iOS: NSKeyedArchiver example

tile.h

@interface ColorTile : NSObject <NSCoding> {
    CGPoint tileOrigin;
    UIColor *tileColor;
}
 
@property(nonatomic) CGPoint tileOrigin;
@property(nonatomic, retain) UIColor *tileColor;
 
@end

tile.m

#import "ColorTile.h"
 
 
@implementation ColorTile
 
@synthesize tileColor, tileOrigin;
 
 
- (void)encodeWithCoder:(NSCoder *)coder {
    [coder encodeObject:self.tileColor forKey:@"TileColor"];
    [coder encodeFloat:self.tileOrigin.x forKey:@"TileOriginX"];
    [coder encodeFloat:self.tileOrigin.y forKey:@"TileOriginY"];
}
 
 
- (id)initWithCoder:(NSCoder *)coder {
    self = [super init];
    if (self != nil) {
        self.tileColor = [coder decodeObjectForKey:@"TileColor"];
        float tx = [coder decodeFloatForKey:@"TileOriginX"];
        float ty = [coder decodeFloatForKey:@"TileOriginY"];
        self.tileOrigin = CGPointMake(tx, ty);
    }
    return self;
}
 
@end

viewcontroller.m

- (void)copy:(id)sender {
    
    // Get the General pasteboard and the current tile.
    UIPasteboard *gpBoard = [UIPasteboard generalPasteboard];
    ColorTile *theTile = [self colorTileForOrigin:currentSelection];
    
    if (theTile) {
        // Create an archive of the ColorTile object as an NSData object.
        NSData *tileData = [NSKeyedArchiver archivedDataWithRootObject:theTile];
        if (tileData)
            // Write the archived data to the pasteboard.
            [gpBoard setData:tileData forPasteboardType:ColorTileUTI];
    }
}