「ios開発」グラフィックス関係Graphicsを利用するコード

1.RootViewController.h
#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end
2.RootViewController.m
#import “RootViewController.h”

@interface RootViewController ()

@end

@implementation RootViewController

– (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}

– (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.

//背景画像
[self addView];

}

#pragma -mark -functions
//背景画像
-(void)addView
{
UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(50, 100, 44, 44)];
imageView.image=[self defaultImage];
[self.view addSubview:imageView];
}
//defaultImage画像
-(UIImage *)defaultImage {

static UIImage *defaultImage = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
UIGraphicsBeginImageContextWithOptions(CGSizeMake(20.f, 13.f), NO, 0.0f);

[[UIColor blackColor] setFill];
[[UIBezierPath bezierPathWithRect:CGRectMake(0, 0, 20, 1)] fill];
[[UIBezierPath bezierPathWithRect:CGRectMake(0, 5, 20, 1)] fill];
[[UIBezierPath bezierPathWithRect:CGRectMake(0, 10, 20, 1)] fill];

[[UIColor whiteColor] setFill];
[[UIBezierPath bezierPathWithRect:CGRectMake(0, 1, 20, 2)] fill];
[[UIBezierPath bezierPathWithRect:CGRectMake(0, 6, 20, 2)] fill];
[[UIBezierPath bezierPathWithRect:CGRectMake(0, 11, 20, 2)] fill];

defaultImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

});
return defaultImage;
}

– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

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