生成二维码

-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event

{

// 1.创建滤镜

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

// 2.清空滤镜(还原默认设置,因为滤镜有可能保存上一次的设置)

[filtersetDefaults];

// 3.创建二维码需要保存的数据

NSData*data = [@"IOS开发很牛逼"dataUsingEncoding:NSUTF8StringEncoding];

// 4.设置数据(KVC)

[filtersetValue:dataforKey:@"inputMessage"];

// 5.生成二维码,获取生成后的二维码图片

CIImage*image = [filteroutputImage];

self.QRCImage.image= [selfcreateNonInterpolatedUIImageFormCIImage:imagewithSize:400];

}

/**

*根据CIImage生成指定大小的UIImage

*

*@paramimage CIImage

*@paramsize图片宽度

*/

- (UIImage*)createNonInterpolatedUIImageFormCIImage:(CIImage*)image withSize:(CGFloat) size

{

CGRectextent =CGRectIntegral(image.extent);

CGFloatscale =MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));

// 1.创建bitmap;

size_twidth =CGRectGetWidth(extent) * scale;

size_theight =CGRectGetHeight(extent) * scale;

CGColorSpaceRefcs =CGColorSpaceCreateDeviceGray();

CGContextRefbitmapRef =CGBitmapContextCreate(nil, width, height,8,0, cs, (CGBitmapInfo)kCGImageAlphaNone);

CIContext*context = [CIContextcontextWithOptions:nil];

CGImageRefbitmapImage = [contextcreateCGImage:imagefromRect:extent];

CGContextSetInterpolationQuality(bitmapRef,kCGInterpolationNone);

CGContextScaleCTM(bitmapRef, scale, scale);

CGContextDrawImage(bitmapRef, extent, bitmapImage);

// 2.保存bitmap到图片

CGImageRefscaledImage =CGBitmapContextCreateImage(bitmapRef);

CGContextRelease(bitmapRef);

CGImageRelease(bitmapImage);

return[UIImageimageWithCGImage:scaledImage];

}

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