【代码笔记】iOS-iOS图片的原生（Graphics）

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一，效果图。

二，工程图。

三，代码。

RootViewController.h

#import <UIKit/UIKit.h>@interface RootViewController : UIViewController@end

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