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iOS 生成二维码的两种方式

iOS 生成二维码的两种方式

作者: 草原烈鹰 | 来源:发表于2017-01-13 15:25 被阅读106次

    生成二维码的两种方式:一种是利用第三方生成,一种是自己自定义生成。
    1.用的第三方是:QRCode, 使用前先下载第三方。

    关于第三方和自定义,直接上代码:

    
    #import "ViewController.h"
    #import "WGJViewController.h"
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        // Do any additional setup after loading the view, typically from a nib.
        UIButton *btn = [UIButton buttonWithType:(UIButtonTypeCustom)];
        [btn addTarget:self action:@selector(clickPush) forControlEvents:(UIControlEventTouchUpInside)];
        [btn setImage:[UIImage imageNamed:@"test01"] forState:(UIControlStateNormal)];
        btn.backgroundColor = [UIColor redColor];
        //    btn.enabled = NO;
        //    btn.userInteractionEnabled = NO;
        btn.frame = CGRectMake(100, 100, 100, 40);
        [self.view addSubview:btn];
    
    }
    
    - (void)clickPush
    {
        WGJViewController *tee = [[WGJViewController alloc] init];
        [self.navigationController pushViewController:tee animated:YES];
    }
    @end
    
    
    
    #import "WGJViewController.h"
    #import "UIImage+MDQRCode.h"
    #import "UIImageView+WProductCode.h"
    
    @interface WGJViewController ()
    
    @property (nonatomic, strong) UIImageView *imgView;
    @end
    
    @implementation WGJViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        
        self.view.backgroundColor = [UIColor whiteColor];
        
        // Do any additional setup after loading the view.
        UIView *vWhiteView = [[UIView alloc] initWithFrame:CGRectMake(100 , 100,  136 , 250)];
        vWhiteView.layer.cornerRadius = 2;
        vWhiteView.backgroundColor = [UIColor whiteColor];
        [self.view addSubview:vWhiteView];
        
        //二维码---1----
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(18 ,18 , CGRectGetWidth(vWhiteView.frame)-36 ,CGRectGetWidth(vWhiteView.frame)-36)];
        
        [vWhiteView addSubview:imageView];
        imageView.backgroundColor = [UIColor whiteColor];
        imageView.image = [UIImage mdQRCodeForString:[NSString stringWithFormat:@"%@",@"12312"] size:imageView.bounds.size.width fillColor:[UIColor blackColor]];
        
        //二维码---2------
        self.imgView=[[UIImageView alloc]initWithFrame:CGRectMake(100, 350, 200, 200)];
        
        [UIImageView productCodeWithImageView:self.imgView codeStr:@"12121"];
        
        [self.view addSubview:_imgView];
        
    //    [self erweimaWithSize:_imgView.bounds.size.width codeStr:@"1212"];
        
    }
    @end
    
    
    自定义的分类:
    
    \#import <UIKit/UIKit.h>
    
    @interface UIImageView (WProductCode)
    //二维码
    + (void)productCodeWithImageView:(UIImageView *)imageV codeStr:(NSString *)codeStr;
    @end
    
    
    \#import "UIImageView+WProductCode.h"
    
    @implementation UIImageView (WProductCode)
    //二维码
    + (void)productCodeWithImageView:(UIImageView *)imageV codeStr:(NSString *)codeStr
    
    {
        
        //二维码滤镜
        
        CIFilter *filter=[CIFilter filterWithName:@"CIQRCodeGenerator"];
        
        //恢复滤镜的默认属性
        
        [filter setDefaults];
        
        //将字符串转换成NSData
        
        NSData *data=[codeStr dataUsingEncoding:NSUTF8StringEncoding];
        
        //通过KVO设置滤镜inputmessage数据
        
        [filter setValue:data forKey:@"inputMessage"];
        
        //获得滤镜输出的图像
        
        CIImage *outputImage=[filter outputImage];
        
        //将CIImage转换成UIImage,并放大显示
        
        imageV.image=[self createNonInterpolatedUIImageFormCIImage:outputImage withSize:imageV.bounds.size.width];
        
        
        //如果还想加上阴影,就在ImageView的Layer上使用下面代码添加阴影
        
        imageV.layer.shadowOffset=CGSizeMake(0, 0.5);//设置阴影的偏移量
        
        imageV.layer.shadowRadius=1;//设置阴影的半径
        
        imageV.layer.shadowColor=[UIColor blackColor].CGColor;//设置阴影的颜色为黑色
        
        imageV.layer.shadowOpacity=0.3;
        
        
        
    }
    
    + (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {
        
        CGRect extent = CGRectIntegral(image.extent);
        
        CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
        
        // 创建bitmap;
        
        size_t width = CGRectGetWidth(extent) * scale;
        
        size_t height = CGRectGetHeight(extent) * scale;
        
        CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
        
        CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
        
        CIContext *context = [CIContext contextWithOptions:nil];
        
        CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
        
        CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
        
        CGContextScaleCTM(bitmapRef, scale, scale);
        
        CGContextDrawImage(bitmapRef, extent, bitmapImage);
        
        // 保存bitmap到图片
        
        CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
        
        CGContextRelease(bitmapRef);
        
        CGImageRelease(bitmapImage);
        
        return [UIImage imageWithCGImage:scaledImage];
        
    }
    
    @end
    
    

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