前一段時(shí)間做了一個(gè)關(guān)于跑腿的App,有一個(gè)需求就是后臺給每一個(gè)用戶一個(gè)唯一的鏈接屈扎，這個(gè)鏈接邀請好友注冊獲得獎勵红符。在App上以二維碼的方式展示枷畏，現(xiàn)在給出我的二維碼生成的方式和代碼

1.主要是中間帶圖片的二維碼

/**
 生成二維碼

 @param url 二維碼的URL
 @param View 添加到哪一個(gè)View上面
 */
- (void)setErWeiMaWithUrl:(NSString *)url AndView:(UIView *)View{
    // 1勇劣、創(chuàng)建濾鏡對象
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    // 恢復(fù)濾鏡的默認(rèn)屬性
    [filter setDefaults];
    // 2堕战、設(shè)置數(shù)據(jù)
    NSString *string_data = url;
    // 將字符串轉(zhuǎn)換成 NSdata (雖然二維碼本質(zhì)上是字符串, 但是這里需要轉(zhuǎn)換, 不轉(zhuǎn)換就崩潰)
    NSData *qrImageData = [string_data dataUsingEncoding:NSUTF8StringEncoding];
    
    // 設(shè)置過濾器的輸入值, KVC賦值
    [filter setValue:qrImageData forKey:@"inputMessage"];
    
    // 3补君、獲得濾鏡輸出的圖像
    CIImage *outputImage = [filter outputImage];
    // 圖片小于(27,27),我們需要放大
    outputImage = [outputImage imageByApplyingTransform:CGAffineTransformMakeScale(20, 20)];
    // 4引几、將CIImage類型轉(zhuǎn)成UIImage類型
    UIImage *start_image = [UIImage imageWithCIImage:outputImage];

    // - - - - - - - - - - - - - - - - 添加中間小圖標(biāo) - - - - - - - - - - - - - - - -
    // 5、開啟繪圖, 獲取圖形上下文 (上下文的大小, 就是二維碼的大小)
    UIGraphicsBeginImageContext(start_image.size);
    // 把二維碼圖片畫上去 (這里是以圖形上下文, 左上角為(0,0)點(diǎn)
    [start_image drawInRect:CGRectMake(0, 0, start_image.size.width, start_image.size.height)];
    // 再把小圖片畫上去
    NSString *icon_imageName = @"icon_image";
    UIImage *icon_image = [UIImage imageNamed:icon_imageName];
    CGFloat icon_imageW = 200;
    CGFloat icon_imageH = icon_imageW;
    CGFloat icon_imageX = (start_image.size.width - icon_imageW) * 0.5;
    CGFloat icon_imageY = (start_image.size.height - icon_imageH) * 0.5;
    [icon_image drawInRect:CGRectMake(icon_imageX, icon_imageY, icon_imageW, icon_imageH)];
    // 6挽铁、獲取當(dāng)前畫得的這張圖片
    UIImage *final_image = UIGraphicsGetImageFromCurrentImageContext();
    // 7伟桅、關(guān)閉圖形上下文
    UIGraphicsEndImageContext();
    // 8、借助UIImageView顯示二維碼
    UIImageView *imageView = [[UIImageView alloc] init];
    CGFloat imageViewW = 110;
    CGFloat imageViewH = imageViewW;
    CGFloat imageViewX = 0;
    CGFloat imageViewY = 0;
    imageView.frame =CGRectMake(imageViewX, imageViewY, imageViewW, imageViewH);
    [View addSubview:imageView];
    // 9叽掘、將最終合得的圖片顯示在UIImageView上
    imageView.image = final_image;
}

2.不帶小圖片的二維碼

// 生成二維碼
- (void)setupGenerateQRCode {
    
    // 1楣铁、創(chuàng)建濾鏡對象
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    
    // 恢復(fù)濾鏡的默認(rèn)屬性
    [filter setDefaults];
    
    // 2、設(shè)置數(shù)據(jù)
    NSString *info = @"https://github.com/kingsic";
    // 將字符串轉(zhuǎn)換成
    NSData *infoData = [info dataUsingEncoding:NSUTF8StringEncoding];
    
    // 通過KVC設(shè)置濾鏡inputMessage數(shù)據(jù)
    [filter setValue:infoData forKeyPath:@"inputMessage"];
    
    // 3更扁、獲得濾鏡輸出的圖像
    CIImage *outputImage = [filter outputImage];
    
    // 4盖腕、借助UIImageView顯示二維碼
    UIImageView *imageView = [[UIImageView alloc] init];
    CGFloat imageViewW = 150;
    CGFloat imageViewH = imageViewW;
    CGFloat imageViewX = (self.view.frame.size.width - imageViewW) / 2;
    CGFloat imageViewY = 80;
    imageView.frame =CGRectMake(imageViewX, imageViewY, imageViewW, imageViewH);
    [self.view addSubview:imageView];
    
    // 5赫冬、將CIImage轉(zhuǎn)換成UIImage，并放大顯示
    imageView.image = [outputImage SG_createNonInterpolatedWithSize:imageViewW];
}

demo還有設(shè)計(jì)掃描溃列，有興趣的可以看一下
原文地址http://www.cocoachina.com/ios/20161009/17696.html
GitHub下載地址: https://github.com/kingsic/SGQRCode.git