iPhone SDK 3 Programming: Advanced Mobile Development for by Maher Ali

By Maher Ali

I purchased this publication simply because i used to be suffering from a few aspect with navigation controllers. The publication appeared to have the reply. unfortunately the 1st instance I checked out is defective. In bankruptcy nine, web page 278 is the code line self.navigationItem.backBarButtonItem.title = @"Shows"; this is often an try to supply a name to a backBarButtonItem that doesn't exist on the root point of the navigation hierarchy. web page 276 exhibits a screenshot with out the button or its very unlikely label, so the writer must have picked up that the code used to be no longer operating. extra into the nav hierarchy, the booklet (and downloaded resource code from which I copied and pasted those code snippets), attempts to call the backBarButtonItem back. e.g. self.navigationItem.backBarButtonItem.title = [delegate showNameAtIndex:delegate.selectedShow.row]; (p280 within the book). this doesn't paintings, regardless of its outstanding sophistication. The again bar button identify is derived from the name of the view from which we moved. (The screenshots on p276 and 277 convey that this code line is useless and pointless, the navcontroller did all of the paintings besides. back, the writer must have realised that the code used to be now not operating, since it is apparent from the screenshots he supplied.) i've got experimented with commenting out traces of his code and am happy that there's a conceptual blunders right here. it can appear to be an important conceptual blunders, judging from the variety of blogs, chat groups and so on in this very subject. After a number of days being affected by this, I reviewed the Apple pattern code back, and at last realised my conceptual error-shared, it's going to appear, with many others.
The NavBar pattern code from Apple is apparent on the best way to get out of a navigation hierarchy. The "Done" button all of us sought after right here might be organize in a chain like this:

- (id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)nibBundle {

if (self = [super initWithNibName:nibName bundle:nibBundle]) {
self.wantsFullScreenLayout = NO;
self.title = @"Intervals";
UIBarButtonItem *addButton = [[[UIBarButtonItem alloc]
initWithTitle:(@"Done")
style:UIBarButtonItemStyleBordered
target:self
action:@selector(doneAction:)] autorelease];
self.navigationItem.rightBarButtonItem = addButton;
}
go back self;
}

- (void)doneAction:(id)sender
{
// the performed button used to be clicked, deal with it here
}

That having been acknowledged, as a pastime programmer who has been having enjoyable because the days of Fortran four, i discovered the introductory sections of the booklet lucid and positively further worth over the freely on hand documentation from Apple. occasionally we want somebody to tug stuff jointly, to choose the foremost stuff. partly, this e-book does that. it's also very jam-packed with examples and distinguishes itself from related books through the variety and usability of the examples.
Pity in regards to the profound blunders within the bankruptcy i began with. i am hoping it's the just one, simply because I will probably be carrying on with to exploit this e-book.

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Additional info for iPhone SDK 3 Programming: Advanced Mobile Development for Apple iPhone and iPod touch (Wiley)

Sample text

Since the assigned value is nil, and all messages sent to nil result in nil, no harm is done and we achieve our goal. This approach of releasing instance variables is found by many to be superior to releasing the instance variable directly and setting its value to nil. delegate = nil; [super dealloc]; } @end An instance of the class A, shown below, creates an instance of class X and retains it. It then sets the delegate of the X instance to self. This is a typical situation that arises frequently if you think of class X as a view and class A as another view that uses it.

2 The Employee class declaration and definition demonstrating Objective-C properties. = aName){ [name release]; name = [aName copy]; } } The getter accessor returns a reference to the name instance variable. The setter accessor first checks to see if the new value for name is not the same as the current name value. If they are different, then the old object is released, and a copy (as instructed by the @property directive) of the aName is made and stored in the name instance variable. Note that in the dealloc method, you need to release name.

3) on NSString; thus making every NSString object capable of drawing itself. 3 An example of a Cocoa category defined on NSString for the purpose of drawing. @interface NSString(UIStringDrawing) - (CGSize)drawAtPoint:(CGPoint)point withFont:(UIFont *)font; - (CGSize)drawAtPoint:(CGPoint)point forWidth:(CGFloat)width withFont:(UIFont *)font lineBreakMode:(UILineBreakMode)lineBreakMode; ... 6 Posing Posing is part of the Objective-C language, but is not available on the device. 11 for alternatives to posing.

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