回答編集履歴
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実装例を提示
answer
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同じ現象ではありませんが関連するteratailの質問とStackoverflowを貼っておきます。こちらは、表示が真っ白になったり遷移しなかったりという内容です。
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- [iOS - swift WKWebViewで表示したブラウザのpdfファイルを開きたい｜teratail](https://teratail.com/questions/209048)
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- [iOS 13 WKWebView not showing pdf file anymore](https://stackoverflow.com/questions/58073513/ios-13-wkwebview-not-showing-pdf-file-anymore)
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- [iOS 13 WKWebView not showing pdf file anymore](https://stackoverflow.com/questions/58073513/ios-13-wkwebview-not-showing-pdf-file-anymore)
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----
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Mar 11, 2020 追記
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仕様固めに時間がかかってしまいました。
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「いったんWebコンテンツを開くが、PDFのダウンロードリンクを開く場合がある」というシチュエーションで、当方では下記のように実装しました。ご参考になれば幸いです。
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```objectivec
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// MyWebViewController.h
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#import <UIKit/UIKit.h>
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#import <WebKit/WebKit.h>
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#import <QuickLook/QuickLook.h>
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NS_ASSUME_NONNULL_BEGIN
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@interface MyWebViewController : UIViewController <WKNavigationDelegate, WKUIDelegate, QLPreviewControllerDataSource>
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@property (nonatomic) NSString *firstUrl;
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@end
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NS_ASSUME_NONNULL_END
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```
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```objectivec
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// MyWebViewController.m
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@interface MyWebViewController()
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@property (nonatomic) WKWebView *webView;
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@property (nonatomic) NSString *previewFilePath;
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@end
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- (void)viewDidLoad {
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[super viewDidLoad];
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self.webView = [[WKWebView alloc] init];
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self.webView.navigationDelegate = self;
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self.webView.UIDelegate = self;
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self.webView.translatesAutoresizingMaskIntoConstraints = false;
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[self.view addSubview:self.webView];
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// 制約の設定等は省略...
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}
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- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
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NSURL *url = navigationAction.request.URL;
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if([url.absoluteString compare:self.firstUrl] == NSOrderdSame) {
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decisionHandler(WKNavigationActionPolicyAllow);
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return;
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}
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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[[NSURLSession.sharedSession dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
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if(error != nil || data == nil || data.length == 0) {
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NSString *errorDescription = [@"ファイルのダウンロードに失敗しました。" stringByAppendingString:error.localizedDescription];
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UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"通信エラー" message:errorDescription preferredStyle:UIAlertControllerStyleAlert];
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[alertController addAction:[UIAlertAction actionWithTitle:@"閉じる" style:UIAlertActionStyleDefault handler:nil]];
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dispatch_async(dispatch_get_main_queue(),^{
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[self presentViewController:alertController animated:YES completion:nil];
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});
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decisionHandler(WKNavigationActionPolicyCancel);
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return;
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}
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// PDF以外はとりあえず通すが何が起こっても知らない
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NSHTTPURLResponse *res = (NSHTTPURLResponse*)response;
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if([res.allHeaderFields[@"Content-Type"] compare:@"application/pdf"] != NSOrderedSame) {
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decisionHandler(WKNavigationActionPolicyAllow);
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return;
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}
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NSString * __block filename = @"ダウンロードファイル";
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[[(NSString*)res.allHeaderFields[@"Content-Disposition"] componentsSeparatedByString:@";"] enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
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NSArray<NSString*> *pair = [[obj stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet] componentsSeparatedByString:@"="];
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if([pair[0] compare:@"filename"] != NSOrderedSame) return;
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filename = [pair[1] stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
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if([filename hasPrefix:@"\""]) filename = [filename substringFromIndex:1];
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if([filename hasSuffix:@"\""]) filename = [filename substringToIndex:filename.length - 1];
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}];
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NSString *filePath = [[NSHomeDirectory() stringByAppendingPathComponent:@"tmp/"] stringByAppendingPathComponent:filename];
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[data writeToFile:filePath atomically:YES];
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self.previewFilePath = filePath;
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dispatch_async(dispatch_get_main_queue(),^{
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MyQuickLookViewController* ql = [[MyQuickLookViewController alloc] init];
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[self.navigationController pushViewController:ql animated:YES];
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ql.dataSource = self;
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[ql refreshCurrentPreviewItem];
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});
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decisionHandler(WKNavigationActionPolicyCancel);
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}] resume];
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});
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}
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// MARK: - QuickLook
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- (void)presentQuickLookPreviewController {
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dispatch_async(dispatch_get_main_queue(),^{
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MyQuickLookViewController* ql = [[MyQuickLookViewController alloc] init];
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[self.navigationController pushViewController:ql animated:YES];
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ql.dataSource = self;
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[ql refreshCurrentPreviewItem];
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});
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}
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// MARK: QLPreviewControllerDataSource
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- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController*)previewController {
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return 1;
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}
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/// プレビューするファイルのパスを NSURL で返す
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- (id<QLPreviewItem>)previewController:(QLPreviewController*)controller previewItemAtIndex:(NSInteger)index {
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NSURL *url = [NSURL fileURLWithPath:self.previewFilePath];
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return url;
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}
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```
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