanimated:NO];

            }];

        }

    }  elseif([keyPathisEqualToString:@"title"]) {//网页title

            if(object ==self.webView) {

                self.title=self.webView.title;

            }  else{

                [superobserveValueForKeyPath:keyPathofObject:objectchange:changecontext:context];

            }

    }else{

        [superobserveValueForKeyPath:keyPathofObject:objectchange:changecontext:context];

    }

}

- (void)dealloc {

    [self.webView removeObserver:self forKeyPath:@"title"];

    [self.webView removeObserver:self forKeyPath:@"estimatedProgress"];

    self.webView.navigationDelegate = nil;    

    [self.webView setUIDelegate:nil];

}

@end