ios/Timi/Class/Base/Utils/CodeHandler/CodeHandlerObject.m

//
//  CodeHandlerObject.m
//  MIT_Endorsement
//
//  Created by 翟玉磊 on 2017/10/13.
//  Copyright © 2017年 翟玉磊. All rights reserved.
//

#import "CodeHandlerObject.h"

@implementation CodeHandlerObject

+ (UIImage *)createCodeWithUrl:(NSString *)url withSize:(CGFloat)size {
    // 1. 实例化二维码滤镜
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    // 2. 恢复滤镜的默认属性
    [filter setDefaults];
    
    // 3. 将字符串转换成NSData
//    NSString *urlStr = @"http://www.ychpay.com/down.html";//测试二维码地址,次二维码不能支付,需要配合服务器来二维码的地址(跟后台人员配合)
    NSData *data = [url dataUsingEncoding:NSUTF8StringEncoding];
    // 4. 通过KVO设置滤镜inputMessage数据
    [filter setValue:data forKey:@"inputMessage"];
    
    // 5. 获得滤镜输出的图像
    CIImage *outputImage = [filter outputImage];
    
    // 6. 将CIImage转换成UIImage，并放大显示 (此时获取到的二维码比较模糊,所以需要用下面的createNonInterpolatedUIImageFormCIImage方法重绘二维码)
//    UIImage *codeImage = [UIImage imageWithCIImage:outputImage scale:1.0 orientation:UIImageOrientationUp];
    
    UIImage *codeImage = [CodeHandlerObject createNonInterpolatedUIImageFormCIImage:outputImage withSize:size]; //重绘二维码,使其显示清晰
    
    
    return codeImage;
}

/**
 * 根据CIImage生成指定大小的UIImage
 *
 * @param image CIImage
 * @param size 图片宽度
 */
+ (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat)size
{
    CGRect extent = CGRectIntegral(image.extent);
    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
    // 1.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);
    // 2.保存bitmap到图片
    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
    CGContextRelease(bitmapRef);
    CGImageRelease(bitmapImage);
    return [UIImage imageWithCGImage:scaledImage];
}

+ (UIImage *)codeImageAddLogoWithCodeImage:(UIImage *)codeImage withLogo:(UIImage *)logoImage {
    CGSize size = CGSizeMake(codeImage.size.width,codeImage.size.width);
    CGFloat logoWith = 40;
    
    UIGraphicsBeginImageContextWithOptions(size,NO,[UIScreen mainScreen].scale);//初始化画布
    
    [codeImage drawAtPoint:CGPointZero];//把条形码图片添加到画布中
    
    CGContextRef context = UIGraphicsGetCurrentContext();//画布上下文
    
    CGContextDrawPath(context,kCGPathStroke);
    
    [codeImage drawInRect:CGRectMake(0,0,size.width,size.width)];
    
    [logoImage drawInRect:CGRectMake((size.width - logoWith) / 2,(size.height - logoWith) / 2, logoWith, logoWith)];
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); //将画布映射到图片对象
    
    UIGraphicsEndImageContext();//关闭画布
    
    return image;
}


//生成的图片
+ (UIImage *)snapshotViewFromRect:(CGRect)rect withCapInsets:(UIEdgeInsets)capInsets layer:(CALayer *)theLayer{
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, [UIScreen mainScreen].scale);
    CGContextRef currentContext = UIGraphicsGetCurrentContext();
    [theLayer renderInContext:currentContext];
    
    UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return snapshotImage;
}


//生成带圆角的logo，logo不带边框。
+ (UIImage *)createQRCodeImageWithString:(NSString *)url centerLogo:(UIImage *)centerLogo logoType:(QRCodeLogoType)logoType withSize:(CGFloat)imageWH {
    //        NSLog(@"%@", filter);
    // 二维码过滤器
    CIFilter *filterImage = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    // 将二位码过滤器设置为默认属性
    [filterImage setDefaults];
    // 将文字转化为二进制
    NSData *dataImage = [url dataUsingEncoding:NSUTF8StringEncoding];
    // 打印输入的属性
    //        NSLog(@"%@", filterImage.inputKeys);
    // KVC 赋值
    [filterImage setValue:dataImage forKey:@"inputMessage"];
    // 取出输出图片
    CIImage *outputImage = [filterImage outputImage];
    outputImage = [outputImage imageByApplyingTransform:CGAffineTransformMakeScale(20, 20)];
    // 转化图片
    UIImage *image = [UIImage imageWithCIImage:outputImage];
    
    if (image == nil) {
        return nil;
    }
    //生成图片，并获取上下文，得到一个带头像的二维码图片
    image = [self createNewImage:image logoImage:centerLogo logoType:logoType withSize:imageWH];
    
    return image;
}

+ (UIImage *)createNewImage:(UIImage *)theImage logoImage:(UIImage *)logoImage logoType:(QRCodeLogoType)logoType withSize:(CGFloat)imageWH {
    float width = imageWH;
    float height = imageWH;
    UIView *view  = [[UIView alloc]initWithFrame:CGRectMake(0, 0, width,height)];
    view.backgroundColor = [UIColor whiteColor];
    
    UIImageView *bacImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, width,height)];
    bacImageView.image = theImage;
    bacImageView.backgroundColor = [UIColor whiteColor];
    [view addSubview:bacImageView];
    
    //logoImage.size.width;
    if (logoImage) {
        float width_logo = width / 5;   //logo太大识别不了二维码
        UIView *logoBacView  = [[UIView alloc]initWithFrame:CGRectMake((width - width_logo)/2 , (height - width_logo)/2, width_logo + 10,width_logo + 10)];
        logoBacView.backgroundColor = [UIColor whiteColor];
        logoBacView.layer.masksToBounds = YES;
        [bacImageView addSubview:logoBacView];
        
        UIImageView *centerImgView = [[UIImageView alloc]initWithFrame:CGRectMake(5,5, width_logo,width_logo)];
        centerImgView.image = logoImage;
        centerImgView.layer.masksToBounds = YES;
        centerImgView.backgroundColor = [UIColor whiteColor];
        [logoBacView addSubview:centerImgView];
        
        //设置圆角
        float radius = 0;
        float radius_img = 0;
        if (logoType == QRCodeLogoType_Round) {
            radius = (width_logo + 10)/2;
            radius_img = width_logo/2;
        }else if (logoType == QRCodeLogoType_Radius){
            radius = 6;
            radius_img = 6;
        }else {
            radius = 0;
            radius_img = 0;
        }
        logoBacView.layer.cornerRadius = radius;
        centerImgView.layer.cornerRadius = radius_img;
    }
    
    
    //生成图片
    UIImage *img = [self snapshotViewFromRect:CGRectMake(0, 0, view.frame.size.width, view.frame.size.height) withCapInsets:UIEdgeInsetsZero layer:view.layer];
    
    return img;
}

/*
 生成条形码
 @param source
 @return 生成条形码的CIImage对象
 */
+ (CIImage *)generateBarCodeImage:(NSString *)source {
    // iOS 8.0以上的系统才支持条形码的生成，iOS8.0以下使用第三方控件生成
    if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) {
        // 注意生成条形码的编码方式
        NSData *data = [source dataUsingEncoding: NSASCIIStringEncoding];
        CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];
        [filter setValue:data forKey:@"inputMessage"];
        // 设置生成的条形码的上，下，左，右的margins的值
        [filter setValue:[NSNumber numberWithInteger:0] forKey:@"inputQuietSpace"];
        return filter.outputImage;
    }else{
        return nil;
    }
}

/**
 
 调整生成的图片的大小
 @param image CIImage对象
 @param size 需要的UIImage的大小
 @return size大小的UIImage对象
 */
+ (UIImage *) resizeCodeImage:(CIImage *)image withSize:(CGSize)size {
    if (image) {
        CGRect extent = CGRectIntegral(image.extent);
        CGFloat scaleWidth = size.width/CGRectGetWidth(extent);
        CGFloat scaleHeight = size.height/CGRectGetHeight(extent);
        size_t width = CGRectGetWidth(extent) * scaleWidth;
        size_t height = CGRectGetHeight(extent) * scaleHeight;
        CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray();
        CGContextRef contentRef = CGBitmapContextCreate(nil, width, height, 8, 0, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaNone);
        CIContext *context = [CIContext contextWithOptions:nil];
        CGImageRef imageRef = [context createCGImage:image fromRect:extent];
        CGContextSetInterpolationQuality(contentRef, kCGInterpolationNone);
        CGContextScaleCTM(contentRef, scaleWidth, scaleHeight);
        CGContextDrawImage(contentRef, extent, imageRef);
        CGImageRef imageRefResized = CGBitmapContextCreateImage(contentRef);
        CGContextRelease(contentRef);
        CGImageRelease(imageRef);
        return [UIImage imageWithCGImage:imageRefResized];
    }else{
        return nil;
    }
}
@end