将图像保存到“文档”目录并检索电子邮件附件

Question

我在查明NSBundle和DocumentDirectory数据时遇到问题，我有一个要保存到NSDocumentDirectoy的相机图片“ imageView ”，然后想要检索它以附加到电子邮件中，

这里保存代码：

- (IBAction)saveImage {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:@"savedImage.png"];
    UIImage *image = imageView.image; // imageView is my image from camera
    NSData *imageData = UIImagePNGRepresentation(image);
    [imageData writeToFile:savedImagePath atomically:NO];   
}

这是新的获取数据代码：

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"savedImage.png"];
    NSData *myData = [[[NSData alloc] initWithContentsOfFile:appFile] autorelease];
    [picker addAttachmentData:myData mimeType:@"image/png" fileName:@"savedImage"];

Answer 1

- (IBAction)getImage {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,     NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *getImagePath = [documentsDirectory stringByAppendingPathComponent:@"savedImage.png"];
    UIImage *img = [UIImage imageWithContentsOfFile:getImagePath];
}

这应该让您开始！

Answer 2

迅捷3

// Create a URL
let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
let imageURL = documentsURL?.appendingPathComponent("MyImageName.png")

// save image to URL
let myImage = imageView.image! // or wherever you have your UIImage

do {
    try UIImagePNGRepresentation(myImage)?.write(to: imageURL!)
} catch {}


// Use the URL to retrieve the image for sharing to email, social media, etc.
// docController.URL = imageURL
// ...

为了简洁起见，我强制展开了一些可选的选项。 if let您的代码if let ，请使用guard或。

Answer 3

由于每个iPhone应用程序都在其自己的沙箱中，因此您无权访问设备范围的文档文件夹。 要将图像附加到电子邮件，请将图像保存在您自己的文档文件夹中。 尝试使用[@“〜/ Documents” StringByExpandingTildeInPath]来获取本地文档文件夹-适用于我。 您用于将图像附加到电子邮件的技术似乎是正确的。

希望能有所帮助，

Answer 4

试试这个：

 -(void)setProfilePic
{
  NSArray *docpaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsDirectory = [docpaths objectAtIndex:0];
  NSString *imagePath = [documentsDirectory stringByAppendingPathComponent:@"Image.png"];

  NSData *imgData = [[NSData alloc] initWithContentsOfURL:[NSURL fileURLWithPath:imagePath]];
  UIImage *thumbNail = [[UIImage alloc] initWithData:imgData];
  [profilePic_btn setBackgroundImage:thumbNail forState:UIControlStateNormal];
}