ios – WKWebView估计进度

这就是我所得到的：

self.view = self.webView;

NSURL *url = [NSURL URLWithString:stringWeb];
NSURLRequest *request = [NSURLRequest requestWithURL:url];

WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];

self.webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:configuration];

[self.webView loadRequest:request];

我看到这个答案有一点,但这是一个微调：UIWebView with Progress Bar

苹果公司记录了一些估计的进度(我假设它的导航栏下方的蓝色条,显示了Safari中的进度),但是我一般不会看到如何实现：https://developer.apple.com/library/ios/documentation/WebKit/Reference/WKWebView_Ref/#//apple_ref/occ/instp/WKWebView/estimatedProgress

所以我被困在这里任何帮助将不胜感激,谢谢！

更新：这是我现在所拥有的.因为看起来像我的进度视图和WKWebView正在加载两次,因为崩溃,我不知道为什么会这样.得到观察者需要删除的错误.这是我的代码,

ViewController.h

@interface WebPageViewController : UIViewController <UIWebViewDelegate>
@property (strong,nonatomic) NSString *stringMobile;
@property (strong,nonatomic) NSString *stringWeb;
@property (strong,nonatomic) IBOutlet UIView *view;
@property (nonatomic,strong) WKWebView *webView;
@property (nonatomic) UIProgressView *progressView;

ViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
    [self.view addSubview:self.webView];

    [self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:NULL];

    self.progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
    self.progressView.center = self.view.center;
    [self.view addSubview:self.progressView];

    NSURLRequest *URLRequest = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:stringWeb]];
    [self.webView loadRequest:URLRequest];


}

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

    // if you have set either WKWebView delegate also set these to nil here
    [self.webView setNavigationDelegate:nil];
    [self.webView setUIDelegate:nil];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if ([keyPath isEqualToString:@"estimatedProgress"] && object == self.webView) {
        [self.progressView setAlpha:1.0f];
        [self.progressView setProgress:self.webView.estimatedProgress animated:YES];

        if(self.webView.estimatedProgress >= 1.0f) {
            [UIView animateWithDuration:0.3 delay:0.3 options:UIViewAnimationOptionCurveEaSEOut animations:^{
                [self.progressView setAlpha:0.0f];
            } completion:^(BOOL finished) {
                [self.progressView setProgress:0.0f animated:NO];
            }];
        }
    }
    else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}

更新：使用CocoaPods这是我所拥有的,但它显示两个视图而不是一个webview

- (void)viewDidLoad {
    [super viewDidLoad];
    NSURL *myURL = [NSURL URLWithString: [self.url stringByAddingPercentEscapesUsingEncoding:
                                          NSUTF8StringEncoding]];
    NSURLRequest *request = [NSURLRequest requestWithURL:myURL];
    //[self.webView loadRequest:request];

    // KIN
    // Deleted UIWebView in Storyboard
    KINWebBrowserViewController *webBrowser = [[KINWebBrowserViewController alloc] init];
    [self.navigationController pushViewController:webBrowser animated:YES];
    [webBrowser loadURL:myURL];
}