iOS8 生成二维码与条形码

//
//  ViewController.m
//  CodeCreator
//
//  Created by YouXianMing on 15/3/16.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.imageView        = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
    self.imageView.center = self.view.center;
    [self.view addSubview:self.imageView];
    
    
    [self generateCode];
}

- (UIImage *)resizeImage:(UIImage *)image
             withQuality:(CGInterpolationQuality)quality
                    rate:(CGFloat)rate {
    UIImage *resized = nil;
    CGFloat width    = image.size.width * rate;
    CGFloat height   = image.size.height * rate;
    
    UIGraphicsBeginImageContext(CGSizeMake(width, height));
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetInterpolationQuality(context, quality);
    [image drawInRect:CGRectMake(0, 0, width, height)];
    resized = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return resized;
}

- (void)generateCode {
    
    // @"CICode128BarcodeGenerator"  条形码
    // @"CIAztecCodeGenerator"       二维码
    NSString *filtername = @"CICode128BarcodeGenerator";

    
    CIFilter *filter = [CIFilter filterWithName:filtername];
    [filter setDefaults];
    
    NSData *data = [@"YouXianMing" dataUsingEncoding:NSUTF8StringEncoding];
    [filter setValue:data forKey:@"inputMessage"];
    
    CIImage *outputImage = [filter outputImage];
    CIContext *context = [CIContext contextWithOptions:nil];
    CGImageRef cgImage = [context createCGImage:outputImage
                                       fromRect:[outputImage extent]];
    UIImage *image = [UIImage imageWithCGImage:cgImage
                                         scale:1.
                                   orientation:UIImageOrientationUp];
    
    // Resize without interpolating
    CGFloat scaleRate = self.imageView.frame.size.width / image.size.width;
    UIImage *resized = [self resizeImage:image
                             withQuality:kCGInterpolationNone
                                    rate:scaleRate];
    
    self.imageView.image = resized;
    
    CGImageRelease(cgImage);
}

@end