The document provides an overview of the file system layout and paths for applications on iOS. It discusses how each app has its own home directory containing the app bundle and documents. It also describes how to access common paths like the documents directory and temporary directory. The document then covers using SQLite databases to store and retrieve data, parsing XML, and working with JSON.

1. Разработка приложений
для iPhone и iPad
занятие #8

2. песочница

3. а что внутри?
Home Directory Layout
• Each app has its own set of directories
я!
• <Application Home> ельз
! MyApp.app т ьн
е ня
! MyApp -м
! MainWindow.nib
! SomeImage.png
! Documents - добавления здесь!
! Library
! Caches
! Preferences
• Applications only read and write within their home directory
• Backed up by iTunes during sync (mostly)

4. File Paths in Your Application
File Paths in Your Application
// Basic directories
путь к документам
NSString *homePath = NSHomeDirectory();
// Basic directories NSTemporaryDirectory();
NSString *tmpPath =
NSString *homePath = NSHomeDirectory();
// Documents directory
NSString *tmpPath = NSTemporaryDirectory();
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
// Documents directory
NSArray *paths = NSSearchPathForDirectoriesInDomains
NSString *documentsPath = [paths objectAtIndex:0];
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
// <Application Home>/Documents/foo.plist
NSString *fooPath =
// <Application stringByAppendingPathComponent:@“foo.plist”];
[documentsPath Home>/Documents/foo.plist
NSString *fooPath =
[documentsPath stringByAppendingPathComponent:@“foo.plist”];
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5. SQLite!
• база в файле
• нет сервера
• простая реализация
• включена в iPhone

6. 6 шагов
• находим файл базы
• подключаемся - sqlite3_open
• создаем запрос
• готовим, проверяем - sqlite3_prepare_v2
• выполняем - sqlite3_step
• завершаем - sqlite3_finalize
• закрываем -
sqlite3_close

7. шаг 0 - создать БД
$ sqlite3 ex1
SQLite version 3.6.11
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> create table tbl1(one varchar(10), two smallint);
sqlite> insert into tbl1 values('hello!',10);
sqlite> insert into tbl1 values('goodbye', 20);
sqlite> select * from tbl1;
hello!|10
goodbye|20
sqlite>

8. подготовка
#import <sqlite3.h>
NSString *databaseName = @"Cocktails.sql";
NSArray *documentPaths =
NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,
YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *databasePath = [documentsDir
stringByAppendingPathComponent:databaseName];
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
success = [fileManager fileExistsAtPath:databasePath];
if(!success) {
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath]
stringByAppendingPathComponent:databaseName];
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath
error:nil];
[fileManager release];
}

9. чтение
sqlite3 *database;
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
const char *sqlStatement = "select * from cocktail;";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) ==
SQLITE_OK) {
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
int anId = sqlite3_column_int(compiledStatement, 0);
NSString *aName = [NSString stringWithUTF8String:(char
*)sqlite3_column_text(compiledStatement, 1)];
//...
}
}
sqlite3_finalize(compiledStatement);
}
sqlite3_close(database);

10. запись
• просто sqlite3_step(compiledStatement),
при удаче - SQLITE_DONE

11. Google
Maps API Facebook API
Яндекс Карты
API
Twitter API общение с
вашим сервером

12. xml
<?xml version="1.0" encoding="UTF-8" ?>
<painting>
<img src="madonna.jpg" alt='Foligno Madonna, by
Raphael'/>
<caption>This is Raphael's "Foligno" Madonna, painted in
<date>1511</date>–<date>1512</date>.
</caption>
</painting>

13. xml
NSURL *xmlURL = [NSURL URLWithString:URL];
NSXMLParser * rssParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];
[rssParser setDelegate:self];
[rssParser parse];
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
attributes:(NSDictionary *)attributeDict
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
- (void)parserDidEndDocument:(NSXMLParser *)parser {

14. What does a JSON object look like?
json
{
“instructor” : “Josh Shaffer”,
“students” : 60,
“itunes-u” : true,
“midterm-exam” : null,
“assignments” : [ “WhatATool”,
“HelloPoly”,
“Presence” ]
}
• NSDictionary *result = [jsonString JSONValue];
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15. http://empatika.com
oleg.parinov@empatika.com