mirror of
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144 lines
5.0 KiB
Objective-C
144 lines
5.0 KiB
Objective-C
//
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// FLEXWebViewController.m
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// Flipboard
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//
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// Created by Ryan Olson on 6/10/14.
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// Copyright (c) 2020 FLEX Team. All rights reserved.
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//
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#import "FLEXWebViewController.h"
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#import "FLEXUtility.h"
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#import <WebKit/WebKit.h>
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@interface FLEXWebViewController () <WKNavigationDelegate>
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@property (nonatomic) WKWebView *webView;
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@property (nonatomic) NSString *originalText;
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@end
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@implementation FLEXWebViewController
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- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
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self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
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if (self) {
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WKWebViewConfiguration *configuration = [WKWebViewConfiguration new];
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if (@available(iOS 10.0, *)) {
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configuration.dataDetectorTypes = WKDataDetectorTypeLink;
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}
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self.webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:configuration];
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self.webView.navigationDelegate = self;
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}
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return self;
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}
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- (id)initWithText:(NSString *)text {
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self = [self initWithNibName:nil bundle:nil];
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if (self) {
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self.originalText = text;
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NSString *html = @"<head><style>:root{ color-scheme: light dark; }</style>"
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"<meta name='viewport' content='initial-scale=1.0'></head><body><pre>%@</pre></body>";
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// Loading message for when input text takes a long time to escape
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NSString *loadingMessage = [NSString stringWithFormat:html, @"Loading..."];
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[self.webView loadHTMLString:loadingMessage baseURL:nil];
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// Escape HTML on a background thread
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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NSString *escapedText = [FLEXUtility stringByEscapingHTMLEntitiesInString:text];
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NSString *htmlString = [NSString stringWithFormat:html, escapedText];
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// Update webview on the main thread
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dispatch_async(dispatch_get_main_queue(), ^{
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[self.webView loadHTMLString:htmlString baseURL:nil];
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});
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});
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}
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return self;
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}
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- (id)initWithURL:(NSURL *)url {
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self = [self initWithNibName:nil bundle:nil];
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if (self) {
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NSURLRequest *request = [NSURLRequest requestWithURL:url];
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[self.webView loadRequest:request];
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}
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return self;
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}
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- (void)viewDidLoad {
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[super viewDidLoad];
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[self.view addSubview:self.webView];
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self.webView.frame = self.view.bounds;
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self.webView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
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if (self.originalText.length > 0) {
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self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]
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initWithTitle:@"Copy" style:UIBarButtonItemStylePlain target:self action:@selector(copyButtonTapped:)
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];
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}
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}
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- (void)copyButtonTapped:(id)sender {
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[UIPasteboard.generalPasteboard setString:self.originalText];
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}
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#pragma mark - WKWebView Delegate
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- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction
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decisionHandler:(void (^)(WKNavigationActionPolicy))handler {
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WKNavigationActionPolicy policy = WKNavigationActionPolicyCancel;
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if (navigationAction.navigationType == WKNavigationTypeOther) {
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// Allow the initial load
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policy = WKNavigationActionPolicyAllow;
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} else {
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// For clicked links, push another web view controller onto the navigation stack
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// so that hitting the back button works as expected.
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// Don't allow the current web view to handle the navigation.
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NSURLRequest *request = navigationAction.request;
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FLEXWebViewController *webVC = [[[self class] alloc] initWithURL:request.URL];
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webVC.title = request.URL.absoluteString;
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[self.navigationController pushViewController:webVC animated:YES];
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}
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handler(policy);
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}
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#pragma mark - Class Helpers
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+ (BOOL)supportsPathExtension:(NSString *)extension {
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BOOL supported = NO;
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NSSet<NSString *> *supportedExtensions = [self webViewSupportedPathExtensions];
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if ([supportedExtensions containsObject:extension.lowercaseString]) {
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supported = YES;
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}
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return supported;
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}
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+ (NSSet<NSString *> *)webViewSupportedPathExtensions {
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static NSSet<NSString *> *pathExtensions = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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// Note that this is not exhaustive, but all these extensions should work well in the web view.
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// See https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/CreatingContentforSafarioniPhone/CreatingContentforSafarioniPhone.html#//apple_ref/doc/uid/TP40006482-SW7
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pathExtensions = [NSSet<NSString *> setWithArray:@[
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@"jpg", @"jpeg", @"png", @"gif", @"pdf", @"svg", @"tiff", @"3gp", @"3gpp", @"3g2",
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@"3gp2", @"aiff", @"aif", @"aifc", @"cdda", @"amr", @"mp3", @"swa", @"mp4", @"mpeg",
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@"mpg", @"mp3", @"wav", @"bwf", @"m4a", @"m4b", @"m4p", @"mov", @"qt", @"mqv", @"m4v"
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]];
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});
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return pathExtensions;
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}
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@end
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