- (BOOL)webView:(UIWebView *)webView2
shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType {
NSString *requestString = [[request URL] absoluteString];
NSArray *components = [requestString componentsSeparatedByString:@":"];
if ([components count] > 1 &&
[(NSString *)[components objectAtIndex:0] isEqualToString:@"myapp"]) {
if([(NSString *)[components objectAtIndex:1] isEqualToString:@"myfunction"])
{
NSLog([components objectAtIndex:2]); // param1
NSLog([components objectAtIndex:3]); // param2
// Call your method in Objective-C method using the above...
}
return NO;
}
return YES; // Return YES to make sure regular navigation works as expected.
}
Hacky: yes. Gets the job done: yes
Disabling the selection flash
Once you do the above steps, you are basically mostly on your way to have a functioning application that makes use of UIWebView as a component. But as any good IPhone application, you need to add more polish and get rid of the user annoyances.
The first annoyance is, what happens when you tap inside the UIWebView control that is hosting an SVG file. There is a default behavior that happens for all image files, including SVG files. The background of the image (including the border area) flashes quickly to some default grayish color.
Turns out there is a way to turn this off through the use of the WebKit CSS property -webkit-tap-highlight-color, and setting the alpha of the color to 0, in my Javascript code does the trick:
document.documentElement.style.webkitTapHighlightColor = "rgba(0,0,0,0)";
Disabling the “action” pop-up
The second thing I needed to disable is the “action” popup that appears if you tap and hold the contents of the UIWebView for a few seconds. This is also controlled through a CSS property called -webkit-touch-callout, and setting that to “none” in this case does the trick:
document.documentElement.style.webkitTouchCallout = "none";
Disabling default zoom effect
The final user annoyance I had was the zooming effect that happens by default, when you double tap the content area. Well for many applications this may be a desired effect, but in my case, I needed to disable the zooming. I was hoping that there is another CSS property that is something like webkit-disable-doubletap-zoom but unfortunately no such property exists (at least as of this writing.)
The only other idea I came up with was to be able to detect double tapping and calling the standardpreventDefault on the event when that touch happens in my Javascript code. But it turns out that SVG DOM does not at the moment fully implement the touch and gesture events. You should be able to use those when you are hosting regular HTML though.
The final approach I came up with was to be able to intercept the touch events before they even reach UIWebView and stop them in my Objective-C code. To do this, you need to read a bit more about how thetouch events are routed in Cocoa. (Requires login to the IPhone Dev Center) Basically the idea is to override the hit testing part of the UIWebView and detect the double tap there. In order to that I subclassed UIWebView and overrode the hitTest method in my implementation. Other than that I keep it up the superclass to do the rest.
-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
NSSet *touches = [event allTouches];
BOOL forwardToSuper = YES;
for (UITouch *touch in touches) {
if ([touch tapCount] >= 2) {
// prevent this
forwardToSuper = NO;
}
}
if (forwardToSuper){
//return self.superview;
return [super hitTest:point withEvent:event];
}
else {
// Return the superview as the hit and prevent
// UIWebView receiving double or more taps
return self.superview;
}
}
So this finally did the trick and I was able to prevent the double tap zooming effect as well.
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