关于二维码的生成，系统提供了API。
第一步根据内容生成CIImage
//根据url 创建CIImage
+(CIImage *)QRFromUrl:(NSString *)urlStr{
// 1、创建滤镜对象
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
// 恢复滤镜的默认属性
[filter setDefaults];
// 2、设置数据
NSString *info = urlStr;
// 将字符串转换成
NSData *infoData = [info dataUsingEncoding:NSUTF8StringEncoding];
// 通过KVC设置滤镜inputMessage数据
[filter setValue:infoData forKeyPath:@"inputMessage"];
// 3、获得滤镜输出的图像
CIImage *outputImage = [filter outputImage];
return outputImage;
}
第二步根据CIImage生成UIImage
/** 根据CIImage生成指定大小的UIImage */
+ (UIImage *)createUIImageFormCIImage:(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];
}
这样就可以生成简单的二维码。
普通的二维码.png
如果要在二维码中间加一个logo头像，我们需要给生成的二维码添加水印。
假定已经生成了普通的二维码
第一步:需要根据二维码图片设置生成水印图片rect：
//根据二维码图片设置生成水印图片rect 这里限制水印的图片为二维码的1/4
CGRect waterImageRect = [self getWaterImageRectFromOutputQRImage:orginQRImage];
+(CGRect)getWaterImageRectFromOutputQRImage:(UIImage *)orginQRImage{
CGSize linkSize = CGSizeMake(orginQRImage.size.width / 4, orginQRImage.size.height / 4);
CGFloat linkX = (orginQRImage.size.width -linkSize.width)/2;
CGFloat linkY = (orginQRImage.size.height -linkSize.height)/2;
return CGRectMake(linkX, linkY, linkSize.width, linkSize.height);
}
第二步：根据限制的rect重新生成logo图片
UIImage *logoImage =[[UIImage imageNamed:logoName]scaleToSize:waterImageRect.size];
-(UIImage*)scaleToSize:(CGSize)size
{
size = CGSizeMake(size.width , size.height );
// 创建一个bitmap的context
// 并把它设置成为当前正在使用的context
UIGraphicsBeginImageContext(size);
// 绘制改变大小的图片
[self drawInRect:CGRectMake(0, 0, size.width , size.height )];
// 从当前context中创建一个改变大小后的图片
UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
// 使当前的context出堆栈
UIGraphicsEndImageContext();
// 返回新的改变大小后的图片
return scaledImage;
}
第三步：为生成的二维码添加水印图片
//添加水印图片
finalImage =[UIImage LX_WaterImageWithImage:orginQRImage waterImage:waterImage waterImageRect:waterImageRect];
//添加水印图片
+ (UIImage *)LX_WaterImageWithImage:(UIImage *)image waterImage:(UIImage *)waterImage waterImageRect:(CGRect)rect{
//1.获取图片
//2.开启上下文
UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
//3.绘制背景图片
[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
//绘制水印图片到当前上下文
[waterImage drawInRect:rect];
//4.从上下文中获取新图片
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
//5.关闭图形上下文
UIGraphicsEndImageContext();
//返回图片
return newImage;
}
最后会生成如下的二维码
logo二维码.png
把方法封装在 分类里面,直接调用即可。
//普通的二维码
+(UIImage *)LX_ImageOfQRFromURL:(NSString *)urlStr codeSize:(CGFloat)codeSize;
//带logo 的二维码
+(UIImage *)LX_ImageOfQRFromURL:(NSString *)urlStr codeSize:(CGFloat)codeSize logoName:(NSString *)logoName radius: (CGFloat)radius borderWidth:(CGFloat)borderWidth borderColor:(UIColor *)borderColor;
简单介绍一些图片裁剪处理的分类。
1、裁剪图片自定义圆角
+ (UIImage *)LX_ClipImageWithImage:(UIImage *)image circleRect:(CGRect)rect radious:(CGFloat) radious;
+ (UIImage *)LX_ClipImageWithImage:(UIImage *)image circleRect:(CGRect)rect radious:(CGFloat) radious{
//1、开启上下文
UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
//2、设置裁剪区域
// UIBezierPath * path = [UIBezierPath bezierPathWithOvalInRect:rect];
UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radious];
[path addClip];
//3、绘制图片
[image drawAtPoint:CGPointZero];
//4、获取新图片
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
//5、关闭上下文
UIGraphicsEndImageContext();
//6、返回新图片
return newImage;
}
圆形裁剪.png
2、圆形裁剪带边框
//裁剪带边框的圆形图片
+ ( UIImage *)LX_ClipCircleImageWithImage:(UIImage *)image circleRect:(CGRect)rect borderWidth:(CGFloat)borderW borderColor:( UIColor *)borderColor;
//裁剪带边框的圆形图片
+ (UIImage *)LX_ClipCircleImageWithImage:(UIImage *)image circleRect:(CGRect)rect borderWidth:(CGFloat)borderW borderColor:( UIColor *)borderColor{
//1、开启上下文
UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
//2、设置边框
UIBezierPath * path = [UIBezierPath bezierPathWithOvalInRect:rect];
[borderColor setFill];
[path fill];
//3、设置裁剪区域
UIBezierPath * clipPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(rect.origin.x + borderW , rect.origin.x + borderW , rect.size.width - borderW * 2, rect.size.height - borderW *2)];
[clipPath addClip];
//3、绘制图片
[image drawAtPoint:CGPointZero];
//4、获取新图片
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
//5、关闭上下文
UIGraphicsEndImageContext();
//6、返回新图片
return newImage;
}
圆形裁剪边框.png
3、自定义图片圆角
//裁剪图片自定义圆角
+ (UIImage *)LX_ClipImageWithImage:(UIImage *)image circleRect:(CGRect)rect radious:(CGFloat) radious;
+ (UIImage *)LX_ClipImageWithImage:(UIImage *)image circleRect:(CGRect)rect radious:(CGFloat) radious{
//1、开启上下文
UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
//2、设置裁剪区域
// UIBezierPath * path = [UIBezierPath bezierPathWithOvalInRect:rect];
UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radious];
[path addClip];
//3、绘制图片
[image drawAtPoint:CGPointZero];
//4、获取新图片
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
//5、关闭上下文
UIGraphicsEndImageContext();
//6、返回新图片
return newImage;
}
自定义图片裁剪圆角.png
4、自定义图片边框圆角
//裁剪带边框的图片 可设置圆角 边框颜色
+(UIImage *)LX_ClipImageRadiousWithImage:(UIImage *)image circleRect:(CGRect)rect radious:(CGFloat)radious borderWith:(CGFloat)borderW borderColor:( UIColor *)borderColor;
//裁剪带边框的图片 可设置圆角 边框颜色
+(UIImage *)LX_ClipImageRadiousWithImage:(UIImage *)image circleRect:(CGRect)rect radious:(CGFloat)radious borderWith:(CGFloat)borderW borderColor:( UIColor *)borderColor{
//1、开启上下文
UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
//2、设置边框
UIBezierPath *path =[UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radious];
[borderColor setFill];
[path fill];
//3、设置裁剪区域
UIBezierPath * clipPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(rect.origin.x + borderW , rect.origin.x + borderW , rect.size.width - borderW * 2, rect.size.height - borderW *2) cornerRadius:radious];
[clipPath addClip];
//3、绘制图片
[image drawAtPoint:CGPointZero];
//4、获取新图片
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
//5、关闭上下文
UIGraphicsEndImageContext();
//6、返回新图片
return newImage;
}
自定义图片边框圆角.png
5、图片添加水印
//添加水印图片
+ (UIImage *)LX_WaterImageWithImage:(UIImage *)image waterImage:(UIImage *)waterImage waterImageRect:(CGRect)rect;
//添加水印图片
+ (UIImage *)LX_WaterImageWithImage:(UIImage *)image waterImage:(UIImage *)waterImage waterImageRect:(CGRect)rect{
//1.获取图片
//2.开启上下文
UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
//3.绘制背景图片
[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
//绘制水印图片到当前上下文
[waterImage drawInRect:rect];
//4.从上下文中获取新图片
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
//5.关闭图形上下文
UIGraphicsEndImageContext();
//返回图片
return newImage;
}
图片添加水印.png
demo 里简单封装了下。效果图
二维码.gif
最后说明一下访问相册以及识别二维码进行跳转页面。这一块必须用真机测试。
关于二维码扫描使用SGQRCode,
相册选择选择TZImagePickerController
替换掉博主的选择相册。
TZImagePickerController *pickerController = [[TZImagePickerController alloc]initWithMaxImagesCount:1 delegate:self];
NCWS(weakSelf);
[pickerController setDidFinishPickingPhotosHandle:^(NSArray<UIImage *> *photo, NSArray *assets, BOOL isSelectOriginalPhoto){
NSLog(@"%@",photo);
UIImage *image = photo[0];
// CIDetector(CIDetector可用于人脸识别)进行图片解析，从而使我们可以便捷的从相册中获取到二维码
// 声明一个 CIDetector，并设定识别类型 CIDetectorTypeQRCode
CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{CIDetectorAccuracy: CIDetectorAccuracyHigh}];
// 取得识别结果
NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];
if (features.count == 0) {
}else{
for (int index = 0; index < [features count]; index ++) {
CIQRCodeFeature *feature = [features objectAtIndex:index];
NSString *resultStr = feature.messageString;
weakSelf.detectorString = resultStr;
}
NSString *result = weakSelf.detectorString;
if ([result hasPrefix:@"http"]) {
ScanSuccessJumpVC *jumpVC = [[ScanSuccessJumpVC alloc] init];
jumpVC.jump_URL = result;
[self.navigationController pushViewController:jumpVC animated:YES];
} else {
ScanSuccessJumpVC *jumpVC = [[ScanSuccessJumpVC alloc] init];
jumpVC.jump_bar_code = result;
[self.navigationController pushViewController:jumpVC animated:YES];
}
}
}];
[self presentViewController:pickerController animated:YES completion:nil];
demo地址:二维码制作与图片处理
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