blog.seiji.me | seiji.me

Custom Class

Stanford大学のiPhoneアプリケーション開発講座が公開されているので、やってみようと思います。この中のLecture 3 - Custom Classes, PropertiesのAssignment2A。

iPhone Application Programming

さすがstanfordなのか資料を見るだけでも教え方がよさそうだなと感じます。ここの学生はうらやましいです。

PolygonShape.h

#import 

@interface PolygonShape : NSObject {
	int numberOfSides;
	int minimumNumberOfSides;
	int maximumNumberOfSides;
}

@property int numberOfSides;
@property int minimumNumberOfSides;
@property int maximumNumberOfSides;
@property (readonly) float angleInDegrees;
@property (readonly) float angleInRadians;
@property (readonly) NSString *name;

- (id)init;
- (id)initWithNumberOfSides:(int)sides minimumNumberOfSides:(int)min maximumNumberOfSides:(int)max;
- (NSString *)description;
- (void)dealloc;

@end

PolygonShape.m

#import "PolygonShape.h"

@implementation PolygonShape

@synthesize numberOfSides;
@synthesize minimumNumberOfSides;
@synthesize maximumNumberOfSides;

- (id)init
{
	self = [self initWithNumberOfSides:5 minimumNumberOfSides:3 maximumNumberOfSides:10];
	return self;
}
- (id)initWithNumberOfSides:(int)sides minimumNumberOfSides:(int)min maximumNumberOfSides:(int)max
{
	if ( (self =[super init]) != nil) {
		[self setMinimumNumberOfSides:min];
		[self setMaximumNumberOfSides:max];
		[self setNumberOfSides:sides];
        NSLog(@"Initialized with min %d, max %d and number %d",
			  [self minimumNumberOfSides],
			  [self maximumNumberOfSides],
			  [self numberOfSides]
		);
	}
	return self;
}

-(void)setMaximumNumberOfSides:(int)maxNum
{
	if (maxNum > 12) {
		NSLog(@"%d is larger than 12", maxNum);
		return;
	}
	maximumNumberOfSides = maxNum;
}

-(void)setMinimumNumberOfSides:(int)minNum
{
	if (minNum < 2) {
		NSLog(@"%d is less than 2", minNum);
		return;
	}
	minimumNumberOfSides = minNum;
}

- (void)setNumberOfSides:(int)numSides
{
	if (numSides < minimumNumberOfSides) {
		NSLog(@"Invalid number of sides: %d is larger than the minimum number of%d allowed", numSides, minimumNumberOfSides);
		return;
	}
	if (numSides > maximumNumberOfSides) {
		NSLog(@"Invalid number of sides: %d is less than the maximum number of %d allowed", numSides, maximumNumberOfSides);
		return;
	}
	numberOfSides = numSides;
}

- (float)angleInDegrees
{
	float angleInDegrees = (180 * (numberOfSides - 2) / numberOfSides);
	return angleInDegrees;
}
- (float)angleInRadians
{
	float angleInDegrees = (180 * (numberOfSides - 2) / numberOfSides);
	return angleInDegrees * M_PI / 180.0;
}

- (NSString *)name
{
	static NSString *names[] = {
		nil,
		@"Henagon",
		@"Digon",
		@"Triangle",
		@"Quadrilateral",
		@"Pentagon",
		@"Hexagon",
		@"Octogon",
		@"Heptagon",
		@"Enneagon",
		@"Decagon",
		@"Hendecagon",
		@"Dodecagon"
	};

	return names[numberOfSides];
}

- (NSString *)description
{
	return [NSString stringWithFormat:@"Hello I am a %d-sided polygon (aka a %@) with angles of %lf degrees (%lf radians)",
		  numberOfSides,
		  [self name],
		  [self angleInDegrees],
		  [self angleInRadians]
	];
}
- (void)dealloc {
	NSLog(@"PolygonShape dealloc");
	[super dealloc];
}
@end

WhatATool.m

#import 
#import "PolygonShape.h"

/* Section 1 */
void PrintPathInfo() {
	NSString *path = @"~";
	path = [path stringByExpandingTildeInPath];
	NSLog(@"My home is at '%@'", [path pathComponents]);
}

/* Section 2 */
void PrintProcessInfo() {
	NSProcessInfo *info = [NSProcessInfo processInfo];
	NSLog(@"Process Name: '%@' Process ID: '%d'", [info processName], [info processIdentifier]);
}

/* Section 3 */
void PrintBookMarkInfo() {
	NSMutableDictionary *bookmark = [NSMutableDictionary dictionary];
	[bookmark setObject:[NSURL URLWithString:@"http://www.stanford.edu"]
				 forKey:@"Stanford University"];
	[bookmark setObject:[NSURL URLWithString:@"http://www.apple.com"]
				 forKey:@"Apple"];
	[bookmark setObject:[NSURL URLWithString:@"http://cs193p.stanford.edu"]
				 forKey:@"CS193P"];
	[bookmark setObject:[NSURL URLWithString:@"http://itunes.stanford.edu"]
				 forKey:@"Stanford on iTunes U"];
	[bookmark setObject:[NSURL URLWithString:@"http://stanfordshop.com"]
				 forKey:@"Stanford Mail"];

	NSEnumerator *enumKey = [bookmark keyEnumerator];
	NSString *key;
	while ( key = [enumKey nextObject]) {
		if ([key hasPrefix:@"Stanford"]) {
			NSLog(@"Key: '%@' URL: '%@'", key, [bookmark objectForKey:key]);
		}
	}
}
/* Section 4 */
void PrintIntrospectionInfo() {
	NSMutableArray *ary = [NSMutableArray array];
	[ary addObject:@"Hello World!"];
	[ary addObject:[NSURL URLWithString:@"http://www.apple.com"]];
	[ary addObject:[NSDictionary dictionary]];
	for (id tmp in ary) {
		NSLog(@"Class name: %@", [tmp className]);
		NSLog(@"Is Member of NSString: %d", [tmp isMemberOfClass:[NSString class]]);
		NSLog(@"Is Kind of NSString: %d", [tmp isKindOfClass:[NSString class]]);
		NSLog(@"Responds to lowercaseString: %d", [tmp respondsToSelector:@selector(lowercaseString)]);
		if ([tmp respondsToSelector:@selector(lowercaseString)]){
			NSLog([tmp performSelector:@selector(lowercaseString)]);
		}
		NSLog(@"===========================");
	}
}

/* Section 6 */
void PrintPolygonInfo() {

	NSMutableArray *array = [[[NSMutableArray alloc] init] autorelease];
	PolygonShape *pol = [[PolygonShape alloc] initWithNumberOfSides:4 minimumNumberOfSides:3 maximumNumberOfSides:7];
	[array addObject:pol];
	[pol release];
	NSLog(@"%@", [pol description]);
	pol = [[PolygonShape alloc] initWithNumberOfSides:6 minimumNumberOfSides:5 maximumNumberOfSides:9];
	[array addObject:pol];
	[pol release];
	NSLog(@"%@", [pol description]);
	pol = [[PolygonShape alloc] initWithNumberOfSides:12 minimumNumberOfSides:9 maximumNumberOfSides:12];
	[array addObject:pol];
	[pol release];

	// test the constraints
	for (PolygonShape *tmp in array) {
		[tmp setNumberOfSides:10];
	}
}
int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

	PrintPolygonInfo();
	[pool drain];
    return 0;
}

Assignmentはちゃんと満たしてますでしょうか？　//