生成二维码

来源：互联网发布：设计软件的模板编辑：程序博客网时间：2024/05/04 19:47

为什么没和条形码一起写？是因为之前项目中都用到了，但是并不是从一个地方寻找到的方法，并且之前的条形码方法是传入宽高和内容直接返回的图片，这个二维码的方法是传入已经建立好的UIImageView和二维码内容与清晰度获得一个二维码。

//调用生成方法（参数1.UIImageView 参数2.二维码内容参数3.清晰度Scale数值越高越清晰）

[self barImageWithImageView:imageView String:@"http://www.baidu.com"Scale:4];

//生成方法

- (void)barImageWithImageView:(UIImageView*)imageView String:(NSString*)str Scale:(CGFloat)scale{    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];    [filter setDefaults];        NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];    [filter setValue:data forKey:@"inputMessage"];        CIImage *outputImage = [filter outputImage];        CIContext *context = [CIContext contextWithOptions:nil];    CGImageRef cgImage = [context createCGImage:outputImage                                      fromRect:[outputImage extent]];        UIImage *image = [UIImage imageWithCGImage:cgImage                                        scale:1.0                                  orientation:UIImageOrientationUp];        UIImage *resized =nil;    CGFloat width = image.size.width*scale;    CGFloat height = image.size.height*scale;        UIGraphicsBeginImageContext(CGSizeMake(width, height));    CGContextRef context1 =UIGraphicsGetCurrentContext();    CGContextSetInterpolationQuality(context1,kCGInterpolationNone);    [image drawInRect:CGRectMake(0,0, width, height)];    resized = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    imageView.image = resized;    CGImageRelease(cgImage);}

感谢观看，学以致用更感谢！

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