Errata

Since 4.4.1 (?) the @synthesize directive doesn't automatically get created in the implementation file.

So, the instance variable "helloButton" in the showAlert: method needs changing to "_helloButton" to work correctly.

[helloButton setTitle
should be
[_helloButton setTitle


code will not compile as printed in book

The instructions do not lead to a Wrapping Text Field whose height expands and contracts with the height of the window. In fact I can't seem to get it to grow vertically no matter what I try. A Wrapping Text View (not Field, as instructed at the bottom of page 82) seems to resize vertically, but not the Field.

If the steps on this page were prefaced with "Create an iOS app", I would have been right. I assumed that a "Single-View Application" would be a plain Mac App with one window (since the previous example was a Mac App, I continued down that path).

Point 6 could also do with some words around having to drag from the appropriate items in the Connections Inspector to the View Controller in the pane to the left of the main canvas.

The following has been corrected for Xcode 4.6.3

1. Create a new 'Single View Application', iOS project.
2. Select the MainStoryboard and add a 'Table View' object from the Objects library.
3. Use the Control key to drag select on to the View Controller icon and connect both the 'dataSource' and 'delegate' Outlets.
4. Add a 'Table View Cell' object from the Objects library and position it at the top of the screen.
5. Change the 'Table View Cell' object attributes to Style: Basic, Identifier: IconCell and Selection: None.
6. Ignore.
7. Open the ViewController.h in the Assistant and make the ViewController conform to the following protocol:
UITableViewDataSource, UITableViewDelegate
@interface ViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>
8. Add a new Outlet under the @interface by control-dragging from the View Controller icon (Main Storyboard) back to the ViewController.h and call it tableView:
@property (weak, nonatomic) IBOutlet UITableView *tableView;

Missing "@" symbol before the word "property", which I noticed and corrected. I mistakenly thought an asterisk was missing also from the "NSInteger numberValue" part, but NSInteger is, in fact, a primitive type. If you add an asterisk the program will crash and complain about it not being compliant with key-value coding. Were it not for the missing "@" symbol I might have copied/pasted verbatim and not fell into this trap.

The line:
"property (assign) NSInteger numberValue;"
should have a leading @ symbol.

@property (assign) NSInteger numberValue;

"Remember that the AppDelegate object now has a property, called val ue, which stores an integer" is incorrect. The property is called 'numberValue'.

"The key that we want to bind to is value, because that?s the name of the property in the app delegate object" is incorrect. The key is "numberValue".

We need to bind the "data" value to for the NSTextView. This could be clarified.

AppDelegate.m needs to import "Song.h" in order for the Song object to be available.

I couldn't control drag either of these two things onto the other until I continued the steps up to page 188; when I ran the program, nothing happened, but only after completing the remaining steps would XCode allow me to control-drag the app delegate onto the array controller. Something (not sure which) has to be done first before you can do this.

textField should be _textField, unless you also direct readers to synthesize textField at the top of page 201.

When you control-drag from the spinner to AppDelegate.h, it creates the following line:

@property (weak) IBOutlet NSProgressIndicator *spinner;

The code excerpt on page 228 changes the line to:

@property (weak) IBOutlet NSLayoutConstraint *spinner;

When makes these lines on p. 229 not compile:

[self.spinner stopAnimation:nil];

[self.spinner startAnimation:nil];

What control-dragging creates is correct, and is what is in the downloadable example source.

So, when this sample app is launched, the spinner does not spin. As a matter of fact, the only way the spinner starts spinning is if there is an error. I added

[self.spinner startAnimation:nil];

as the first line in applicationDidFinishLaunching:


- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
[self.spinner startAnimation:nil];

_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
[_locationManager startUpdatingLocation];
}

Doesn't look like the source code for TextEdit comes with XCode any more. It can be downloaded here: http://developer.apple.com/library/mac/#samplecode/TextEdit/Introduction/Intro.html