Just a couple notes here, nothing earth shattering.

If you have a custom UITableViewCell with controls of some sort and you want to know in which cell a the value of a control changed, there are a few ways, one of which is bad, one of which is good.

bad:

UITableViewCell *cell = controlItem.superview;

This is dependent on the framework implementation at the time and in fact does not work for iOs 7 & 8. In those versions you would use:

controlItem.superview.superview

The fragility of this is obvious, especially if you’re not thinking and implement it on a custom UITableViewCell that has a different hierarchy.

A typically better way to approach the problem is some form of this:

- (UITableViewCell *)cellForControl:(UIControl *)control {  
    while (view != nil) {  
        if ([view isKindOfClass:[UITableViewCell class]]) {  
            return view;  
        }  
        view =

It is often the case that we need to persist a few bits of info or at least a single object, like a “user”. Core data is too big for this, NSUserDefaults is sometimes not the best practice use case, and does not provide compiler auto-completion. The correct way is to create a (singleton) object for the data, and use [NSKeyedArchiver][appleDoc] for persistence, which is not super fast, but is straightforward and speed does not matter for small classes like this. It is not hard to use, but there are a few things that you have to do correctly. For a quick refresher, there are lots of examples, but this one is [fine][exampleTedious]

1. provide a method to encode each property of the object by encodeForKey by giving it an NSString key that is the same name as the property.
2. Provide a method to decode each property the same way.

This leads to two problems:

1. Must manually match the @“keyName”...

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