バスに何人乗っているか数えてみよう！という感じのiPhoneアプリのサンプルコードを描いてみます。
動かすとこんな感じです
サンプルコード
#import “ViewController.h”
@interface ViewController ()
@property (nonatomic, weak) UIView *redBus;
@property (nonatomic, weak) UIView *greenBus;
@property (nonatomic, strong) NSMutableArray *pushBehaviorArr;
@property (nonatomic, strong) UIDynamicAnimator *animator;
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
[self createLabel];
[self createBus];
[self createPuppets];
[self setupAnimator];
UIButton *start = [UIButton buttonWithType:UIButtonTypeSystem];
[start setTitle:@”START” forState:UIControlStateNormal];
start.titleLabel.font = [UIFont boldSystemFontOfSize:50];
[start sizeToFit];
start.center = CGPointMake(160, 430);
[self.view addSubview:start];
[start addTarget:self action:@selector(startPush) forControlEvents:UIControlEventTouchUpInside];
}
– (void)createLabel
{
UILabel *logo = [[UILabel alloc] init];
logo.font = [UIFont systemFontOfSize:100];
logo.textColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.5];
logo.text = @”How many”;
[logo sizeToFit];
logo.center = CGPointMake(160, 250);
logo.transform = CGAffineTransformMakeRotation(M_PI/4.0);
[self.view addSubview:logo];
}
– (void)createBus
{
self.redBus = [self createBus:[UIColor redColor]];
self.redBus.center = CGPointMake(350, 100);
self.greenBus = [self createBus:[UIColor greenColor]];
self.greenBus.center = CGPointMake(350, 300);
}
– (UIView *)createBus:(UIColor *)color
{
UIView *bus = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 150, 80)];
bus.backgroundColor = color;
[self.view addSubview:bus];
for (int i=0; i<6; i++) {
float w = CGRectGetMaxX(bus.bounds) / 3.3;
float x = (i % 3) * w + 10;
float y = (i / 3) * w*0.6 + 10;
UIView *v = [[UIView alloc] initWithFrame:CGRectMake(x, y, w*0.8, w*0.5)];
v.tag = 1;
v.backgroundColor = [UIColor whiteColor];
[bus addSubview:v];
}
for (int i=0; i<2; i++) {
float x = i * 100 + 10;
UIView *tire = [[UIView alloc] initWithFrame:CGRectMake(x, 70, 30, 30)];
tire.layer.cornerRadius = 15;
tire.backgroundColor = [UIColor blackColor];
[bus addSubview:tire];
}
return bus;
}
– (void)createPuppets
{
NSMutableArray *windows = [NSMutableArray array];
[windows addObjectsFromArray:self.redBus.subviews];
[windows addObjectsFromArray:self.greenBus.subviews];
[windows enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
UIView *v = (UIView*)obj;
BOOL rand = arc4random() % 2 == 1;
if (v.tag == 1 && rand) {
UIView *face = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 12, 12)];
face.backgroundColor = [UIColor blackColor];
face.layer.cornerRadius = 6;
face.center = CGPointMake(CGRectGetMidX(v.bounds), CGRectGetMidY(v.bounds));
[v addSubview:face];
UIView *body = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 15, 5)];
body.center = CGPointMake(CGRectGetMidX(v.bounds), CGRectGetMidY(v.bounds) + 10);
body.backgroundColor = face.backgroundColor;
[v addSubview:body];
}
}];
}
– (void)setupAnimator
{
UIDynamicAnimator *animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
self.pushBehaviorArr = [NSMutableArray array];
for (UIView *bus in @[self.redBus, self.greenBus]) {
UIPushBehavior *pushBehavior = [[UIPushBehavior alloc] initWithItems:@[bus] mode:UIPushBehaviorModeContinuous];
pushBehavior.angle = 0.0;
[animator addBehavior:pushBehavior];
[self.pushBehaviorArr addObject:pushBehavior];
}
self.animator = animator;
}
– (void)startPush
{
for (UIPushBehavior *pushBehavior in self.pushBehaviorArr) {
int v = (arc4random() % 20) * 0.2;
pushBehavior.magnitude = – v – 0.5;
}
[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(check:) userInfo:nil repeats:YES];
}
– (void)check:(NSTimer *)sender
{
if (!CGRectIntersectsRect(self.view.frame, self.redBus.frame)
&& !CGRectIntersectsRect(self.view.frame, self.greenBus.frame)) {
[sender invalidate];
[self performSelector:@selector(reset) withObject:nil afterDelay:2.0];
}
}
– (void)reset
{
[self.view.subviews enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
[obj removeFromSuperview];
}];
[self createLabel];
[self createBus];
[self createPuppets];
[self setupAnimator];
UIButton *start = [UIButton buttonWithType:UIButtonTypeSystem];
[start setTitle:@”START” forState:UIControlStateNormal];
start.titleLabel.font = [UIFont boldSystemFontOfSize:50];
[start sizeToFit];
start.center = CGPointMake(160, 430);
[self.view addSubview:start];
[start addTarget:self action:@selector(startPush) forControlEvents:UIControlEventTouchUpInside];
}
– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end