將UIImage元數據打印到標籤

我試圖從UIImagePicker中讀取由UIImage產生的元數據，並且遇到了一些麻煩。將UIImage元數據打印到標籤

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { 
image = [info objectForKey:@"UIImagePickerControllerOriginalImage"]; 

// get the metadata 
NSDictionary *imageMetadata = [info objectForKey:UIImagePickerControllerMediaMetadata]; 
NSLog (@"imageMetaData %@",imageMetadata);

這成功地將元數據字典打印到NSLog。

我遇到的問題是我想訪問字典的特定索引（如FNumber，ISO等）並將它們打印到特定標籤，但我無法弄清楚如何訪問個人數據。

這是我迄今試圖把數據，但它似乎並沒有找到問題的關鍵（返回爲NULL）：

NSLog(@"ISO: %@", imageMetadata[@"ISOSpeedRatings"]);

基於斷什麼的NSLog打印的字典，似乎字典中可能有字典，這就是拋棄我的東西。

這裏是被打印的元數據：

imageMetaData { 
DPIHeight = 72; 
DPIWidth = 72; 
Orientation = 6; 
"{Exif}" =  { 
    ApertureValue = "2.27500704749987"; 
    BrightnessValue = "-0.6309286396300304"; 
    ColorSpace = 1; 
    DateTimeDigitized = "2015:04:01 10:33:37"; 
    DateTimeOriginal = "2015:04:01 10:33:37"; 
    ExposureBiasValue = 0; 
    ExposureMode = 0; 
    ExposureProgram = 2; 
    ExposureTime = "0.06666666666666667"; 
    FNumber = "2.2"; 
    Flash = 24; 
    FocalLenIn35mmFilm = 29; 
    FocalLength = "4.15"; 
    ISOSpeedRatings =   (
     320 
    ); 
    LensMake = Apple; 
    LensModel = "iPhone 6 back camera 4.15mm f/2.2"; 
    LensSpecification =   (
     "4.15", 
     "4.15", 
     "2.2", 
     "2.2" 
    ); 
    MeteringMode = 5; 
    PixelXDimension = 3264; 
    PixelYDimension = 2448; 
    SceneType = 1; 
    SensingMethod = 2; 
    ShutterSpeedValue = "3.907056515078773"; 
    SubjectArea =   (
     1631, 
     1223, 
     1795, 
     1077 
    ); 
    SubsecTimeDigitized = 705; 
    SubsecTimeOriginal = 705; 
    WhiteBalance = 0; 
}; 
"{MakerApple}" =  { 
    1 = 2; 
    14 = 0; 
    2 = <0f000b00 06000900 04005000 a900b100 b700bb00 c400cd00 cd00a400 b100c700 14000b00 05000900 06000a00 8a00a800 b000b800 c300cb00 c900cd00 b300a600 2f000700 06000700 0a000400 3500a400 ab00b300 bc00c300 cf00d300 b4007f00 3f000700 09000700 0a000700 05007100 a100af00 b500c200 ce00cd00 a9006b00 1f000a00 0b000900 0a000c00 05001e00 9c00aa00 b400c200 cc00d000 d4005700 2b001900 0d001000 10000d00 08000600 5b00a700 b300bf00 cb00d500 e3008600 eb002800 1a001700 14000c00 0b000700 10009400 b100c000 ce00e000 f400bd00 cf013e00 2a001200 17000f00 0d000800 07004200 b100c000 d300e900 fd000401 ff011101 1d000700 16001400 09000700 07000900 8900bf00 d800ec00 07011f01 10021102 39000b00 10001900 0e000800 0a000700 2c00bf00 dd00f400 0b012401 1e023802 1f010d00 07001900 16000c00 0c000800 21007000 c500f400 0a012e01 10022202 01022500 08001000 18001100 0d001800 1601cc00 d100eb00 09012201 fb011002 26020401 0f000700 16001400 3200e801 6001b000 ce00f400 08011601 e1010602 1a020302 23001700 21002300 84009300 9f00ad00 bf00e800 02011401 ca01fc01 19024002 08013d00 3500ca00 7c009200 9e00ab00 c200d700 f8000a01 b401f101 1b024802 28023000 4a007f00 7f008e00 a000b100 bd00d000 ec00fe00>; 
    3 =   { 
     epoch = 0; 
     flags = 1; 
     timescale = 1000000000; 
     value = 777291330499583; 
    }; 
    4 = 1; 
    5 = 128; 
    6 = 123; 
    7 = 1; 
    8 =   (
     "0.2226092", 
     "-0.5721548", 
     "-0.7796207" 
    ); 
    9 = 275; 
}; 
"{TIFF}" =  { 
    DateTime = "2015:04:01 10:33:37"; 
    Make = Apple; 
    Model = "iPhone 6"; 
    Software = "8.1.2"; 
    XResolution = 72; 
    YResolution = 72; 
};

}

是我在尋找命名的Exif數據的另一個NSDictionary的範圍內？如果是這樣，我該如何訪問它？

來源

2015-04-07 David Strauss

獲取數據的準確位置，您可以檢查這個答案：http://stackoverflow.com/a/12478773/2155687 –

檢查這讓Exif數據.. .http：//stackoverflow.com/questions/9766394/get-exif-data-from-uiimage-uiimagepickercontroller – Shruti

@大衛·斯特勞斯可以嘗試這個曾經

- (void) saveImage:(UIImage *)imageToSave withInfo:(NSDictionary *)info{ 
// Get the assets library 
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; 

// Get the image metadata (EXIF & TIFF) 
NSMutableDictionary * imageMetadata = [[info objectForKey:UIImagePickerControllerMediaMetadata] mutableCopy]; 

// add GPS data 
CLLocation * loc = <•••>; // need a location here 
if (loc) { 
    [imageMetadata setObject:[self gpsDictionaryForLocation:loc] forKey:(NSString*)kCGImagePropertyGPSDictionary]; 
} 

ALAssetsLibraryWriteImageCompletionBlock imageWriteCompletionBlock = 
^(NSURL *newURL, NSError *error) { 
    if (error) { 
     NSLog(@"Error writing image with metadata to Photo Library: %@", error); 
    } else { 
     NSLog(@"Wrote image %@ with metadata %@ to Photo Library",newURL,imageMetadata); 
    } 
}; 

// Save the new image to the Camera Roll 
[library writeImageToSavedPhotosAlbum:[imageToSave CGImage] 
          metadata:imageMetadata 
         completionBlock:imageWriteCompletionBlock]; 
[imageMetadata release]; 
[library release];

}

來源

2015-04-07 05:53:41

這使我可以將圖像及其元數據寫入照片庫，但現在如何訪問要打印的數據它？ –

的元數據字典，你已經注意到由幾個字典。所以要回答你的問題 - 是的，如果你正在尋找具體的價值觀，你可以訪問內部字典。另外，你最好使用ImageIO常量中正確的鍵;例如：

NSLog(@"%@", imageMetadata[(NSString*)kCGImagePropertyExifDictionary][(NSString*)kCGImagePropertyExifISOSpeedRatings]);

或者，您可以使用一鍵路徑：

NSString *keyPath = [NSString stringWithFormat:@"%@.%@", 
         (NSString*)kCGImagePropertyExifDictionary, (NSString*)kCGImagePropertyExifISOSpeedRatings]; 
NSLog(@"%@", [imageMetadata valueForKeyPath:keyPath]);

來源

2015-04-23 21:43:54 Artal

您所需的所有數據僅爲本字典中。

你可以使用json格式化程序來查看數據的確切位置。

NSError *error; 
NSData *jsonData = [NSJSONSerialization dataWithJSONObject: imageMetadata 
                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 { 
    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]; 
    NSLog(@"jsonString: %@", jsonString); 
}

在此之後，從JSON

來源

2015-06-25 07:15:04 Nik

將UIImage元數據打印到標籤

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