iOS 关于图片地理位置隐私信息的分析和读取

今天突然想到微信朋友圈发照片，涉及个人隐私的地理位置是否外泄。因为iphone拍照的照片都会带有地理位置等信息，我们先来实现怎么读取里面的安全信息，然后再来分析

 

#import "ViewController.h"
#import <ImageIO/ImageIO.h>
#import <AssetsLibrary/AssetsLibrary.h>
@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];


    //创建一个UIImagePickerController对象
    UIImagePickerController *ctrl = [[UIImagePickerController alloc] init];
    //设置类型
    ctrl.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    //设置代理
    ctrl.delegate = self;

    //显示
    [self presentViewController:ctrl animated:YES completion:nil];




}

-(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 *GPS = [imageMetadata objectForKey:(NSString *)kCGImagePropertyGPSDictionary];
                     NSLog(@"－－－－－－－－%@",GPS);//地理位置信息
                     NSLog(@"%@",imageMetadata);

                 }
                failureBlock:^(NSError *error) {
                }];
    }


}