数字をクルクル合わせて、ボタンを押すとガジェットが開いて数式がでてくる！という感じで足し算のお勉強iPhoneアプリのサンプルコードを描いてみます。
今回使った画像（マスク用）
サンプルを動かすとこんな感じです。
サンプルコード
#import “ViewController.h”
@interface ViewController ()
@property (weak, nonatomic) UIView *topNumberDisk;
@property (weak, nonatomic) UIView *bottomNumberDisk;
@property CGPoint touchPoint;
@property (weak, nonatomic ) UIView *selected;
@property CGAffineTransform lastTransform;
@end
@implementation ViewController
– (void)viewDidLoad
{
self.view.backgroundColor = [UIColor greenColor];
[super viewDidLoad];
[self createDisk];
}
– (void)createDisk
{
// top disk and bottom disk
NSArray *maskTypes = @[@”maskA”, @”maskB”];
for (NSString *maskType in maskTypes) {
UIView *disk = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 300)];
disk.center = CGPointMake(CGRectGetMidX(self.view.frame), CGRectGetMidY(self.view.frame));
disk.layer.cornerRadius = disk.frame.size.width * 0.5;
disk.backgroundColor = [UIColor redColor];
[self.view addSubview:disk];
CALayer *mask = [CALayer layer];
mask.frame = disk.bounds;
mask.contents = (id)[UIImage imageNamed:maskType].CGImage;
disk.layer.mask = mask;
[disk addSubview:[self numberDisk]];
if ([maskType isEqual:@”maskA”]) {
self.topNumberDisk = disk;
} else {
self.bottomNumberDisk = disk;
}
}
UIButton *plus = [UIButton buttonWithType:UIButtonTypeSystem];
plus.frame = CGRectMake(0, 0, 80, 80);
plus.center = CGPointMake(150, 150);
plus.titleLabel.font = [UIFont boldSystemFontOfSize:80];
[plus setTitle:@”+” forState:UIControlStateNormal];
[self.bottomNumberDisk addSubview:plus];
[plus addTarget:self action:@selector(calculate) forControlEvents:UIControlEventTouchUpInside];
CGPoint points[] = {CGPointMake(150, 50), CGPointMake(150, 250)};
NSArray *arr = @[self.topNumberDisk, self.bottomNumberDisk];
for (int i=0; i<2; i++) {
UIView *mark = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 60, 60)];
mark.center = points[i];
mark.backgroundColor = [UIColor clearColor];
mark.layer.borderWidth = 5;
mark.layer.borderColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.5].CGColor;
mark.layer.cornerRadius = 10;
mark.userInteractionEnabled = NO;
[arr[i] addSubview:mark];
}
}
#define NumberDiskTag 1
– (UIView*)numberDisk
{
UIView *ndisk = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 280, 280)];
ndisk.tag = NumberDiskTag;
ndisk.center = CGPointMake(150, 150);
ndisk.backgroundColor = [[UIColor whiteColor] colorWithAlphaComponent:0.8];
ndisk.layer.cornerRadius = 140;
for (int i=1; i<10; i++) {
UILabel *l = [[UILabel alloc] init];
l.text = [@(i) stringValue];
l.font = [UIFont systemFontOfSize:60];
l.textColor = [UIColor darkGrayColor];
[l sizeToFit];
float angle = i * (M_PI/4.5);
float x = 100 * cos(angle) + 140;
float y = 100 * sin(angle) + 140;
l.center = CGPointMake(x, y);
l.transform = CGAffineTransformMakeRotation(angle + M_PI/2.0);
[ndisk addSubview:l];
l.userInteractionEnabled = YES;
}
return ndisk;
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint p = [[touches anyObject] locationInView:self.topNumberDisk];
self.touchPoint = p;
UIView *ndisk;
if (p.y < 150)
ndisk = [self.topNumberDisk viewWithTag:NumberDiskTag];
else
ndisk = [self.bottomNumberDisk viewWithTag:NumberDiskTag];
if (CGRectContainsPoint(ndisk.frame, p)) {
self.selected = ndisk;
self.lastTransform = ndisk.transform;
}
}
– (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint p = [[touches anyObject] locationInView:self.topNumberDisk];
float angleA = atan2f(self.touchPoint.x – 150, self.touchPoint.y – 150);
float angleB = atan2f(p.x – 150, p.y – 150);
float deltaAngle = angleA – angleB;
self.selected.transform = CGAffineTransformRotate(self.lastTransform, deltaAngle);
}
– (void)calculate
{
__block void (^aBlock)(void);
CGAffineTransform topTransform;
CGAffineTransform bottomTransform;
if (CGAffineTransformIsIdentity(self.topNumberDisk.transform)) {
[self showExpression];
topTransform = CGAffineTransformMakeTranslation(0, –100);
bottomTransform = CGAffineTransformMakeTranslation(0, 100);
aBlock = ^void{};
} else {
topTransform = CGAffineTransformIdentity;
bottomTransform = CGAffineTransformIdentity;
aBlock = ^void{
UIView *v = [self.view viewWithTag:2];
[v removeFromSuperview];
};
}
[UIView animateWithDuration:1.0 animations:^{
self.topNumberDisk.transform = topTransform;
self.bottomNumberDisk.transform = bottomTransform;
} completion:^(BOOL finished) {
dispatch_async(dispatch_get_main_queue(), aBlock);
}];
}
– (void)showExpression
{
id top = [self.topNumberDisk hitTest:CGPointMake(150, 50) withEvent:nil];
id bottom = [self.bottomNumberDisk hitTest:CGPointMake(150, 250) withEvent:nil];
if ([top isKindOfClass:[UILabel class]] && [bottom isKindOfClass:[UILabel class]]) {
int topNum = [[top text] intValue];
int bottomNum = [[bottom text] intValue];
int answer = topNum + bottomNum;
UILabel *expression = [[UILabel alloc] init];
expression.tag = 2;
expression.text = [NSString stringWithFormat:@”%d + %d = %d”, topNum, bottomNum, answer];
expression.font = [UIFont systemFontOfSize:60];
expression.textColor = [UIColor lightGrayColor];
[expression sizeToFit];
expression.center = self.topNumberDisk.center;
[self.view insertSubview:expression atIndex:0];
}
}
– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end