同じ色のカラーブロックに手裏剣があたると、ブロックがくるっと回るようなiPhoneアプリを描いてみます。（Xcodeアップデートしたら、結構変わってた。今日からiOS7で描いてます。）
動作イメージ
XcodeからiOS7 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”
@interface ViewController ()
@property (strong, nonatomic) UIView *shuriken;
@property (strong, nonatomic) NSMutableArray *targets;
@property (nonatomic) CGPoint velocity;
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [self color:3];
[self createTargets];
[self createShuriken];
[self startTimer];
}
– (void)createTargets
{
if (!self.targets) {
self.targets = [[NSMutableArray alloc] init];
}
NSArray *colors = @[ [self color:0], [self color:1], [self color:4]];
for (int i=0; i<3; i++) {
float x = 60 + i * 100;
UIView *target = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 80, 40)];
target.backgroundColor = colors[i];
target.center = CGPointMake(x, 100);
target.layer.shadowColor = [self color:2].CGColor;
target.layer.shadowOffset = CGSizeMake(0, 0);
target.layer.shadowOpacity = 0.8;
target.layer.shadowRadius = 10;
[self.view addSubview:target];
[self.targets addObject:target];
}
}
– (void)createShuriken
{
NSArray *colors = @[ [self color:0], [self color:1], [self color:4]];
UIColor *color = colors[arc4random()%3];
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(20, 0)];
[path addLineToPoint:CGPointMake(25, 15)];
[path addLineToPoint:CGPointMake(40, 20)];
[path addLineToPoint:CGPointMake(25, 25)];
[path addLineToPoint:CGPointMake(20, 40)];
[path addLineToPoint:CGPointMake(15, 25)];
[path addLineToPoint:CGPointMake(0, 20)];
[path addLineToPoint:CGPointMake(15, 15)];
[path closePath];
CAShapeLayer *sl = [CAShapeLayer layer];
sl.fillColor = color.CGColor;
sl.path = path.CGPath;
self.shuriken = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
self.shuriken.center = CGPointMake(160, 400);
[self.shuriken.layer addSublayer:sl];
[self.view addSubview:self.shuriken];
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(shushushu:)];
[self.shuriken addGestureRecognizer:pan];
}
– (void)shushushu:(UIPanGestureRecognizer*)gr
{
self.velocity = [gr velocityInView:self.view];
float v = hypotf(self.velocity.x, self.velocity.y);
if (v > 2000) {
[gr.view removeGestureRecognizer:gr];
}
}
– (void)startTimer
{
[NSTimer scheduledTimerWithTimeInterval:1.0/60.0 target:self selector:@selector(tick:) userInfo:nil repeats:YES];
}
– (void)tick:(NSTimer*)sender
{
if (self.shuriken) {
float x = self.shuriken.center.x + self.velocity.x / 100;
float y = self.shuriken.center.y + self.velocity.y / 100;
self.shuriken.center = CGPointMake(x, y);
if (self.velocity.x != 0 || self.velocity.y !=0) {
self.shuriken.transform = CGAffineTransformRotate(self.shuriken.transform, M_PI*0.1);
}
for (UIView *target in self.targets) {
UIColor *shurikenColor = [UIColor colorWithCGColor:[(CAShapeLayer*)self.shuriken.layer.sublayers[0] fillColor]];
if ([target.backgroundColor isEqual:shurikenColor]
&& CGRectIntersectsRect(self.shuriken.frame, target.frame)
&& self.shuriken.tag == 0
) {
self.shuriken.tag = 1;
[UIView transitionWithView:target duration:0.3 options:UIViewAnimationOptionTransitionFlipFromBottom animations:^{
} completion:^(BOOL finished) {
}];
}
}
if (self.shuriken.center.y < 0) {
self.velocity = CGPointZero;
[self.shuriken removeFromSuperview];
[self createShuriken];
}
}
}
#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(0xFFC8E8);
case 1:
return UIColorHex(0xCB3B66);
case 2:
return UIColorHex(0xF6DD99);
case 3:
return UIColorHex(0xABC680);
case 4:
return UIColorHex(0x313445);
default:
break;
}
return nil;
}
– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end