Question

我的class foo(){ private: void a(){ // function definition } } class other_foo(){ public: void b(foo f){ // function definition } }有一个UIImageView。我想要的是，当点击UIImage时，用户可以从他们的库中选择一张照片，以显示UIImage而不是我设置的默认图片

UIImageView

编辑：如果我可以使用一堆图像制作视图，并且当单击图像时，如果有意义，则将“myimg”更改为单击的图像

编辑＃2：另外，如何保存用户选择的照片，并在用户下次打开应用程序时使用它

Answer 1

您需要的是使用UIImagePickerController作为源类型实现UIImagePickerControllerSourceTypePhotoLibrary。

stackoverflow中有大量的教程和问题/答案。

检查例如thread。它有很好的答案，参考链接到Apple的示例代码和其他有趣的教程。

编辑＃2：编辑＃2：嗯，这也有很多方法可以完成，这取决于你的用例。但快速简单的方法是使用NSUserDefaults。

例如：这样可以保存图像，

NSData * data = UIImagePNGRepresentation(yourUImage);
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:data forKey:@"userImage"];
[defaults synchronize];

并获取图片

- (void)viewDidLoad 
{
    [super viewDidLoad];

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSData *data = [defaults objectForKey:@"userImage"];
    UIImage *image = [UIImage imageWithData:data];

    yourImageView.image = image;
}

Answer 2

UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(imageAction:)];
                    [self.imgPhotoStrand setUserInteractionEnabled:YES];
                    [self.imgPhotoStrand addGestureRecognizer:tapGesture];

 -(void)imageAction:(UITapGestureRecognizer *)sender{ 
   UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Edit Photo"
                                                                                 delegate:self
                                                                        cancelButtonTitle:@"Cancel"
                                                                   destructiveButtonTitle:nil
                                                                        otherButtonTitles:@"Camera", @"Select from Library", nil];
                    actionSheet.actionSheetStyle = UIActionSheetStyleAutomatic;
                    [actionSheet showInView:self.view];
 }

 #pragma mark - UIActionSheetDelegate -

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
            {
                switch(buttonIndex)
                {
                    case 0:
                    {
                        if ([UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera]) {

                            if (IS_IPAD) {
                                [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                                     [self camera];
                                }];
                            }else if(IS_IPHONE){
                                 [self camera];
                            }
                        }
                        else
                        {
                            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:ALERTTITLE message:@"No Camara Found" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
                            [alertView show];
                        }

                    }
                        break;
                    case 1:
                    {
                        if (IS_IPAD) {
                            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                                [self library];
                            }];
                        }else if(IS_IPHONE){
                            [self library];
                        }

                    }
                    default:
                        // Do Nothing.........
                        break;
                }
            }


        - (void)camera {
            if(![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
                return;
            }
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
            //Permetto la modifica delle foto
            picker.allowsEditing = YES;
            //Imposto il delegato
            [picker setDelegate:self];

            [self presentViewController:picker animated:YES completion:nil];
        }
- (void)library {
            //Inizializzo la classe per la gestione della libreria immagine
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            //Permetto la modifica delle foto
            picker.allowsEditing = YES;
            //Imposto il delegato
            [picker setDelegate:self];

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


 #pragma mark UIImagePickerController Delegate
    - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

        [self dismissViewControllerAnimated:YES completion:^{



                UIImage *image = [info valueForKey:UIImagePickerControllerEditedImage];
                 self.imgPhotoStrand.image =image;

        }];


    }
 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
        [self dismissViewControllerAnimated:YES completion:nil];
    }

Answer 3

您可以使用UIImagePickerController从图库中获取图片并在图片视图中显示

此代码将您带到Gallery

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:picker animated:YES completion:NULL];

然后这是UIImagePickerController

的委托方法

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

    chosenImage = info[UIImagePickerControllerEditedImage];
    yourImageView.image = chosenImage;

    [picker dismissViewControllerAnimated:YES completion:NULL];
}

这对我有用。希望它有所帮助。

1]您可以为每个图像使用自定义按钮，这样当您单击图像按钮时，目标会被调用，您可以使用单击的图像更改图像。

2]为了存储图像，您可以使用NSUserDefaults，这样即使应用程序关闭，您的图像也会存储在NSUserDefaults中，以便您下次用户打开应用程序时可以使用它。 / p>

NSData *imageData = UIImageJPEGRepresentation(chosenImage, 1.0);
encodedString = [imageData base64EncodedStringWithOptions:0];
NSLog(@"chosenImage : %@",chosenImage);

这将为您提供图像。

要将此图片设置为ImageView，您可以使用

UIImage *image = [UIImage imageWithData:data];
yourImageView.image = image;

希望它有所帮助。

允许用户将图像更改为其库中的图像

3 个答案: