WKWebView加载进度条

最新推荐文章于 2025-06-06 14:55:51 发布

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本文介绍了如何在iOS应用中使用WKWebView加载网页的同时，实现类似微信的加载进度条显示。通过创建WKWebView和进度条，初始化UI，注册和移除观察者，监听加载进度，并在viewDidLoad及dealloc中进行相应处理，可以达到这一效果。

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一、创建WKWebView和进度条

@property (nonatomic, strong) WKWebView         *webView;
@property (nonatomic, strong) UIProgressView    *progressView;

二、初始化UI

- (void)setupUI
{
    self.webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height - D_TabbarSafeBottomMargin)];
    [self.view addSubview:self.webView];

    self.progressView = [[UIProgressView alloc] initWithProgressViewStyle:(UIProgressViewStyleDefault)];
    self.progressView.frame = CGRectMake(0, 0, self.webView.frame.size.width, 2);
    self.progressView.trackTintColor = [UIColor clearColor];
    self.progressView.progressTintColor = [UIColor colorWithRed:75/255.0 green:181/255.0 blue:247/255.0 alpha:1.0];
    [self.progressView setProgress:0.1 animated:YES];
    [self.webView addSubview:self.progressView];
}

三、注册和移除观察者

- (void)_registerObserver
{
    [self.webView addObserver:self forKeyPath:@"estimatedProgress" options:(NSKeyValueObservingOptionNew) context:nil];
    [self.webView addObserver:self forKeyPath:@"title" options:(NSKeyValueObservingOptionNew) context:nil];
}

- (void)_removeObserver
{
    [self.webView removeObserver:self forKeyPath:@"estimatedProgress"];
    [self.webView removeObserver:self forKeyPath:@"title"];
}

四、加载链接这里我们以百度为例

- (void)loadRequest
{
    NSURL *url = [NSURL URLWithString:@"http:www.baidu.com"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [self.webView loadRequest:request];
}

五、实现观察方法

/**
 观察属性变化
 @param keyPath 被观察的属性
 @param object 被观察属性的对象
 @param change 被观察属性的值的包括旧值和新值
 @param context 上下文
 */
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context
{
    if ([object isEqual:self.webView] && [keyPath isEqualToString:@"estimatedProgress"]) {
        CGFloat newprogress = [[change objectForKey:NSKeyValueChangeNewKey] floatValue];
        if (newprogress >= 0.999) {
            [self.progressView setProgress:1.0 animated:YES];
            __weak typeof(self) weakSelf = self;
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            //防止weakSelf指针为nil造成闪退
                __strong typeof(weakSelf) strongSelf = weakSelf;
                strongSelf.progressView.hidden = YES;
                [strongSelf.progressView setProgress:0 animated:NO];
            });
        } else {
            self.progressView.hidden = NO;
            [self.progressView setProgress:newprogress animated:YES];
        }
    }else if ([object isEqual:self.webView] && [keyPath isEqualToString:@"title"]) {
         self.title = (NSString *)[change objectForKey:NSKeyValueChangeNewKey];
    }
}

六、加载viewDidLoad函数

- (void)viewDidLoad {
    self.isRefresh = NO;
    self.edgesForExtendedLayout = UIRectEdgeNone;
    [self setTitle:LocalizedBlueOfficeForKey(@"加载web")];
    [self setupUI];
    [self _registerObserver];
    [self loadRequest];
}

7、在dealloc中移除观察者

- (void)dealloc
{
    [self _removeObserver];
    [self _removeNotifacation];
}

总结：通过上述可以实现微信一样的加载web有进度条显示的效果，如果有其他要求可以在WKWebView的代理中进行处理