コンパスを動かして、「はてな」の中から宝（丸印）を探し出す。というシンプルなiPhoneゲームを作ってみます。
動作イメージ
XcodeからiOS6 iPhone Simulatorで動かすとこんな感じになります。
サンプルコード
#import “ViewController.h”
#import <QuartzCore/QuartzCore.h>
@interface ViewController () {
UIView *compass;
UIView *arrow;
UIView *treasure;
}
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [self color:2];
[self createTreasure];
[self createCompass];
}
– (void)createCompass
{
compass = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
compass.backgroundColor = [self color:0];
compass.layer.cornerRadius = 25;
compass.layer.borderColor = [self color:1].CGColor;
compass.layer.borderWidth = 4;
[self.view addSubview:compass];
// arrow
arrow = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
arrow.userInteractionEnabled = NO;
[compass addSubview:arrow];
UIBezierPath *arrowPath = [UIBezierPath bezierPath];
[arrowPath moveToPoint:CGPointMake(2, 25)];
[arrowPath addLineToPoint:CGPointMake(25, 21)];
[arrowPath addLineToPoint:CGPointMake(25, 29)];
[arrowPath closePath];
CAShapeLayer *slr = [CAShapeLayer layer];
slr.fillColor = [self color:4].CGColor;
slr.path = arrowPath.CGPath;
[arrow.layer addSublayer:slr];
CAShapeLayer *slg = [CAShapeLayer layer];
slg.fillColor = [self color:1].CGColor;
slg.path = arrowPath.CGPath;
slg.frame = compass.bounds;
slg.transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);
[arrow.layer addSublayer:slg];
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
[compass addGestureRecognizer:pan];
}
– (void)createTreasure
{
int num = arc4random() % 36;
for (int i=0; i<36; i++) {
int x = (i % 6) * 50 + 15;
int y = (i / 6) * 50 + 120;
UILabel *l = [[UILabel alloc] initWithFrame:CGRectMake(x, y, 40, 40)];
l.text = @”?”;
l.font = [UIFont boldSystemFontOfSize:30];
l.textColor = [UIColor whiteColor];
l.backgroundColor = [self color:3];
l.textAlignment = NSTextAlignmentCenter;
[self.view insertSubview:l atIndex:0];
if (i == num) {
treasure = l;
}
l.userInteractionEnabled = YES;
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(openPanel:)];
[l addGestureRecognizer:tap];
}
}
– (void)pan:(UIPanGestureRecognizer*)gr
{
CGPoint p = [gr locationInView:self.view];
if (gr.state == UIGestureRecognizerStateBegan) {
CGPoint p0 = [gr locationInView:compass];
float x = p0.x / compass.bounds.size.width;
float y = p0.y / compass.bounds.size.height;
compass.layer.anchorPoint = CGPointMake(x, y);
}
compass.layer.position = p;
// arrow
float angle = atan2f(compass.center.x – treasure.center.x, treasure.center.y – compass.center.y);
arrow.transform = CGAffineTransformMakeRotation(angle – M_PI * 0.5);
}
– (void)openPanel:(UITapGestureRecognizer*)gr
{
[UIView animateWithDuration:0.3 animations:^{
gr.view.layer.zPosition = 100;
gr.view.layer.transform = CATransform3DMakeRotation(M_PI*0.5, 1, 0, 0);
} completion:^(BOOL finished) {
UILabel *mark = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
mark.font = [UIFont boldSystemFontOfSize:40];
mark.textAlignment = NSTextAlignmentCenter;
mark.backgroundColor = [self color:3];
if (gr.view == treasure) {
// clear
mark.text = @”◎”;
mark.textColor = [UIColor blueColor];
} else {
mark.text = @”×”;
mark.textColor = [UIColor redColor];
}
[gr.view addSubview:mark];
[UIView animateWithDuration:0.3 animations:^{
gr.view.layer.transform = CATransform3DMakeRotation(M_PI, 1, 0, 0);;
} completion:^(BOOL finished) {
gr.view.layer.zPosition = 0;
if (gr.view == treasure) {
// clear
[self performSelector:@selector(reset) withObject:nil afterDelay:1.0];
}
}];
}];
}
– (void)reset
{
for (UIView *v in self.view.subviews) {
if (v != compass) {
[UIView animateWithDuration:0.3 animations:^{
v.transform = CGAffineTransformMakeTranslation(400, 0);
} completion:^(BOOL finished) {
[v removeFromSuperview];
}];
}
}
[self performSelector:@selector(createTreasure) withObject:nil afterDelay:0.4];
}
#define UIColorHex(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
– (UIColor*)color:(int)i
{
switch (i) {
case 0:
return UIColorHex(0x3FB8AF);
case 1:
return UIColorHex(0xCEDBD3);
case 2:
return UIColorHex(0xFEFEFE);
case 3:
return UIColorHex(0xF0E872);
case 4:
return UIColorHex(0xC43128);
default:
break;
}
return nil;
}
– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end