廢話不多說(shuō) ?代碼說(shuō)話
這里的self.url直接更換為 你要生成二維碼的url即可
- (void)setUpQrCodeImage{
// 1. 實(shí)例化二維碼濾鏡
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
// 2. 恢復(fù)濾鏡的默認(rèn)屬性
[filter setDefaults];
// 3. 將字符串轉(zhuǎn)換成NSData
NSString *urlStr = self.url;// 分享的二維碼
NSData *data = [urlStr dataUsingEncoding:NSUTF8StringEncoding];
// 4. 通過(guò)KVO設(shè)置濾鏡inputMessage數(shù)據(jù)
[filter setValue:data forKey:@"inputMessage"];
// 5. 獲得濾鏡輸出的圖像
CIImage *outputImage = [filter outputImage];
// 6. 將CIImage轉(zhuǎn)換成UIImage拣宰，并放大顯示 (此時(shí)獲取到的二維碼比較模糊,所以需要用下面的createNonInterpolatedUIImageFormCIImage方法重繪二維碼)
//? ? UIImage *codeImage = [UIImage imageWithCIImage:outputImage scale:1.0 orientation:UIImageOrientationUp];
self.QrCodeImageView.image = [self createNonInterpolatedUIImageFormCIImage:outputImage withSize:200];//重繪二維碼,使其顯示清晰
}
/**
* 根據(jù)CIImage生成指定大小的UIImage
*
* @param image CIImage
* @param size 圖片寬度
*/
- (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];
}
