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#import <Foundation/Foundationh> @interface PhotoDAO : NSObject { NSString * name; NSInteger photoID; UIImage * photo; } @property (nonatomic, retain) NSString * name; @property (nonatomic, assign) NSInteger photoID; @property (nonatomic, retain) UIImage * photo; @end

This chaining technique is important because an initialization method might return an object that s not the same as the one that was allocated. If you think that s pretty odd, you re right. But it can happen. Why might a programmer want an init method to return a different object If you recall the discussion on class clusters at the end of 8, you saw that classes like NSString and NSArray are really just false fronts for a whole lot of specialized classes. An init method can take arguments, so the method code gets a chance to look at the arguments and decide that another class of object would be more appropriate. For example, let s say a new string is being made from a very long string, or maybe from a string of Arabic characters. Based on this knowledge, the string initializer might decide to create an object of a different class, one better suited to the needs of the desired string, and return that instead of the original object.

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Listing 16-7

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Earlier, we asked you to endure some nod-and-smile moments when we presented initialization methods, mainly because they looked a little weird. Here s the init method from an earlier version of CarParts:

#import "PhotoDAOh" @implementation PhotoDAO @synthesize name; @synthesize photoID; @synthesize photo; - (void) dealloc { [name release]; [photo release]; [super dealloc]; } @end 5 Open PhotosDAOh and import SQLite3 Add a reference to the database you will use

- (id) init { if (self = [super init]) { engine = [Engine new]; tires[0] tires[1] tires[2] tires[3] = = = = [Tire [Tire [Tire [Tire new]; new]; new]; new];

(Listing 16-8)

Firm A 1750% 2795%

(continued)

Formal Protocols Declaring Protocols Adopting a Protocol Implementing a Protocol Carbon Copies Copying Engines Copying Tires Copying the Car Protocols and Data Types Objective-C 20 Goodies Summary 235 236 237 237 237 238 240 242 245 246 247.

Listing 16-8

Firm B 5550%

Making the Project Making the AppController @interface Interface Builder Laying Out the User Interface Making Connections Hook Up the Outlets Hook Up the Actions AppController Implementation Summary 249 252 253 256 258 258 260 262 264.

#import <Foundation/Foundationh> #import <sqlite3h> @interface PhotosDAO : NSObject { sqlite3 *database; } - (NSMutableArray *) getAllPhotos; @end 6 Add a getAllPhotos method to PhotosDAO and implement the method (Listing 16-9)

Listing 16-9

The main weirdness hits you on the very first line:

559%

#import "PhotosDAOh" #import "PhotoDAOh" @implementation PhotosDAO - (NSMutableArray *) getAllPhotos { NSMutableArray * photosArray = [[NSMutableArray alloc] init]; @try { NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *theDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"myDatabasesqlite"]; BOOL success = [fileManager fileExistsAtPath:theDBPath]; if (!success) { NSLog(@"Failed to find database file '%@'", theDBPath); } if (!(sqlite3_open([theDBPath UTF8String], &database) == SQLITE_OK)) { NSLog(@"An error opening database, normally handle error here"); } const char *sql = "SELECT id,name,photo FROM photos"; sqlite3_stmt *statement; if (sqlite3_prepare_v2(database, sql, -1, &statement, NULL) != SQLITE_OK){ NSLog(@"Error, failed to prepare statement, handle error here"); } while (sqlite3_step(statement) == SQLITE_ROW) { PhotoDAO * aPhoto = [[PhotoDAO alloc] init]; aPhotophotoID = sqlite3_column_int(statement, 0); aPhotoname = [NSString stringWithUTF8String:(char *) sqlite3_column_text(statement, 1)];

if (self = [super init]) {

16:

This code implies that self might change Change self in the middle of a method Are we crazy Well, maybe, but not this time The first bit of code that runs in that statement is [super init] That code lets the superclass do its initialization work For classes that inherit from NSObject, calling on the superclass lets NSObject do any processing it needs to do so that objects can respond to messages and deal with retain counts For classes that inherit from another class, this is their chance to do their own version of clean-slate initialization We just said that init methods like this one can return totally different objects Remember that instance variables are found at a memory location that s a fixed distance from the hidden self parameter.

75% 8%

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