保存圖像文件的目錄和檢索的電子郵件附件

Question

我有麻煩搞清楚NSBundle & DocumentDirectory數據，我有一個攝像頭圖片「的ImageView」那我保存到NSDocumentDirectoy，然後想找回它用於連接到電子郵件，

在這裏，既可以節省代碼：

- (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]; 
} 

這是新獲取數據代碼：

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]; 
} 

這應該讓你開始！

Answer 2

由於每個iPhone應用程序都位於自己的沙箱中，因此您無權訪問設備範圍的文檔文件夾。要將圖像附加到電子郵件中，請將圖像保存在您自己的文檔文件夾中。嘗試使用[@「〜/ Documents」StringByExpandingTildeInPath]以獲取您的本地文檔文件夾 - 適用於我。它看起來像用於將圖像附加到電子郵件中的技術是正確的。

希望幫助，

Answer 3

試試這個：

-(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]; 
} 

Answer 4

斯威夫特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 
// ... 

我強迫解開一些自選的簡潔。在代碼中使用guard或if let。