UIImagePickerController

遵循的代理是：UIImagePickerControllerDelegate,UINavigationControllerDelegate

实现的代理方法是:

选了某一张照片后调用这个方法

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{

UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

}

点击相册界面 cancel 的触发方法

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

 

UIImagePickerController *picker =[[UIImagePickerController alloc]init];

   picker.delegate =self;

        设置类型（相册、摄像头）

picker.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;

去系统的相片的界面 只能用 presntent

[self presentViewController:picker animated:YES completion:nil];