iOS 二维码的生成

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我的后面两章文章<<iOS从相册读取二维码>>,<<iOS二维码的直接扫描的读取>>介意借鉴学习

1.在需要生成二维码的界面.  

////// 生成二维码生成的数据-根据公司的要求形成相应的字符串

NSDictionary *dataDictionary= [NSDictionary dictionaryWithObjectsAndKeys:@"PVTLfbmPU6FA01aD1XU20hkX38ew8Vh7Wg3JOXYDRsY=",@"ciphertext",@0,@"openTimes",@"2016-08-26 18:11:33",@"validFrom",@"2018-08-26 18:11:38",@"validTo",@"蓝牙钥匙",@"name",@"D5:CC:F1:13:92:7C",@"mac",@3,@"id",nil];

//////将字典转为jsonString

[self DataTOjsonString:dataDictionary];

///////就是具体的生成jsonString

#pragma mark - 得到jsonString

-(NSString*)DataTOjsonString:(id)object {

NSError *error;

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:object

options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string

error:&error];

if (! jsonData) {

NSLog(@"Got an error: %@", error);

} else {

_jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

}

return _jsonString;

}

//// 调用生成二维码的方法

_shareView.img.scanResultImg.image = [self qrCodeImageWithString:_jsonString];

/////具体生成二维码的方法

#pragma mark - 生成二维码

-(UIImage*)qrCodeImageWithString:(NSString*)str{

if (str && [str isKindOfClass:[NSString class]] && str.length > 0) {

return [self createNonInterpolatedUIImageFromCIImage :[self createQRForString:str]

withSize:180];

} else {

NSLog(@"nil-----");

}

return nil;

}

// 传入字符串-形成二维码

- (CIImage *)createQRForString:(NSString *)qrString

{

// Need to convert the string to a UTF-8 encoded NSData object

NSData *stringData = [qrString dataUsingEncoding: NSUTF8StringEncoding];

NSLog(@"--stringData--%@",stringData);

// Create the filter

CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];

NSLog(@"----qrFilter---%@",qrFilter);

// Set the message content and error-correction level

[qrFilter setValue:stringData forKey:@"inputMessage"];

[qrFilter setValue:@"L" forKey:@"inputCorrectionLevel"];

NSLog(@"--qrFilter.outputImage%@----",qrFilter.outputImage);

// Send the image back

return qrFilter.outputImage;

}

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

{

CGRect extent = CGRectIntegral(image.extent);

CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));

// 创建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);

// 保存bitmap到图片

CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);

CGContextRelease(bitmapRef);

CGImageRelease(bitmapImage);

UIImage *img = [UIImage imageWithCGImage:scaledImage];

if (img) {

[self tapSaveImageToIphone:img];

return img;

} else {

return nil;

}

}

// 保存图片到相册

- (void)tapSaveImageToIphone:(UIImage *)img{

/**

*  将图片保存到iPhone本地相册

*  UIImage *image            图片对象

*  id completionTarget      响应方法对象

*  SEL completionSelector    方法

*  void *contextInfo

*/

UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

}

// 相册存入成功回调

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void*)contextInfo{

//    if (error == nil) {

//

//        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"已存入手机相册" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil, nil];

//        [alert show];

//

//    }else{

//

//        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"保存失败" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil ,nil];

//        [alert show];

//    }

}