调用系统照片库并显示位置信息

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{ 
if(picker.sourceType == UIImagePickerControllerSourceTypePhotoLibrary){ 
//UIImage *image= [info objectForKey:UIImagePickerControllerOriginalImage]; 

NSURL *assetURL = [info objectForKey:UIImagePickerControllerReferenceURL]; 
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; 
[library assetForURL:assetURL 
resultBlock:^(ALAsset *asset) { 
NSDictionary* imageMetadata = [[NSMutableDictionary alloc] initWithDictionary:asset.defaultRepresentation.metadata]; 
NSDictionary *GPSDict=[imageMetadata objectForKey:(NSString*)kCGImagePropertyGPSDictionary]; 
NSLog(@"%@",GPSDict); 
NSLog(@"%@",imageMetadata); 
/* GPSDict 里面即是照片的GPS信息,具体可以输出看看*/ 
} 
failureBlock:^(NSError *error) { 
}]; 
} 
}