Question

我最近在Xcode中将UIWebView更改为WKWebView，到目前为止一切正常。但是，当我在IBs属性检查器中使用“链接预览”（对我来说非常有用的功能）复选标记字段时，该应用程序在后台时会完全变黑。这意味着用户要再次使用它时必须杀死它。

这是WebViewController的代码：

@interface WebViewController ()

@end

@implementation WebViewController
@synthesize activityIndicatorView = _activityIndicatorView;


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        NSLog(@"Webview");
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    _webView.UIDelegate = self;
    _webView.navigationDelegate = self;


    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:self.webLink]]];


    [self setupConstraints];

}


-(void)setupConstraints {
    [self.webView setTranslatesAutoresizingMaskIntoConstraints:NO];

    [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.webView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.view.safeAreaLayoutGuide attribute:NSLayoutAttributeTop multiplier:1.0 constant:0.0]];
    [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.webView attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeading multiplier:1.0 constant:0.0]];
    [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.webView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeWidth multiplier:1.0 constant:0.0]];
    [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.webView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:self.view.safeAreaLayoutGuide attribute:NSLayoutAttributeHeight multiplier:1.0 constant:0.0]];
}


@end

这就是我从tableView调用WKWebViewController的方式：

 WebViewController *webVC = [[WebViewController alloc] initWithNibName:@"WebViewController" bundle:nil];

                        webVC.webLink = str;

                        [self.navigationController pushViewController:webVC animated:YES];

在什么情况下如何防止控制器变黑 “链接预览”已打开，并且应用程序在后台运行后又回来了？

（Xcode 11.4.1，目标iOS 11）

非常感谢！马丁

当应用程序处于后台时，WKWebView会显示黑屏

0 个答案: