生成二维码
self.QRcodeimg.image = [self createQRImageWithString:@"http://www.pengchao.vip" size:self.QRcodeimg.frame.size];
self.QRcodeimg.image = [self addImageForQRImage:self.QRcodeimg.image];
//生成制定大小的黑白二维码
- (UIImage*)createQRImageWithString:(NSString*)string size:(CGSize)size
{
NSData *stringData = [string dataUsingEncoding:NSUTF8StringEncoding];
CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
[qrFiltersetValue:stringDataforKey:@"inputMessage"];
[qrFiltersetValue:@"M" forKey:@"inputCorrectionLevel"];
CIImage*qrImage = qrFilter.outputImage;
//放大并绘制二维码（上面生成的二维码很小，需要放大）
CGImageRef cgImage = [[CIContext contextWithOptions:nil] createCGImage:qrImage fromRect:qrImage.extent];
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetInterpolationQuality(context, kCGInterpolationNone);
//翻转一下图片 不然生成的QRCode就是上下颠倒的
CGContextScaleCTM(context,1.0, -1.0);
CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);
UIImage *codeImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndPDFContext();
CGImageRelease(cgImage);
returncodeImage;
}
//在二维码中心加一个小图
- (UIImage*)addImageForQRImage:(UIImage*)qrImage
{
UIGraphicsBeginImageContext(qrImage.size);
[qrImagedrawInRect:CGRectMake(0,0, qrImage.size.width, qrImage.size.height)];
UIImage *image = [UIImage imageNamed:@"xiaoxi_icon_QQ"];
CGFloatimageW =50;
CGFloatimaegX = (qrImage.size.width- imageW) *0.5;
CGFloatimageY = (qrImage.size.height- imageW) *0.5;
[imagedrawInRect:CGRectMake(imaegX, imageY, imageW, imageW)];
UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnresult;
}