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

1. #import "ViewController.h"
2. #import <ImageIO/ImageIO.h>
3. #import <AssetsLibrary/AssetsLibrary.h>
4. @interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
5. @end
6. @implementation ViewController
7. - (void)viewDidLoad {
8. [super viewDidLoad];
9. //创建一个UIImagePickerController对象
10. UIImagePickerController *ctrl = [[UIImagePickerController alloc] init];
11. //设置类型
12. ctrl.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
13. //设置代理
14. ctrl.delegate = self;
15. //显示
16. [self presentViewController:ctrl animated:YES completion:nil];
17. }
18. -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
19. {
20. if(picker.sourceType == UIImagePickerControllerSourceTypePhotoLibrary){
21. //UIImage *image= [info objectForKey:UIImagePickerControllerOriginalImage];
22. NSURL *assetURL = [info objectForKey:UIImagePickerControllerReferenceURL];
23. ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
24. [library assetForURL:assetURL
25. resultBlock:^(ALAsset *asset) {
26. NSDictionary* imageMetadata = [[NSMutableDictionary alloc] initWithDictionary:asset.defaultRepresentation.metadata];
27. NSDictionary *GPS = [imageMetadata objectForKey:(NSString *)kCGImagePropertyGPSDictionary];
28. NSLog(@"－－－－－－－－%@",GPS);//地理位置信息
29. NSLog(@"%@",imageMetadata);
30. }
31. failureBlock:^(NSError *error) {
32. }];
33. }
34. }