아이폰 앱 개발 팁(8) : Stanford Lecture #9

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> Stanford Lecture #9

* Reading property lists

- (id)initWithContentsOfFile:(NSString *)aPath;

- (id)initWithContentsOfURL:(NSURL *)aURL;

* Writing property lists

- (BOOL)writeToFile:(NSString *)aPath atomically:(BOOL)flag;

- (BOOL)writeToURL:(NSURL *)aURL atomically:(BOOL)flag;

* Writing an array to disk

NSArray *array = [NSArray arrayWithObjects:@"Foo", [NSNumber numberWithBool:YES], [NSDate dateWithTimeIntervalSinceNow:60], nil];

[array writeToFile:@"MyArray.plist" atomically:YES];

* Writing a dictionary to disk

NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"Name", @"Evan", @"Lecture", [NSNumber numberWithInt:9], nil];

[dict writeToFile:@"MyDict.plist" atomically:YES];

* Property list to NSData

+ (NSData *)dataFromPropertyList:(id)plist format:(NSPropertyListFormat)format errorDescription:(NSString *)errorString;

* NSData to property list

+ (id)propertyListFromData:(NSData *)data mutabilityOption:(NSPropertyListMutabilityOptions)opt format:(NSPropertyListFormat *)format errorDescription:(NSString *)errorString;

* Basic directories

NSString *homePath = NSHomeDirectory();

NSString *tmpPath = NSTemporaryDirectory();

* Documents directory

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsPath = [paths objectAtIndex:0];

* <Application Home>/Documents/foo.plist

NSString *fooPath = [documentsPath stringByAppendingPathComponent:@"foo.plist"];

* Encode an object for an archive

- (void)encodeWithCoder:(NSCoder *)coder{

[super encodeWithCoder:coder];

[coder encodeObject:name forKey:@"Name"];

[coder encodeInteger:numberOfSides forKey:@"Sides"];

}

* Decode an object from an archive

- (id)initWithCoder:(NSCoder *)coder{

self = [super initWithCoder:coder];

name = [[coder decodeObjectForKey:@"Name"] retain];

numberOfSides = [coder decodeIntegerForKey:@"Sides"];

}

* Creating an archive

NSArray *polygons = ...;

NSString *path = ...;

BOOL result = [NSKeyedArchiver archiveRootObject:polygons toFile:path];

* Decoding an archive

NSArray *polygons = nil;

NSString *path = ...;

polygons = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

* Open the database

int sqlite3_open(const char *filename, sqlite3 **db);

* Execute a SQL statement

int sqlite3_exec(sqlite3 *db, const char *sql, int (*callback)(void*, int, char**, char**), void *context, char **error);

* Close the database

int sqlite3_close(sqlite3 *db);

* Options for parsing XML

libxml2 vs. NSXMLParser

* Reading a JSON string into Foundation objects

#import <JSON/JSON.h>

NSString *jsonString = ...;

id object = [jsonString JSONValue];

* Writing a JSON string from Foundation objects

NSDictionary *dictionary = ...;

jsonString = [dictionary JSONRepresentation];