1 用途： 是系统提供的用来获取图片和视频的接口；

2获取图片途径：拍照，图库，相册获取

enum {

   UIImagePickerControllerSourceTypePhotoLibrary ,//来自图库

   UIImagePickerControllerSourceTypeCamera ,//来自相机

   UIImagePickerControllerSourceTypeSavedPhotosAlbum //来自相册

};

3 步骤：

  1. 初始化一个UIImagePickerController类

  2. 设置数据来源类型，—— 上面2

  3. 设置代理

  4. 如果需要对图片进行修改，allowsEditing = yes

4 具体代码实现

#pragma mark 选择图片

- (IBAction)selectImage:(UITapGestureRecognizer *)sender{

    //图片选择控制器
    UIImagePickerController *pickerController=[[UIImagePickerController alloc] init];

    //选择你要使用的类型 图集，相册，相机   pickerController.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;

    pickerController.delegate=self;

    pickerController.allowsEditing=YES;
    [self presentViewController:pickerController animated:YES completion:nil];

}

#pragma mark delegate

-(void)p_w_picpathPickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
   //根据选择的图片 设置头像

  _IconImage.p_w_picpath=info[@"UIImagePickerControllerOriginalImage"];

   [picker dismissViewControllerAnimated:YES completion:^{

   }];

}