加入QrCodeImage.h QrCodeImage.m 到工程中。
//
// 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
//
// 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。。。
/**
* 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, BOOL * _Nonnull stop) {
CIQRCodeFeature *temp = (CIQRCodeFeature *)obj;
[str appendFormat:@"地址:%@",temp.messageString];
}];
self.msglabel.text = str;
}
