遊園地のコーヒーカップみたいな動きをするiPhoneアプリのサンプルコードを描いてみます。
#import “ViewController.h”
@interface ViewController ()
@property (nonatomic, weak) UIView *coffeeTable;
@property (nonatomic, weak) NSTimer *timer;
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor colorWithWhite:0.96 alpha:1];
[self createCoffeeTable];
}
#define Radius MIN(CGRectGetMaxX(self.view.bounds), CGRectGetMaxY(self.view.bounds))
– (void)createCoffeeTable
{
float r = Radius;
UIView *coffeeTable = [[UIView alloc] initWithFrame:CGRectMake(0, 0, r, r)];
coffeeTable.backgroundColor = [UIColor colorWithHue:0.3 saturation:0.9 brightness:1 alpha:1];
coffeeTable.layer.cornerRadius = r * 0.5;
coffeeTable.center = CGPointMake(160, 220);
[self.view addSubview:coffeeTable];
self.coffeeTable = coffeeTable;
for (int i=0; i<3; i++) {
float x = r * 0.26 * cos(i * M_PI * (2.0/3.0)) + r * 0.5;
float y = r * 0.26 * sin(i * M_PI * (2.0/3.0)) + r * 0.5;
[self createCoffePlateAtPoint:CGPointMake(x, y)];
}
}
– (void)createCoffePlateAtPoint:(CGPoint)p
{
float r = 0.43 * Radius;
UIView *coffeePlate = [[UIView alloc] initWithFrame:CGRectMake(0, 0, r, r)];
coffeePlate.backgroundColor = [UIColor colorWithHue:0.3 saturation:0.4 brightness:0.8 alpha:1];
coffeePlate.layer.cornerRadius = r * 0.5;
coffeePlate.center = p;
[self.coffeeTable addSubview:coffeePlate];
for (int i=0; i<3; i++) {
float x = r * 0.26 * cos(i * M_PI * (2.0/3.0)) + r * 0.5;
float y = r * 0.26 * sin(i * M_PI * (2.0/3.0)) + r * 0.5;
[self createCupOn:coffeePlate AtPoint:CGPointMake(x, y) angle:i * M_PI * 2.0/3.0];
}
}
– (UIView *)createCupOn:(UIView *)plate AtPoint:(CGPoint)p angle:(float)angle
{
float r = 0.4 * 0.4 * Radius;
UIView *coffeeCup = [[UIView alloc] initWithFrame:CGRectMake(0, 0, r, r)];
coffeeCup.backgroundColor = [UIColor whiteColor];
coffeeCup.layer.cornerRadius = r * 0.5;
coffeeCup.center = p;
[plate addSubview:coffeeCup];
CALayer *handle = [CALayer layer];
handle.frame = CGRectMake(r*0.4, 4, 8, –12);
handle.backgroundColor = [UIColor whiteColor].CGColor;
handle.cornerRadius = 4;
[coffeeCup.layer addSublayer:handle];
CALayer *coffee = [CALayer layer];
coffee.frame = CGRectInset(coffeeCup.bounds, 4, 4);
coffee.cornerRadius = (r – 8) * 0.5;
coffee.backgroundColor = [UIColor brownColor].CGColor;
[coffeeCup.layer addSublayer:coffee];
coffeeCup.transform = CGAffineTransformMakeRotation(angle);
return coffeeCup;
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(turn) userInfo:nil repeats:YES];
}
– (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.timer invalidate];
self.timer = nil;
}
– (void)turn
{
[self.view.subviews enumerateObjectsUsingBlock:^(UIView *table, NSUInteger idx, BOOL *stop) {
table.transform = CGAffineTransformRotate(table.transform, 0.02);
[table.subviews enumerateObjectsUsingBlock:^(UIView *plate, NSUInteger idx, BOOL *stop) {
plate.transform = CGAffineTransformRotate(plate.transform, –0.05);
[plate.subviews enumerateObjectsUsingBlock:^(UIView *cup, NSUInteger idx, BOOL *stop) {
cup.transform = CGAffineTransformRotate(cup.transform, 0.1);
}];
}];
}];
}
@end