Is there any way for me to make it so when a user clicks on an image that is in a TTStyledLabel it opens up in three20's image viewer?
Basically yes. Since TTStyledText can contain html tags you can harness the three20 navigation to you your advantage, all you have to do is wrap the img tag with a tag and set your own mapping for a controller that derives from three20's photo viewer.
NSString* kText = @"This is a test of styled labels. <a href=\"yourapp://photo/http%3A%2F%2Fsomeserver.com%2Fsmiley.png\"><img src=\"http://someserver.com/smiley.png\"/</a>";
TTStyledTextLabel* label1 = [[[TTStyledTextLabel alloc] init] autorelease];
label1.text = [TTStyledText textFromXHTML:kText lineBreaks:YES URLs:YES];
in your app delegate have a mapping for your controller like this:
TTNavigator* navigator = [TTNavigator navigator];
TTURLMap* map = navigator.URLMap;
[map from:@"yourapp://photoViewer/(initWithPhotoUrl:)" toViewController:[TTWebController class]];
the the photo view controller should have this init method:
-(id)initWithPhotoUrl:(NSString*)photoURL {
self = [self initWithNibName:nil bundle:nil];
if (self) {
NSString *unencodedURL = [photoURL gtm_stringByUnescapingFromURLArgument];//this is where you decode the string (notice we encode it in the html). Google toolbox has a nice category for Strings to encode and decode urls see: http://code.google.com/p/google-toolbox-for-mac/source/browse/trunk/Foundation/GTMNSString%2BURLArguments.h?r=373
}
return self;
}
Inside that initWithPhotoUrl: you need to create a photosource - please refer to the TTCatalog sample for a sample on how to create a MockPhotoSource.