允许用户将图像更改为图库中的图像

Question

我有一个 UIImageView 有一个 UIImage。我想要的是，当单击 UIImage 时，用户可以 select 从他们的图库中显示照片 UIImageView 而不是我设置的默认图像

    imageView = [[UIImageView alloc] init];
    UIImage *myimg = [UIImage imageNamed:@"ProfilePic.png"];
    imageView.image=myimg;
    imageView.frame = CGRectMake(100,0, 80, 50); // pass your frame   here
    [setsView addSubview:imageView];
    imageView.layer.backgroundColor=[[UIColor clearColor] CGColor];
    imageView.layer.cornerRadius=20;
    imageView.layer.borderWidth=2.0;
    imageView.layer.masksToBounds = YES;
    imageView.layer.borderColor=[[UIColor redColor] CGColor];

编辑：如果我可以用一堆图像创建一个视图，当单击图像时它会将 "myimg" 更改为单击的图像（如果这有意义的话）

编辑 #2：另外，您将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

您需要以 UIImagePickerControllerSourceTypePhotoLibrary 作为源类型来实现 UIImagePickerController。

Whosebug 中有大量教程和 questions/answers。

例如检查这个 thread。它有很好的答案，带有指向 Apple 示例代码和其他有趣教程的参考链接。

编辑#2：好吧，这也有很多方法可以完成，这取决于您的用例。但是快速简单的方法是使用NSUserDefaults。

例如：这是为了保存图像，

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

并获取图像

- (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 从图库中获取图像并在图像视图中显示它

此代码会将您带到图库

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

然后这里是 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。希望对你有帮助。

1]您可以为每张图片使用自定义按钮，这样当您点击图片按钮时，目标就会被调用，您可以使用点击的图片更改您的图片。

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 中以便下次用户打开应用程序时可以使用它.

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

这将为您提供图像。

要将此图像设置为 ImageView，您可以使用

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

希望对您有所帮助。

允许用户将图像更改为图库中的图像

Allow user to change image to one from their gallery

objective-c

uiimageview

uiimage

ios