Common Errors
Debugging Tools
TableViews
Storyboards
Keyboard Shortcuts
100
"Value is not key-value coding compliant for the key overviewLabel"
What is/caused the issue?
Broken IBOutlets. You deleted the outlet in the code but forgot to delete in the Storyboard, or vice versa.
100
Where do errors appear in Xcode?
(Where do we look to find them?)
The "Log" (the right half of the bottom pane in Xcode)
100
Which delegate method in the ViewController.m tells the tableview how many cells to show?
[tableView numberOfRowsInSection: ...];
100
This view is used to display any text on the screen.
UILabel
100
This runs the app again
Cmd+R
200
Unrecognized selector sent to instance
Calling a function that does not exist.
Or, Broken IBAction. You deleted the IBAction function in the code but forgot to delete in the Storyboard, or vice versa.
200
A method that prints any string to the error console.
NSLog()
200
Two lines of code you need in your ViewController.m's [viewDidLoad... ] method in order to power a TableView.
self.tableView.dataSource = self;
self.tableView.delegate = self;
200
What does a segue do?
Navigate from one screen to another.
200
This comments-out your highlighted code
Cmd+/
300
What's wrong with this code block?
(tableview isn't reloading)
"[tableView reloadData];" call happens too soon.
It needs to be moved to line 42-43 to wait until new tweets are loaded from the server before reloading the tableView.
300
How to freeze the app at one line of code, to inspect the current value of variables at that moment in time?
Breakpoints
300
Which delegate method in your ViewController.m tells the tableView how to configure the content within a cell, just before the cell is displayed on the screen?
[tableView cellForRowAt...]
300
This type of controller is used to display a Back button on top of each screen embedded within it.
UINavigationController
300
Quickly search for a file in your project
Cmd+Shift+O
400
Incompatible pointer types assigning to 'UITableViewDelegate *' from 'MoviesViewController *'
Forgot to implement the <UITableViewDelegate> protocol.
400
You see an error about "overviewLabel" in your log, and want to narrow down where the problematic code must be.
What's the keyboard shortcut to search the whole project for any phrase like "overviewLabel" ?
Cmd+Shift+F
400
Which delegate method can be created to handle what happens when a user taps on your tableView cell?
[tableView didSelectRowAtIndexPath...]
400
The type of view/element that we used to select and change the Tip amount %
UISegmentedControl
400
Clean your project
Cmd+Shift+K
500
You get a super vague "signal SIGABRT" in AppDelegate.
What dynamic/specialized breakpoint can you add to narrow down the issue to a specific 
line of your code.
Exception Breakout in the Breakpoint Navigator (left pane)
500
You get a super vague "signal SIGABRT" in AppDelegate.
How do you add an Exception Breakout to your project to help narrow down the issue to a specific erroneous line of your code?
500
(for those who are looking ahead and checked out Week 2 things)
When using Auto Layout to make a cell's height dynamic based on the length of the Tweet within it, what line of code is required in your ViewController.m to tell the TableView that the rowHeight should be Automatic?
500
To design a single TableView Cell that can be re-used in multiple Storyboards across your app, you can design that Cell in a ___ file.
XIB file
500
This opens the side-by-side Assistant Editor
Ctrl+Option+Cmd+Enter