Sams Teach Yourself Cocoa Touch Programming in 24 Hours Book

Sams Teach Yourself Cocoa Touch Programming in 24 Hours book

(Author: Sengan Baring-Gould, Sams, 9780672331251 / 067233125X, pub date 10/15/2009):

(b) Critical errors

The following errors will hurt the readers' comprehension

Replace "the following line in dealloc" by "the following line called from dealloc"

Replace "Using the notation" by "Using the \uXXXX notation". Replace "You cannot use the notation" by "You cannot use the \uXXXX notation"

Unfortunately the following subsection was moved to Appendix D, but it should have been left on page 86.

(d) Testing String Mutability with Exceptions

We can test a string's mutability as follows. Again don't use this for production code.

BOOLisMutableString(NSString* string)

{

@try

{ [((id) string) setString:string];

returnYES; }

@catch(ide) {}

returnNO;

}

(Casting string to id removes a static type check warning.)

Before "The following getter methods are tried in order", the following sentence is missing:

"NSObject's setValue:forKey: and valueForKey: methods provide Objective-C's keyvaluefunctionality."

"Each IMP Key-Value Observation invokes its superclass" should say "Each IMP Key-Value Observation adds invokes its superclass"

Replace the first occurrence of the following line

#include <mach/mach.h>

#include <mach/mach_time.h

(b) Errors

Replace "of descriptionU" by "of description"

Replace "by the objc_msgSendfunction" by "by the objc_msgSend function".

The following line of code:

returnfunction(arguments);

Should be:

returnfunction(receiver, name, arguments...);

Somehow the code was mislaid out:

history = [[NSMutableStringalloc] initWithCapacity:4096];

[historyrelease]; history = nil; // history has no setter

- (void) updateScreen:(float)value;

{ textView.text = [NSStringstringWithFormat:@"%@%g", history, value]; }

(There are spaces missing between NSMutableString and alloc, and between NSString and stringWithFormat)

In the @interface declaration, the method name should start with toySetValue: rather than setValue:

Replace "Threads might not" by "Threads may not"

w = 1-z/Z isaseparateequationandshouldbeplacedafterthepreviousequation

- page 284: In figure 12.4b, the box with the x in it should be a curved line (almost like an n).

Replace "sqlite3_close(*db);" by "sqlite3_close(db);"

(b) Rephrase for clarity in the second edition

Replace "super also points to the method's object" by "super points to the same object as self"

Replace "The dealloc method closes any files the object owns and releases any objects it owns" by "The dealloc method should close any files the object owns and release any objects it owns"

Replace "The s2s type helps" by "The s2s type coercion helps"

Replace "To do this, add the following to @implementation" by "To do this, add the following to the @implementation block"

Replace "If I request accessors to be @synthesize" by "If I request accessors to be @synthesized"

Replace "invoking layoutIfNeeded on each" by "invoking layoutIfNeeded on each view".

Replace "when one or more fingers touch down on the screen" by "when one or more fingers touch the screen".