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：

初始化一个UIImagePickerController类

设置数据来源类型，—— 上面2

设置代理

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:^{
}];

}