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qrcode存储在我的应用程序文件夹中。然后用它作为UITableView中单元的附件视图。

-(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

这个函数将返回你的文件目录路径。

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

您可以使用此代码保存图像文件中的目录：

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，你可以重新载入你的tableview和单元配置。让我知道你是否不知道如何配置配件视图。