这是我的第一个问题
我有一个“小”问题: 当我在 iOS 7 上读取 UIImage 元数据时，我使用了这段代码，效果很好
#pragma mark - Image Picker Controller delegate methods
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage];
[self metaDataFromAssetLibrary:info];
[picker dismissViewControllerAnimated:YES completion:NULL];
}
从 imagePickerController 我选择图像并调用 metaDataFromAssetLibrary 方法
- (void) metaDataFromAssetLibrary:(NSDictionary*)info
{
NSURL *assetURL = [info objectForKey:UIImagePickerControllerReferenceURL];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library assetForURL:assetURL
resultBlock:^(ALAsset *asset) {
NSMutableDictionary *imageMetadata = nil;
NSDictionary *metadata = asset.defaultRepresentation.metadata;
imageMetadata = [[NSMutableDictionary alloc] initWithDictionary:metadata];
NSLog (@"imageMetaData from AssetLibrary %@",imageMetadata);
}
failureBlock:^(NSError *error) {
NSLog (@"error %@",error);
}];
}
在 Xcode5 和 iOS7 控制台上返回类似这样的内容
imageMetaData from AssetLibrary {
ColorModel = RGB;
DPIHeight = 72;
DPIWidth = 72;
Depth = 8;
Orientation = 1;
PixelHeight = 2448;
PixelWidth = 3264;
"{Exif}" = {
ApertureValue = "2.52606882168926";
BrightnessValue = "2.211389961389961";
ColorSpace = 1;
ComponentsConfiguration = (
1,
2,
3,
0
);
DateTimeDigitized = "2014:06:05 08:54:09";
DateTimeOriginal = "2014:06:05 08:54:09";
ExifVersion = (
2,
2,
1
);
ExposureMode = 0;
ExposureProgram = 2;
ExposureTime = "0.05";
FNumber = "2.4";
Flash = 24;
FlashPixVersion = (
1,
0
);
FocalLenIn35mmFilm = 35;
FocalLength = "4.28";
ISOSpeedRatings = (
125
);
LensMake = Apple;
LensModel = "iPhone 4S back camera 4.28mm f/2.4";
LensSpecification = (
"4.28",
"4.28",
"2.4",
"2.4"
);
MeteringMode = 3;
PixelXDimension = 3264;
PixelYDimension = 2448;
SceneCaptureType = 0;
SceneType = 1;
SensingMethod = 2;
ShutterSpeedValue = "4.321928460342146";
SubjectArea = (
1643,
1079,
610,
612
);
SubsecTimeDigitized = 347;
SubsecTimeOriginal = 347;
WhiteBalance = 0;
};
"{GPS}" = {
Altitude = 26;
AltitudeRef = 1;
DateStamp = "2014:06:05";
DestBearing = "177.086387434555";
DestBearingRef = M;
ImgDirection = "357.0864197530864";
ImgDirectionRef = M;
Latitude = "43.80268";
LatitudeRef = N;
Longitude = "11.0635195";
LongitudeRef = E;
Speed = 0;
SpeedRef = K;
TimeStamp = "06:54:08";
};
"{MakerApple}" = {
1 = 0;
3 = {
epoch = 0;
flags = 1;
timescale = 1000000000;
value = 27688938393500;
};
4 = 1;
5 = 186;
6 = 195;
7 = 1;
8 = (
"-0.6805536",
"0.02519802",
"-0.755379"
);
};
"{TIFF}" = {
DateTime = "2014:06:05 08:54:09";
Make = Apple;
Model = "iPhone 4S";
Orientation = 1;
ResolutionUnit = 2;
Software = "8.0";
XResolution = 72;
YResolution = 72;
};
}
但是在 Xcode6 和 iOS 8 控制台上仅返回这个
imageMetaData from AssetLibrary {
ColorModel = RGB;
DPIHeight = 72;
DPIWidth = 72;
Depth = 8;
Orientation = 1;
PixelHeight = 768;
PixelWidth = 1020;
"{Exif}" = {
ColorSpace = 1;
ComponentsConfiguration = (
1,
2,
3,
0
);
ExifVersion = (
2,
2,
1
);
FlashPixVersion = (
1,
0
);
PixelXDimension = 1020;
PixelYDimension = 768;
SceneCaptureType = 0;
};
"{TIFF}" = {
Orientation = 1;
ResolutionUnit = 2;
XResolution = 72;
YResolution = 72;
};
}
有人知道这个问题吗？
有什么解决方案或建议吗？
非常感谢
P.S.:请原谅我糟糕的英语;-)
最佳答案
升级到Xcode6后，你必须在dismissViewController的完成 block 中获取图像，或者更复杂的方法:从资源中获取图像。
请尝试以下代码:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[picker dismissViewControllerAnimated:YES completion::^{
UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage];
[self metaDataFromAssetLibrary:info];
}];
您也可以引用 john.k.doe 的回答 didFinishPickingMediaWithInfo return nil photo
关于uiimage - iOS 8 UIImage 元数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24227578/