IOS图片的原生（Graphics）详解及实例

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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