ボタンを押すと、ブタさんの口の中においた蚊取り線香が燃えていく、というiPhoneアプリを作ってみます。
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。
ポイント
１０秒くらいで燃え尽きるようにします。蚊取り線香は、UIBezierPathを使って螺旋状に書いています。CAShapeLayerは緑色用、燃え尽きた灰色用、燃えている赤色の３つをよういして、CABasicAnimationを使って燃えた感じを出すようにしました。
#import “ViewController.h”
#import <QuartzCore/QuartzCore.h>
@interface ViewController () {
CAShapeLayer *sl;
UIBezierPath *path;
}
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor brownColor];
[self createKatoriSenko];
[self createPigBox];
[self createButton];
}
– (void)createKatoriSenko
{
path = [[UIBezierPath alloc] init];
[path moveToPoint:CGPointMake(160, 300)];
float d = M_PI / 180.0;
float r = 10;
float th = 0;
float a = 0.7;
for (int i = 0; i<360 * 4; i++) {
float x = r * pow(th, a) * cos(th) + 160;
float y = r * pow(th, a) * sin(th) + 300;
[path addLineToPoint:CGPointMake(x, y)];
th += d;
}
sl = [[CAShapeLayer alloc] init];
sl.fillColor = [UIColor clearColor].CGColor;
sl.strokeColor = [UIColor greenColor].CGColor;
sl.lineWidth = 10;
sl.path = path.CGPath;
sl.transform = CATransform3DMakeRotation(M_PI * 0.3, 1, 0, 0);
sl.zPosition = 100;
[self.view.layer addSublayer:sl];
}
– (void)createPigBox
{
UIView *box = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 300)];
box.backgroundColor = [UIColor colorWithRed:1 green:0.7 blue:0.7 alpha:1];
[self.view addSubview:box];
UIView *nose = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 220, 220)];
nose.center = CGPointMake(160, 170);
nose.layer.cornerRadius = 110;
nose.backgroundColor = [UIColor blackColor];
nose.layer.borderColor = [UIColor colorWithRed:1 green:0.6 blue:0.6 alpha:1].CGColor;
nose.layer.borderWidth = 20;
[box addSubview:nose];
CGRect p[] = {CGRectMake(50, 20, 40, 40), CGRectMake(230, 20, 40, 40)};
for (int i=0; i<2; i++) {
UIView *eye = [[UIView alloc] initWithFrame:p[i]];
eye.layer.cornerRadius = 20;
eye.backgroundColor = [UIColor blackColor];
[box addSubview:eye];
}
CGRect p2[] = {CGRectMake(20, 300, 40, 40), CGRectMake(260, 300, 40, 40)};
for (int i=0; i<2; i++) {
UIView *foot = [[UIView alloc] initWithFrame:p2[i]];
foot.backgroundColor = box.backgroundColor;
[box addSubview:foot];
}
}
– (void)createButton
{
float w = 220;
float h = w / 1.618;
UILabel *startBtn = [[UILabel alloc] initWithFrame:CGRectMake(50, 370, w, h)];
startBtn.layer.borderColor = [UIColor whiteColor].CGColor;
startBtn.layer.borderWidth = 10;
startBtn.backgroundColor = self.view.backgroundColor;
startBtn.text = @”Fire”;
startBtn.textAlignment = NSTextAlignmentCenter;
startBtn.textColor = [UIColor whiteColor];
startBtn.font = [UIFont fontWithName:@”Marker Felt” size:80];
[self.view addSubview:startBtn];
startBtn.userInteractionEnabled = YES;
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(fire)];
[startBtn addGestureRecognizer:tap];
}
– (void)fire
{
CAShapeLayer *red = [[CAShapeLayer alloc] init];
red.fillColor = [UIColor clearColor].CGColor;
red.strokeColor = [UIColor redColor].CGColor;
red.lineWidth = sl.lineWidth;
red.transform = sl.transform;
red.path = path.CGPath;
red.strokeStart = 0;
red.strokeEnd = 0.01;
red.zPosition = 101;
CABasicAnimation *strokeS = [CABasicAnimation animationWithKeyPath:@”strokeStart”];
strokeS.fromValue = @0.98;
strokeS.toValue = @0;
CABasicAnimation *strokeE = [CABasicAnimation animationWithKeyPath:@”strokeEnd”];
strokeE.fromValue = @1.0;
strokeE.toValue = @0.02;
CAAnimationGroup *group = [CAAnimationGroup animation];
group.duration = 10.0;
group.animations = [NSArray arrayWithObjects:strokeS, strokeE, nil];
[red addAnimation:group forKey:nil];
CAShapeLayer *ash = [[CAShapeLayer alloc] init];
ash.fillColor = [UIColor clearColor].CGColor;
ash.strokeColor = [UIColor lightGrayColor].CGColor;
ash.lineWidth = sl.lineWidth;
ash.transform = sl.transform;
ash.path = path.CGPath;
ash.strokeStart = 0;
ash.strokeEnd = 1;
ash.zPosition = 101;
CABasicAnimation *toashes = [CABasicAnimation animationWithKeyPath:@”strokeStart”];
toashes.fromValue = @1;
toashes.toValue = @0;
toashes.duration = 10.1;
[ash addAnimation:toashes forKey:nil];
[self.view.layer addSublayer:red];
[self.view.layer addSublayer:ash];
[self performSelector:@selector(restart) withObject:nil afterDelay:12];
}
– (void)restart
{
self.view.layer.sublayers = nil;
[self createKatoriSenko];
[self createPigBox];
[self createButton];
}
– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end