我如何绑定到NSString？

Question

This question was asked before , but its not answered.

I can bind to objects like so:

[[aCellView textField] bind:@"stringValue"
                               toObject:myObject
                            withKeyPath:@"text"
                                options:nil]];

This works easy because i have a myObject.text value. But how do i bind to NSString?

[[aCellView textField] bind:@"stringValue"
                               toObject:aString
                            withKeyPath:@""  // What should the keyPath be?
                                options:nil]];

Answer 1

You can bind to individual objects, but not temporaries. One of the reasons why we bind to key paths is to have a little more sense about the lifetime of the variable, and therefore, the binding. Make aString a property of the calling object, and bind to self with aString as the key path:

[[aCellView textField] bind:NSValueBinding toObject:self withKeyPath:@"aString" options:@{}];