Trouble getting this to work in a UIViewController

[Theorian]

I tried this from what I read in some other issues. But there seems to be no protocol defined.

@interface MyViewController : UIViewController

So I tried:

@interface MyViewController : UIViewController

this still doesn't do anything. Following your instruction worked fine from my appdelegate. but whenever I bring it over to a viewcontroller it doesn't even log any output

[Theorian]

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

[tanis2000]

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

[Theorian]

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

[marcuswestin]

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

[Theorian]

Thank you so much :)

[tanis2000]

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