如何存储应用程序文件夹中生成的qrcode(图像)

Question

我想将生成的二维码存储在我的应用程序文件夹中。然后将其用作 UITableView 中单元格的附件视图。

-(void)generateQRCode
{
    NSError *err;    
    NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];
    [dict setValue:[Utility customerID] forKey:@"customerID"];
    [dict setValue:serverPath.text forKey:@"serverPath"];
    NSData *json = [NSJSONSerialization dataWithJSONObject:dict options:0 error:&err];
    NSString *jsonString = [[NSString alloc] initWithData:json encoding:NSISOLatin1StringEncoding];
    NSData *data = [jsonString dataUsingEncoding:NSISOLatin1StringEncoding];
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    [filter setValue:data forKey:@"inputMessage"];
    [filter setValue:@"Q" forKey:@"inputCorrectionLevel"];
    qrcodeImage = filter.outputImage;
    _imgQRCode.image = [UIImage imageWithCIImage:qrcodeImage];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentPaths = [paths objectAtIndex:0];
    filepath = [documentPaths stringByAppendingString:@"qrcodeImage.png"];
    NSData *pngData = UIImagePNGRepresentation(_imgQRCode.image);
    [pngData writeToFile:filepath atomically:YES];
}

Answer 1

此功能将返回文档目录的路径。

func getDocumentsDirectory() -> NSString {
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let documentsDirectory = paths[0]
return documentsDirectory}

您可以使用以下代码将图像保存在文档中：

if let image = UIImage(named: "example.png") {
if let data = UIImagePNGRepresentation(image) {
    let filename = getDocumentsDirectory().stringByAppendingPathComponent("copy.png")
    data.writeToFile(filename, atomically: true)
}}

保存图像后，您可以重新加载表视图并配置单元格。如果您不知道如何配置附件视图，请告诉我。