在我的iOS应用程序中,我必须对UIImage
进行一些修改,例如在其上添加水印。之后,我想用原始元数据保存图像,但如果我尝试使用writeImageDataToSavedPhotosAlbum:metadata:completionBlock:
,则在生成的图像中没有任何内容。如何保存与原始元数据的修改后的UIImage?
由于我必须修改图像,所以我必须通过NSData
对于metadata:
部分使用以下方法:UIImageJPEGRepresentation(UIImage *, float)
。
,右保存图像之前,元数据是这样的:
Meta: {
ApertureValue = "2.526068811667587";
BrightnessValue = "-1.807443054797895";
ExposureMode = 0;
ExposureProgram = 2;
ExposureTime = "0.05882352941176471";
FNumber = "2.4";
Flash = 16;
FocalLenIn35mmFilm = 33;
FocalLength = "4.12";
ISOSpeedRatings = (
800
);
LensMake = Apple;
LensModel = "iPhone 5c back camera 4.12mm f/2.4";
LensSpecification = (
"4.12",
"4.12",
"2.4",
"2.4"
);
MeteringMode = 3;
PixelXDimension = 3264;
PixelYDimension = 2448;
SceneType = 1;
SensingMethod = 2;
ShutterSpeedValue = "4.058917734171294";
WhiteBalance = 0;
"{GPS}" = {
Altitude = "147.9932";
DOP = "76.42908";
Latitude = "45.7398";
LatitudeRef = N;
Longitude = "126.6266";
LongitudeRef = E;
TimeStamp = "2013:12:23 08:45:30";
};
那么,什么是错在这里?
你得到任何异常?任何控制台日志输出?写入图像的实际代码是否被执行? – ColinE
不,没有任何例外.. –