Trouble getting this to work in a UIViewController about webviewjavascriptbridge HOT 6 CLOSED

Can anyone please offer some advice on getting this to work with UIViewController?

from webviewjavascriptbridge.

Could you please provide some more context about this issue so that we can
try and help you?

from webviewjavascriptbridge.

I'm having trouble thinking of what else I can offer as far as context. I would definitely explain more if I knew what else to provide. Is it possible for you to try and use Marcus' instructions from the README inside a UIViewController. https://github.com/marcuswestin/WebViewJavascriptBridge#setup--examples-ios--osx maybe I can post some code.

MyViewController.h
#import <UIKit/UIKit.h>
#import <QuartzCore/CoreAnimation.h>
#import "WebViewJavascriptBridge.h"
@interface MyViewController : UIViewController
@EnD

MyViewController.m
#import "MyViewController.h"

@interface MyViewController()

• (NSUInteger) screenNumber;
  @EnD

@implementation MyViewController

• (void)viewDidAppear:(BOOL)animated {

  self.view.backgroundColor = [UIColor whiteColor];

  NSUInteger screenNumber = [self screenNumber];

  NSLog(@"screen: %lu", (unsigned long)screenNumber);

  UIWebView *webView = [[UIWebView alloc] initWithFrame:self.view.bounds];

  if (screenNumber == 1){
  NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"stopwatch" ofType:@"html" inDirectory:@"/stopwatch"]];
  [webView loadRequest:[NSURLRequest requestWithURL:url]];
  } else {
  NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"watchdisplay" ofType:@"html" inDirectory:@"/stopwatch"]];
  [webView loadRequest:[NSURLRequest requestWithURL:url]];
  }

  [self.view addSubview:webView];

  WebViewJavascriptBridge *_bridge = [WebViewJavascriptBridge bridgeForWebView:webView webViewDelegate:self handler:^(id data, WVJBResponseCallback responseCallback) {
  NSLog(@"ObjC received message from JS: %@", data);
  responseCallback(@"Response for message from ObjC");
  }];

  [_bridge registerHandler:@"testObjcCallback" handler:^(id data, WVJBResponseCallback responseCallback) {
  NSLog(@"testObjcCallback called: %@", data);
  responseCallback(@"Response from testObjcCallback");
  }];

  [_bridge send:@"A string sent from ObjC before Webview has loaded." responseCallback:^(id responseData) {
  NSLog(@"objc got response! %@", responseData);
  }];

  [_bridge callHandler:@"testJavascriptHandler" data:@{ @"foo":@"before ready" }];

  [_bridge send:@"A string sent from ObjC after Webview has loaded."];
  }

• (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
  {
  // Return YES for supported orientations
  return (interfaceOrientation == UIInterfaceOrientationPortrait);
  }

• (void) handleMessage:(NSString*) message fromWebView: (UIWebView *)theWebView{
  }

• (NSUInteger) screenNumber {
  NSUInteger result = 1;
  UIWindow *_window = nil;
  UIScreen *_screen = nil;
  NSArray *_screens = nil;

  _screens = [UIScreen screens];

  if ([_screens count] > 1){
  _window = [[self view] window];
  _screen = [_window screen];
  if (_screen != nil){
  for(size_t i = 0; i < [_screens count]; ++i){
  UIScreen *_currentScreen = [_screens objectAtIndex:i];
  if (_currentScreen == _screen){
  result = i+1;
  }
  }
  }
  }
  return result;
  }
  @EnD

from webviewjavascriptbridge.

Hi @Theorian,

I updated the repo's example iOS app to use a UIViewController. That should give you a working example to build off of.

Cheers!
Marcus

from webviewjavascriptbridge.

Thank you so much :)

from webviewjavascriptbridge.

BTW the error seems to be the way you instantiate the bridge. You're doing this, which requires a delegate and your class to implement it:

WebViewJavascriptBridge *_bridge = [WebViewJavascriptBridge bridgeForWebView:webView webViewDelegate:self handler:^(id data, WVJBResponseCallback responseCallback) {
NSLog(@"ObjC received message from JS: %@", data);
responseCallback(@"Response for message from ObjC");
}];

Instead, you should use the other form of instantiation that does not use a delegate, like detailed in the instruction by Marcus:

WebViewJavascriptBridge* bridge = [WebViewJavascriptBridge bridgeForWebView:webView handler:^(id data, WVJBResponseCallback responseCallback) {
    NSLog(@"Received message from javascript: %@", data);
    responseCallback(@"Right back atcha");
}];

Cheers!

Valerio

from webviewjavascriptbridge.