小编Uxx*_*ish的帖子

我目前正在开展一个项目,我需要阅读一些(纬度,经度和日期)EXIF数据.位置数据似乎是正确的,但我得到的日期似乎是"最后修改日期"日期.

{
    CLLocation *loc = [asset valueForProperty:ALAssetPropertyLocation];
    NSDate *date = [asset valueForProperty:ALAssetPropertyDate];
    //Returns Last modified date(Picture was taken ... let's say september 
    //last year and it would return the date and time I 'modified' the image).
    NSString *latitude  = [NSString stringWithFormat:@"%g",loc.coordinate.latitude];//Returns correct Latitude
    NSString *longitude = [NSString stringWithFormat:@"%g",loc.coordinate.longitude];//Returns correct Longitude
}

我的问题是:我做的事情是非常错误的,还是这种预期的行为.我也尝试使用loc.timestamp而不是[asset valueForProperty:ALAssetPropertyDate]但这些返回相同的日期.任何帮助是极大的赞赏 !

嘿伙计们,我目前正试图通过用户从用户选择的图像中获取EXIF数据UIIMagePickerController.我似乎无法理解如何获得我可以使用的路径CGImageSourceCreateWithURL((CFURLRef)someURL,nil).

当我尝试使用UIImagePickerControllerReferenceURL控制台时吐出一个相当不错的错误:<ERROR> CGImageSourceCreateWithURLCFURLCreateDataAndPropertiesFromResource failed with error code -11..我很难过,我开始认为我来自一个完全错误的角度,因为这种CGImageSourceRef类型通常用于创建图像,而我已经有了UIImage.任何能够解释这个问题的人,请随时这样做.

- (void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary *)info {

NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
[self dismissModalViewControllerAnimated:YES];
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]){
    image = [info objectForKey:UIImagePickerControllerOriginalImage];
    NSLog(@"%@",[info objectForKey:UIImagePickerControllerReferenceURL]);
    //Outputs: assets-library://asset/asset.JPG?id=1000000006&ext=JPG
    CGImageSourceCreateWithURL((CFURLRef)[info objectForKey:UIImagePickerControllerReferenceURL], nil);

    //The plan is to somehow get a CGImageSourceRef object from the 
    //UIImage provided by the [info UIImagePickerControllerOriginalImage], i just don't know how to get this object,
    // for it requires the URL to the …