react-native/React/Views/RCTWebView.m

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
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#import "RCTWebView.h"
#import <UIKit/UIKit.h>
#import "RCTAutoInsetsProtocol.h"
#import "RCTEventDispatcher.h"
#import "RCTLog.h"
#import "RCTUtils.h"
#import "RCTView.h"
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#import "UIView+React.h"
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NSString *const RCTJSNavigationScheme = @"react-js-navigation";
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@interface RCTWebView () <UIWebViewDelegate, RCTAutoInsetsProtocol>
@property (nonatomic, copy) RCTDirectEventBlock onLoadingStart;
@property (nonatomic, copy) RCTDirectEventBlock onLoadingFinish;
@property (nonatomic, copy) RCTDirectEventBlock onLoadingError;
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@end
@implementation RCTWebView
{
UIWebView *_webView;
NSString *_injectedJavaScript;
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}
- (instancetype)initWithFrame:(CGRect)frame
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{
if ((self = [super initWithFrame:frame])) {
super.backgroundColor = [UIColor clearColor];
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_automaticallyAdjustContentInsets = YES;
_contentInset = UIEdgeInsetsZero;
_webView = [[UIWebView alloc] initWithFrame:self.bounds];
_webView.delegate = self;
[self addSubview:_webView];
}
return self;
}
RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
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- (void)goForward
{
[_webView goForward];
}
- (void)goBack
{
[_webView goBack];
}
- (void)reload
{
[_webView reload];
}
- (NSURL *)URL
{
return _webView.request.URL;
}
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- (void)setURL:(NSURL *)URL
{
// Because of the way React works, as pages redirect, we actually end up
// passing the redirect urls back here, so we ignore them if trying to load
// the same url. We'll expose a call to 'reload' to allow a user to load
// the existing page.
if ([URL isEqual:_webView.request.URL]) {
return;
}
if (!URL) {
// Clear the webview
[_webView loadHTMLString:@"" baseURL:nil];
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return;
}
[_webView loadRequest:[NSURLRequest requestWithURL:URL]];
}
- (void)setHTML:(NSString *)HTML
{
[_webView loadHTMLString:HTML baseURL:nil];
}
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- (void)layoutSubviews
{
[super layoutSubviews];
_webView.frame = self.bounds;
}
- (void)setContentInset:(UIEdgeInsets)contentInset
{
_contentInset = contentInset;
[RCTView autoAdjustInsetsForView:self
withScrollView:_webView.scrollView
updateOffset:NO];
}
- (void)setBackgroundColor:(UIColor *)backgroundColor
{
CGFloat alpha = CGColorGetAlpha(backgroundColor.CGColor);
self.opaque = _webView.opaque = (alpha == 1.0);
_webView.backgroundColor = backgroundColor;
}
- (UIColor *)backgroundColor
{
return _webView.backgroundColor;
}
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- (NSMutableDictionary *)baseEvent
{
NSMutableDictionary *event = [[NSMutableDictionary alloc] initWithDictionary: @{
@"url": _webView.request.URL.absoluteString ?: @"",
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@"loading" : @(_webView.loading),
@"title": [_webView stringByEvaluatingJavaScriptFromString:@"document.title"],
@"canGoBack": @(_webView.canGoBack),
@"canGoForward" : @(_webView.canGoForward),
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}];
return event;
}
- (void)refreshContentInset
{
[RCTView autoAdjustInsetsForView:self
withScrollView:_webView.scrollView
updateOffset:YES];
}
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#pragma mark - UIWebViewDelegate methods
- (BOOL)webView:(__unused UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request
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navigationType:(UIWebViewNavigationType)navigationType
{
if (_onLoadingStart) {
// We have this check to filter out iframe requests and whatnot
BOOL isTopFrame = [request.URL isEqual:request.mainDocumentURL];
if (isTopFrame) {
NSMutableDictionary *event = [self baseEvent];
[event addEntriesFromDictionary: @{
@"url": (request.URL).absoluteString,
@"navigationType": @(navigationType)
}];
_onLoadingStart(event);
}
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}
// JS Navigation handler
return ![request.URL.scheme isEqualToString:RCTJSNavigationScheme];
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}
- (void)webView:(__unused UIWebView *)webView didFailLoadWithError:(NSError *)error
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{
if (_onLoadingError) {
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if ([error.domain isEqualToString:NSURLErrorDomain] && error.code == NSURLErrorCancelled) {
// NSURLErrorCancelled is reported when a page has a redirect OR if you load
// a new URL in the WebView before the previous one came back. We can just
// ignore these since they aren't real errors.
// http://stackoverflow.com/questions/1024748/how-do-i-fix-nsurlerrordomain-error-999-in-iphone-3-0-os
return;
}
NSMutableDictionary *event = [self baseEvent];
[event addEntriesFromDictionary: @{
@"domain": error.domain,
@"code": @(error.code),
@"description": error.localizedDescription,
}];
_onLoadingError(event);
}
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}
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
if (_injectedJavaScript != nil) {
[webView stringByEvaluatingJavaScriptFromString:_injectedJavaScript];
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}
// we only need the final 'finishLoad' call so only fire the event when we're actually done loading.
if (_onLoadingFinish && !webView.loading && ![webView.request.URL.absoluteString isEqualToString:@"about:blank"]) {
_onLoadingFinish([self baseEvent]);
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}
}
@end