黑白二維碼

//黑白二維碼生成
-(void)demo1{
    //CoreImage包含在UIKit框架中
    //獲取內(nèi)置的所有過濾器
    NSArray *filters = [CIFilter filterNamesInCategory:kCICategoryBuiltIn];
    NSLog(@"%@",filters);
    //1.創(chuàng)建二維碼過濾器
    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    //2.設(shè)置默認值
    [qrFilter setDefaults];
    //3.打印輸入的key
    NSLog(@"%@",qrFilter.inputKeys);
    /*
     inputMessage, 二維碼信息
     inputCorrectionLevel 容錯水平
     */
    
    //4.設(shè)置二維碼的信息
    
    [qrFilter setValue:[@"無聊" dataUsingEncoding:NSUTF8StringEncoding] forKey:@"inputMessage"];
    //5.輸出二維碼圖片
    CIImage *ciImage = qrFilter.outputImage;
    NSLog(@"%@",ciImage);
    ciImage = [ciImage imageByApplyingTransform:CGAffineTransformMakeScale(10, 10)];
    self.imageView.image = [UIImage imageWithCIImage:ciImage];
}

彩色二維碼

//彩色二維碼
-(void)demo2{
    //CoreImage包含在UIKit框架中
    //獲取內(nèi)置的所有過濾器
    NSArray *filters = [CIFilter filterNamesInCategory:kCICategoryBuiltIn];
    NSLog(@"%@",filters);
    //1.創(chuàng)建二維碼過濾器
    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    //2.設(shè)置默認值
    [qrFilter setDefaults];
    //3.打印輸入的key
    NSLog(@"%@",qrFilter.inputKeys);
    /*
     inputMessage, 二維碼信息
     inputCorrectionLevel 容錯水平
     */
    
    //4.設(shè)置二維碼的信息
    
    [qrFilter setValue:[@"無聊" dataUsingEncoding:NSUTF8StringEncoding] forKey:@"inputMessage"];
    //5.輸出二維碼圖片
    CIImage *ciImage = qrFilter.outputImage;
    NSLog(@"%@",ciImage);
    //6.獲取顏色過濾器
    CIFilter *colorFilter = [CIFilter filterWithName:@"CIFalseColor"];
    //7.設(shè)置默認值
    [colorFilter setDefaults];
    NSLog(@"%@",colorFilter.inputKeys);
    /*
     inputImage 需要改變顏色的圖片
     inputColor0, 前景色
     inputColor1  背景色
     */
    [colorFilter setValue:ciImage forKey:@"inputImage"];
    [colorFilter setValue:[CIColor colorWithRed:1 green:0 blue:0] forKey:@"inputColor0"];
    [colorFilter setValue:[CIColor colorWithRed:0 green:1 blue:0] forKey:@"inputColor1"];
    ciImage = colorFilter.outputImage;
    
    ciImage = [ciImage imageByApplyingTransform:CGAffineTransformMakeScale(10, 10)];
    self.imageView.image = [UIImage imageWithCIImage:ciImage];

}

二維碼添加頭像

//二維碼添加頭像
-(void)demo3{
    //CoreImage包含在UIKit框架中
    //獲取內(nèi)置的所有過濾器
    NSArray *filters = [CIFilter filterNamesInCategory:kCICategoryBuiltIn];
    NSLog(@"%@",filters);
    //1.創(chuàng)建二維碼過濾器
    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    //2.設(shè)置默認值
    [qrFilter setDefaults];
    //3.打印輸入的key
    NSLog(@"%@",qrFilter.inputKeys);
    /*
     inputMessage, 二維碼信息
     inputCorrectionLevel 容錯水平
     */
    
    //4.設(shè)置二維碼的信息
    
    [qrFilter setValue:[@"無聊" dataUsingEncoding:NSUTF8StringEncoding] forKey:@"inputMessage"];
    //5.輸出二維碼圖片
    CIImage *ciImage = qrFilter.outputImage;
    NSLog(@"%@",ciImage);
    ciImage = [ciImage imageByApplyingTransform:CGAffineTransformMakeScale(10, 10)];
    //6.開啟圖形上下文
    UIImage *uiImage = [UIImage imageWithCIImage:ciImage];
    UIGraphicsBeginImageContext(uiImage.size);
    //7.畫二維碼圖片
    [uiImage drawInRect:CGRectMake(0, 0, uiImage.size.width, uiImage.size.height)];
    //8.畫自定義圖片
    UIImage *image = [UIImage imageNamed:@"picture"];
    CGFloat imageW = 100;
    CGFloat imageH = 100;
    CGFloat imageX = (uiImage.size.width - imageW) * 0.5;
    CGFloat imageY = (uiImage.size.height - imageH) * 0.5;
    [image drawInRect:CGRectMake(imageX, imageY, imageW, imageH)];
    //9.獲取當前上下文中圖片
    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
    //10.關(guān)閉圖形上下文
    UIGraphicsEndImageContext();
    
    self.imageView.image = finalImage;

}