ios - WKWebView 重新加载，然后为本地 index.html 文件变为空白

Question

我有这个文件，我正在尝试重新加载，但是当我重新加载它时，我得到了应该显示的屏幕，然后是一个空白屏幕，直到我再次点击重新加载。我不确定为什么会出现这个空白屏幕。另外，我没有得到任何东西

- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView {}

也不

-(void)didReceiveMemoryWarning

这是我的 viewController.m 文件我有 index.html 文件在与它加载一次相同的目录中，但我不确定 webkit 是否崩溃或在哪里

#import "ViewController.h"
#import <WebKit/WebKit.h>
#import <JavaScriptCore/JavaScriptCore.h>

@interface ViewController ()

@end

@implementation ViewController


NSString *localURL;
NSURLRequest *urlRequest;

- (void)viewDidLoad {

  [super viewDidLoad];

  JSContext *ctx = [[JSContext alloc] init];
  ctx[@"console"][@"log"] = ^(NSString *message) {
    NSLog(@"Javascript log: %@", message);
};

// Do any additional setup after loading the view, typically from a nib.
// [UIView setAnimationsEnabled:NO];
//_webView = [[WKWebView alloc] initWithFrame:self.view.frame];
// _webView.navigationDelegate = self.webView ;
// _webView.UIDelegate = self;
//[self.view addSubview:_webView ];

_webView= [[WKWebView alloc] initWithFrame:CGRectMake(0, 100, 500, 500)];
 localURL = [[NSBundle mainBundle] pathForResource:@"index"  ofType:@"html"];
urlRequest = [NSURLRequest requestWithURL:[NSURL   fileURLWithPath:localURL]];
[_webView loadRequest:urlRequest];
[self.view addSubview:_webView];

//button
  UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
  [button addTarget:self action:@selector(reload)  forControlEvents:UIControlEventTouchUpInside];
  [button setTitle:@"Reload" forState:UIControlStateNormal];
  button.frame = CGRectMake(10.0, 20.0, 100.0, 50.0);
  button.backgroundColor = UIColor.blackColor;
  [self.view addSubview:button];

}
 - (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView {
 // Reload current page, since we have crashed the WebContent process
 // (most likely due to memory pressure)

 NSLog(@"most likely due to memory pressure reloaded");
 [webView reload];
}
-(void)reload{
  NSLog(@"reloading now");
  [self.webView loadRequest:urlRequest];

  //[self.webView stopLoading];
 // [self loadView];
  //[_webView loadRequest:urlRequest];

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


//- (IBAction)rButton:(UIButton *)sender {
// NSLog(@"Well we didnt crash");
//  [self.webView reload];
//}
@end

Answer 1

如果问题是由于网络终止，则将调用委托(delegate)函数 webViewWebContentProcessDidTerminate。

在您的情况下，您似乎没有将 viewController 设置为 webview 的 navigationDelegate:

webview.navigationDelegate = self