markohlebar / bind Goto Github PK

I found it's empty and there's something difficult for me

BINDINGS don't work well with subclasses. Need to inspect how to add the bindings from a superclass in the subclass.

• create a log all bindings class method for debugging purposes
• better log messages

Could you please point out how a two way binding can be done with a ViewModel and UITextField. From the example given it is quite easy to figure out the left to right assignments, but how can the right to left assignment be done.

I tried something like this, but this didn't make any change in the view model.
BINDViewModel(point,<>, pointField.text)

Thanks.

-> is reserved syntax, and triggers code completion when writing bindings like
BIND(self, leftKeypath, ->
which is quite annoying.

• protocols and categories instead of concrete BNDView / BNDViewController subclasses for MVVM
• dropping XIB support because of the first point
• dropping data controllers
• adding abstractions BNDTableViewController and BNDCollectionViewController to support rapid development
• splitting BNDBinding and MVVM related implementation into separate projects

BINDT(self.viewModel, booleanProperty , ~>, self, other.booleanProperty, NSNegateBooleanTransformerName)

causes:
-[__NSCFConstantString transformedValue:]: unrecognized selector sent to instance 0x7fd34b395700

Sometimes you want to cancel the transform i.e. when getting images from a web service.

Great job on this library. I've only used it for a week but I could see it being a library I can reuse over and over on different projects.

I've got a question regarding model to view model bindings where the model is a Core Data managed object. The issue I'm seeing happens when the managed objects gets faulted, causing the binding to output a null value. I don't want the view model to change a property to null when its model object gets faulted.

This isn't a defect in the library but I'm wondering if you have an answer for how to correctly handle object faulting with view to view model binding.

It seems that the usage really boils down to BINDViewModel and BIND.
In terms of simplifying the interface we should trim unnecessary features like
shorthands BINDSL, BINDSR, BINDOS and BINDS which clutter the DSL and
autocompletion.

Is there a way to get the bindings to work on a UITextField while the user types?
With a simple example I've been unable to get the binding to fire when typing into the UITextField. It works find if I actually set the .text value manually.

UILabel *title = [UILabel new];
title.text = @"empty title";

UITextField field = [[UITextField alloc] init];
field.text = @"empty field";
//..
BIND(item, value, <>, field, text);

[BINDO(field, text) observe:^(id observable, id value) {
            NSLog(@"value=%@", value); // any way to have this called as I type?
}];

//.. 
field.text = @"this works though";

Previously to experimenting with BIND I'd use addTarget:forControlEvents:UIControlEventEditingChanged to trigger a selector as the user types.

A more 'BINDy' way to do this would be great. Any ideas?

Shorthand check should check for "viewModel. " instead of "viewModel"