将图像从UIImageView复制到UIView

Question

I wish to copy an image from the UIImageView to UIView.

I have written the swipe gesture for the UIImageView to select images and need to know how to duplicate multiple images from UIImageView to UIView when user click the Add button. I want user to be able to duplicate different image into the UIView. I will be able to arrange it later.

- (IBAction)handleSwipe:(UIGestureRecognizer *)sender {
    //NSLog(@"swipe");

    NSArray *images=[[NSArray alloc] initWithObjects:
                     @"all_LE2_Series_capacitor.jpg",
                     @"all_LE2_Series_inductor.jpg",
                     @"all_LE2_Series_msline.jpg",
                     @"all_LE2_Series_resistor.jpg",
                     @"all_LE2_Short_stub.jpg", nil];

    UISwipeGestureRecognizerDirection direction = [(UISwipeGestureRecognizer *) sender direction];

    switch (direction){
        case UISwipeGestureRecognizerDirectionLeft: imageIndex++;
            break;
        case UISwipeGestureRecognizerDirectionRight: imageIndex--;
            break;
        default:
            break;
    }
    imageIndex = (imageIndex < 0) ? ([images count] -1):
    imageIndex % [images count];
    imageView.image = [UIImage imageNamed:[images objectAtIndex:imageIndex]];
}

- (IBAction)Add:(UIButton *)sender {
    dropTarget.center = imageView.center;
    [self.view addSubview:dropTarget];
}

GUI Design

Answer 1

要更改UIView背景图片，您可以使用

myview.backgroundColor = [UIColor colorWithPatternImage:myimage];

Answer 2

This is my take on this:

First, you are unnecessarily adding images in your images array every time inside handleSwipe: . Make images a class level property and add your images once, probably in loadView: method.

Next, keep hold on to your current imageIndex . Move this to class level property if not already there.

Finally, in your view, add your selected image like this:

UIImageView *selectedImageView = [[UIImageView alloc] initWithImage:self.images[self.imageIndex]];
[self.view addSubView:selectedImageView]