生成.扫描,二维码。

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//

// QrCodeImage.h

// matchPlus

//

// Created by mnn on 16/4/14.

// Copyright © 2016年 mnn. All rights reserved.

//

#import <UIKit/UIKit.h>

#import <CoreImage/CoreImage.h>

@interface QrCodeImage : UIView

/**

* 生成带logo的二维码

* 二维码和logo都是正方形的

* @param urlString 二维码中的链接

* @param QRCodeCGRect 二维码的CGRect

* @param logoImage 二维码中的logo

* @param logoImageSize logo的大小

* @param cornerRadius logo的圆角值大小

*

* @return 生成的二维码

*/

+ (QrCodeImage *)creatQRCodeWithURLString:(NSString *)urlString superView:(UIView *)superView logoImage:(UIImage *)logoImage logoImageSize:(CGSize)logoImageSize logoImageWithCornerRadius:(CGFloat)cornerRadius;

/**

* 读取图片中的二维码

*

* @param image 图片

*

* @return 图片中的二维码数据集合 CIQRCodeFeature对象

*/

+ (NSArray *)readQRCodeFromImage:(UIImage *)image;

/**

* 截图

*

* @param view 需要截取的视图

*

* @return 截图 图片

*/

+ (UIImage *)screenShotFormView:(UIView *)view;

@end

[objc] view plain copy

//

// QrCodeImage.m

// matchPlus

//

// Created by mnn on 16/4/14.

// Copyright © 2016年 mnn. All rights reserved.

//

#import "QrCodeImage.h"

@implementation QrCodeImage

/**

* 生成带logo的二维码

* 二维码和logo都是正方形的

* @param urlString 二维码中的链接

* @param QRCodeCGRect 二维码的CGRect

* @param logoImage 二维码中的logo

* @param logoImageSize logo的大小

* @param cornerRadius logo的圆角值大小

*

* @return 生成的二维码

*/

+ (QrCodeImage *)creatQRCodeWithURLString:(NSString *)urlString superView:(UIView *)superView logoImage:(UIImage *)logoImage logoImageSize:(CGSize)logoImageSize logoImageWithCornerRadius:(CGFloat)cornerRadius{

// 先移除子视图

QrCodeImage *oldQRCodeView = [superView viewWithTag:123];

[oldQRCodeView removeFromSuperview];

QrCodeImage *QRCodeView = [[QrCodeImage alloc] init];

QRCodeView.tag = 123;

QRCodeView.frame = CGRectMake(0, 0, superView.frame.size.width, superView.frame.size.height);

CIImage *ciImage = [QRCodeView creatQRcodeWithUrlstring:urlString]; // 生成二维码

UIImage *qrImage = [QRCodeView changeImageSizeWithCIImage:ciImage andSize:superView.frame.size.width]; // 改变二维码的大小

if (logoImage != nil) {

if (cornerRadius < 0) {

cornerRadius = 0;

NSLog(@"cornerRadius 不能小于0");

}

qrImage = [QRCodeView addImageToSuperImage:qrImage withSubImage:[QRCodeView imageWithCornerRadius:cornerRadius image:logoImage] andSubImagePosition:CGRectMake((superView.frame.size.width - logoImageSize.width)/2, (superView.frame.size.height - logoImageSize.height)/2, logoImageSize.width, logoImageSize.height)]; // 增加logo

}

QRCodeView.layer.contents = (__bridge id)qrImage.CGImage;

[superView addSubview:QRCodeView];

return QRCodeView;

}

/**

* 根据字符串生成二维码 CIImage 对象

*

* @param urlString 需要生成二维码的字符串

*

* @return 生成的二维码

*/

- (CIImage *)creatQRcodeWithUrlstring:(NSString *)urlString{

// 1.实例化二维码滤镜

CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];

// 2.恢复滤镜的默认属性 (因为滤镜有可能保存上一次的属性)

[filter setDefaults];

// 3.将字符串转换成NSdata

NSData *data = [urlString dataUsingEncoding:NSUTF8StringEncoding];

// 4.通过KVO设置滤镜, 传入data, 将来滤镜就知道要通过传入的数据生成二维码

[filter setValue:data forKey:@"inputMessage"];

// 5.生成二维码

CIImage *outputImage = [filter outputImage];

return outputImage;

}

/**

* 改变图片大小 (正方形图片)

*

* @param ciImage 需要改变大小的CIImage 对象的图片

* @param size 图片大小 (正方形图片 只需要一个数)

*

* @return 生成的目标图片

*/

- (UIImage *)changeImageSizeWithCIImage:(CIImage *)ciImage andSize:(CGFloat)size{

CGRect extent = CGRectIntegral(ciImage.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:@{kCIContextUseSoftwareRenderer : @(YES)}];

CGImageRef bitmapImage = [context createCGImage:ciImage 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];

}

/**

* 图片增加水印

*

* @param superImage 需要增加水印的图片

* @param subImage 水印图片

* @param posRect 水印的位置 和 水印的大小

*

* @return 加水印后的新图片

*/

- (UIImage *)addImageToSuperImage:(UIImage *)superImage withSubImage:(UIImage *)subImage andSubImagePosition:(CGRect)posRect{

UIGraphicsBeginImageContext(superImage.size);

[superImage drawInRect:CGRectMake(0, 0, superImage.size.width, superImage.size.height)];

//四个参数为水印图片的位置

[subImage drawInRect:posRect];

UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return resultingImage;

}

/**

* 图片设置圆角

*

* @param cornerRadius 圆角值

* @param original 图片

*

* @return 圆角图片

*/

- (UIImage *)imageWithCornerRadius:(CGFloat)cornerRadius image:(UIImage *)image

{

CGRect frame = CGRectMake(0, 0, image.size.width, image.size.height);

UIGraphicsBeginImageContextWithOptions(image.size, NO, 1.0);

[[UIBezierPath bezierPathWithRoundedRect:frame

cornerRadius:cornerRadius] addClip];

// 画图

[image drawInRect:frame];

// 获取新的图片

UIImage *im = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return im;

}

#pragma mark - 读取图片中的二维码

/**

* 读取图片中的二维码

*

* @param image 图片

*

* @return 图片中的二维码数据集合 CIQRCodeFeature对象

*/

+ (NSArray *)readQRCodeFromImage:(UIImage *)image{

// 创建一个CIImage对象

CIImage *ciImage = [[CIImage alloc] initWithCGImage:image.CGImage options:nil];

CIContext *context = [CIContext contextWithOptions:@{kCIContextUseSoftwareRenderer : @(YES)}]; // 软件渲染

CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:context options:@{CIDetectorAccuracy : CIDetectorAccuracyHigh}];// 二维码识别

// 注意这里的CIDetectorTypeQRCode

NSArray *features = [detector featuresInImage:ciImage];

NSLog(@"features = %@",features); // 识别后的结果集

for (CIQRCodeFeature *feature in features) {

NSLog(@"msg = %@",feature.messageString); // 打印二维码中的信息

}

return features;

}

/**

* 截图

*

* @param view 需要截取的视图

*

* @return 截图 图片

*/

+ (UIImage *)screenShotFormView:(UIView *)view

{

UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, [UIScreen mainScreen].scale);

[view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;

}

/*

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

// Drawing code

}

*/

@end

在需要调用二维码的类加如下代码。。。

[objc] view plain copy

/**

* 生成二维码

* @param superview 放二维码的视图

* @param logoImage logo图片

* @param logoImageSize logo大小

*/

- (IBAction)btnClick:(id)sender {

[HGDQQRCodeView creatQRCodeWithURLString:@"http://www.baidu.com" superView:self.QRView logoImage:[UIImage imageNamed:@"logo"] logoImageSize:CGSizeMake(40, 40) logoImageWithCornerRadius:0];

}

/**

* 读取图片中的二维码

*

* @param sender sender description

*/

- (IBAction)readBtnClick:(id)sender {

// 截图

UIImage *im = [HGDQQRCodeView screenShotFormView:self.view];

// 读取图片中的二维码

NSArray *array = [HGDQQRCodeView readQRCodeFromImage:im];

// 显示二维码中的信息

NSMutableString *str = [[NSMutableString alloc] init];

[array enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOLBOOL * _Nonnull stop) {

CIQRCodeFeature *temp = (CIQRCodeFeature *)obj;

[str appendFormat:@"地址:%@",temp.messageString];

}];

self.msglabel.text = str;

}