系统照片选取

1.首先在storyBoard中创建一个button和imageView并添加约束

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添加代理方法:

 @interface ViewController ()<UINavigationControllerDelegate,
                            UIImagePickerControllerDelegate>

从storyBoard--imageView中拖拽出来的属性

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

//从storyBoard--button拖拽出来的点击方法

- (IBAction)didClickedPickImageButton:(UIButton *)sender {
//创建UIImagePickerController
UIImagePickerController * imagePicker = [[UIImagePickerController alloc]init];
imagePicker.editing = YES;
imagePicker.allowsEditing = YES;
imagePicker.delegate = self;
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
(从系统相册中选取照片)
//模态出相册界面
[self presentViewController:imagePicker animated:YES completion:nil];
}

//使用选取的图片:

-(void)imagePickerController:(UIImagePickerController     *)
picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
[self dismissViewControllerAnimated:YES completion:nil];
UIImage * selectedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
self.imageView.image = selectedImage;
}

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