ShengQianProject/YouHuiProject/YouHui/GoodDetailVi.../ViewController/DRWebDetailC...

//
//  DRWebDetailController.m
//  YouHuiProject
//
//  Created by 小花 on 2018/5/29.
//  Copyright © 2018年 kuxuan. All rights reserved.
//

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

@interface DRWebDetailController ()<WKUIDelegate, WKNavigationDelegate>

@property (nonatomic, strong) WKWebView *webView;

/** 加载进度条 */
@property (nonatomic, strong) UIProgressView *progressView;

@property (nonatomic, strong) UIButton *backButton;
@property (nonatomic, strong) UIButton *closeButton;
@end

@implementation DRWebDetailController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self configNavigationBar];
    [self loadRequest];
}

- (void)configNavigationBar {
    
    self.view.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:self.webView];
    [self.view addSubview:self.progressView];
    
    self.navigationBar.showNavigationBarBottomLine = YES;
    [self.navigationBar setNavTitle:@"商品详情"];
    [self.navigationBar setCustomLeftButtons:@[self.backButton]];
    self.navigationBar.backgroundColor = [UIColor clearColor];
    
    if (@available(iOS 11.0, *)) {
        self.webView.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;//UIScrollView也适用
    }else {
        self.automaticallyAdjustsScrollViewInsets = NO;
    }
}

- (void)loadRequest {
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:self.url]];
    [self.webView loadRequest:request];
}


/**
 kvo监听进度条
 
 @param keyPath keyPath description
 @param object object description
 @param change change description
 @param context context description
 */
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{
    if ([keyPath isEqualToString:NSStringFromSelector(@selector(estimatedProgress))] && object == self.webView ) {
        [self.progressView setAlpha:1.0];
        
        [self.progressView setProgress:self.webView.estimatedProgress ];
        if (self.webView.estimatedProgress >= 1.0) {
            [UIView animateWithDuration:0.7 animations:^{
                [self.progressView setProgress:1.0 animated:YES];
                [self.progressView setAlpha:0.0];
                
            }];
            
        }
    }else{
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}


#pragma mark-
#pragma mark- WKNavigationDelegate delegate


/**
 开始加载web的时候
 
 @param webView webView description
 @param navigation navigation description
 */
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation{
    //开始加载的时候,让进度条显示
    self.progressView.hidden = NO;
    self.progressView.progress = 0;
    self.progressView.alpha = 1.0;
    [UIView animateWithDuration:0.8 animations:^{
        self.progressView.progress = 0.6;
        
    }];
}

/**
 当网页加载完成的时候调用
 
 @param webView web描述
 @param navigation 导航的描述
 */
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
    self.title = self.webView.title;
    [[UIApplication sharedApplication]setNetworkActivityIndicatorVisible:NO];
    [self updateNavigationBarButtons];
}



#pragma mark -----------
- (void)updateNavigationBarButtons {
    if (self.webView.canGoBack) {
        [self.navigationBar setCustomLeftButtons:@[self.backButton,self.closeButton]];
    }else {
        [self.navigationBar setCustomLeftButtons:@[self.backButton]];
    }
}


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

- (void)closeAction {
    [self.navigationController popViewControllerAnimated:YES];
}


- (WKWebView *)webView{
    if (!_webView) {
        
        _webView = [[WKWebView alloc]initWithFrame:CGRectMake(0, NavBarHeight, SCREEN_WIDTH, SCREEN_HEIGHT-NavBarHeight)];
        _webView.backgroundColor = [UIColor colorWithRed:240.0/255 green:240.0/255 blue:240.0/255 alpha:1.0];
        _webView.navigationDelegate = self;
        _webView.UIDelegate = self;
        //使用kvo监听进度
        [_webView addObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress)) options:0 context:nil];
        //手势触摸滑动
        _webView.allowsBackForwardNavigationGestures = YES;
        //自适应
        [_webView sizeToFit];
        //自适应
        [_webView sizeToFit];
    }
    return _webView;
}

#pragma mark-
#pragma mark- SetupConstraints

/** 加载配置以及视图添加*/
- (void)loadSubViewsConfiguration{
    
    [self.view addSubview:self.webView];
}


- (UIButton *)backButton {
    if (!_backButton) {
        _backButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
        [_backButton setImage:[UIImage imageNamed:@"back"] forState:UIControlStateNormal];
        [_backButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];
    }
    return _backButton;
}

- (UIButton *)closeButton {
    if (!_closeButton) {
        _closeButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
        [_closeButton setImage:[UIImage imageNamed:@"close_web"] forState:UIControlStateNormal];
        [_closeButton addTarget:self action:@selector(closeAction) forControlEvents:UIControlEventTouchUpInside];
    }
    return _closeButton;
}


- (UIProgressView *)progressView{
    if (!_progressView) {
        _progressView = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleDefault];
        _progressView.frame = CGRectMake(0, NavBarHeight, self.view.frame.size.width, 2);
        //设置进度条的色彩
        [_progressView setTrackTintColor:[UIColor colorWithRed:240.0/255 green:240.0/255 blue:240.0/255 alpha:1.0]];
        _progressView.progressTintColor = [UIColor homeRedColor];
    }
    return _progressView;
}

//观察的移除
- (void)dealloc{
    [self.webView removeObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress))];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end