ShutterSpeedValue = "3.906905";
SubjectArea = (
2815,
1187,
610,
612
);
WhiteBalance = 0;
};
"{GPS}" = {
Altitude = "27.77328";
AltitudeRef = 0;
Latitude = "22.5645";
LatitudeRef = N;
Longitude = "113.8886666666667";
LongitudeRef = E;
TimeStamp = "14:11:23.36";
};
"{TIFF}" = {
DateTime = "2013:06:24 22:11:30";
Make = Apple;
Model = "iPhone 5";
Orientation = 6;
ResolutionUnit = 2;
Software = "6.1.4";
XResolution = 72;
YResolution = 72;
"_YCbCrPositioning" = 1;
};
}
从中我们可以看出最开始的几项分别显示了当前图片的颜色模式，色深，x，y方向的DPI，实际像素以及图片的方向。我最开始看到这个方向时，心中一喜这不是UIImage中的imageOrientation，但是实验发现这个方向和UIImage中的imageOrientation并不相等，此处的方向是exif标准定义的方向，从1到8分别对应这UIImage中的8个方向，只是顺序不一样，它们对应关系如下:
复制代码
enum {
exifOrientationUp = 1, // UIImageOrientationUp
exifOrientationDown = 3, // UIImageOrientationDown
exifOrientationLeft = 6, // UIImageOrientationLeft
