ケーキを人数分に切り分けると、おおきさはどのくらいになるかな？というiPhoneアプリを描いてみます。
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”
#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]
@interface ViewController ()
@property (strong, nonatomic) CAShapeLayer *cakeShapeLayer;
@property (strong, nonatomic) NSMutableArray *pict;
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = UIColorHex(0x4faac7);
[self createCake];
[self addMan:35];
[self createStepper];
}
– (void)createCake
{
UIView *cake = [[UIView alloc] initWithFrame:CGRectMake(10, 50, 300, 300)];
cake.layer.cornerRadius = 150;
cake.backgroundColor = [UIColor blackColor];
[self.view addSubview:cake];
self.cakeShapeLayer = [CAShapeLayer layer];
self.cakeShapeLayer.lineWidth = 2;
self.cakeShapeLayer.fillColor = [UIColor clearColor].CGColor;
self.cakeShapeLayer.strokeColor = [UIColor whiteColor].CGColor;
[cake.layer addSublayer:self.cakeShapeLayer];
}
– (void)createStepper
{
UIStepper *stepper = [[UIStepper alloc] init];
stepper.center = CGPointMake(160, 500);
stepper.stepValue = 1;
stepper.minimumValue = 1;
stepper.maximumValue = 6;
[self.view addSubview:stepper];
[stepper addTarget:self action:@selector(changeStepper:) forControlEvents:UIControlEventValueChanged];
}
– (void)changeStepper:(UIStepper*)sender
{
if (sender.value > [self.pict count]) {
float x = 50 * sender.value – 15;
[self addMan:x];
} else {
[[self.pict lastObject] removeFromSuperview];
[self.pict removeLastObject];
}
[self cutCake:[self.pict count]];
}
– (void)addMan:(float)x
{
UIImageView *pictiv = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@”man”]];
pictiv.center = CGPointMake(x, 440);
[self.view addSubview:pictiv];
[self.pict addObject:pictiv];
}
– (NSMutableArray*)pict
{
if (!_pict) {
_pict = [[NSMutableArray alloc] init];
}
return _pict;
}
– (void)cutCake:(int)number
{
CGPoint o = CGPointMake(150, 150);
UIBezierPath *path = [UIBezierPath bezierPath];
for (int i=1; i<number; i++) {
if (i == 1) {
float x = 150.0 * cos(0) + o.x;
float y = 150.0 * sin(0) + o.y;
[path moveToPoint:o];
[path addLineToPoint:CGPointMake(x, y)];
}
float angle = i * 2.0 * M_PI / (float)number;
float x = 150.0 * cos(angle) + o.x;
float y = 150.0 * sin(angle) + o.y;
[path moveToPoint:o];
[path addLineToPoint:CGPointMake(x, y)];
}
self.cakeShapeLayer.path = path.CGPath;
}
– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end