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Fill observer signed

Swift scholars we're gonna learn about property observers and have another EU challenge not only you don't learn about property observers but we'll cover why they can improve your code and can make for good programming practice well show you how to resize sf symbols if used inside of a button and we'll finish off another EU challenge its property observer time so set your site's awesomeness now we're gonna make our code a little bit more efficient by using something called property observers so property observers are called every time that a variables value changes you can think of these almost like functions that are attached to a particular value or particular variable and every time that value changes the lines of code inside the property observer will execute now property observers are in curly braces right after the variable has been declared and it will include one or both of these subsections also set off by curly braces will set that's called it just before the value is changed and did set that's called immediately after a value has been changed so this is how we're gonna use property observers in our code inside of lists table view cell we're gonna declare a variable called to-do item which is of type to-do item and we're gonna attach a property observer to it and every time the value to-do item changes will update name label dot text and check box button is selected with the new properties inside of to-do item now where do we update to-do item well we'll do that right inside of cell for row at now that's inside of our viewcontroller file but to do list view controller this will let us cut out the two lines inside a cell for row at the update of the name label dot text and check box button dot is selected and by putting them both inside of didset which is inside list table view cell our custom cell file we modularize our code the code around updating the interface for our new custom cell is all inside of that custom cell file and anytime our main view controller makes a change to the to-do item that displays data in that cell but we'll pass that data over to the cell so that the user interface is updated some important rules are on property observers they don't run if the value is initialized right when it's declared and even if a value is updated with the same value the property observer is gonna fire so if you've updated properties with the same exact value that was in there already it'll still count as an update the didset will still function now why is this useful well for a bunch of reasons one is it supports simultaneous development it's really easy to assign a program or a block of code that you know she or he is gonna work on it so hey you were responsible for the table...