http://www.cnblogs.com/gchlcc/p/5585482.html
導(dǎo)入<CoreImage/CoreImage.h>
-(void)creatQRcode:(NSString *)url
{
// 1.創(chuàng)建過濾器 -- 蘋果沒有將這個(gè)字符封裝成常量
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
// 2.過濾器恢復(fù)默認(rèn)設(shè)置
[filter setDefaults];
// 3.給過濾器添加數(shù)據(jù)(正則表達(dá)式/帳號(hào)和密碼) -- 通過KVC設(shè)置過濾器,只能設(shè)置NSData類型
NSData *data = [url dataUsingEncoding:NSUTF8StringEncoding];
[filter setValue:data forKeyPath:@"inputMessage"];
// 4.獲取輸出的二維碼
CIImage *outputImage = [filter outputImage];
//? ? self.tgImageView.image=[UIImage imageWithCIImage:outputImage];
UIImage *image=[self createNonInterpolatedUIImageFormCIImage:outputImage withSize:100];
self.tgImageView.image=image;
}
//處理二維碼
- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size
{
CGRect extent = CGRectIntegral(image.extent);
CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
// 1.創(chuàng)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到圖片
CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
CGContextRelease(bitmapRef);
CGImageRelease(bitmapImage);
return [UIImage imageWithCGImage:scaledImage];
}
