ios - 如何将图像拖放到第二个中

Question

我有两张图片，第一张是前景，第二张是背景。我想将它们合并成一个图像。我希望能够将它们拖放frontImage到唯一的background可能吗？

Answer 1

This can be super easy.

For example - You have a parent UIView and two image views:

UIView *_baseView; //as big as the screen.

UIImageView *_backgroundImageView; //as a subview on _baseView

UIImageView *_frontImageView; //as a subview on _baseView

Then You implement some kind of UIImageView movement by finger (for example How do you make an image follow your finger in objective-c? or search for something similar to know how to move UIView objects around if You don't know yet how).

And - once You release Your finger - You can take a screenshot from _baseView and get the image, where two subview ImageViews are combined in a way.

(How Do I Take a Screen Shot of a UIView? or search something similar).

If You don't like, that You have to take screenshot of _baseView, You could also add frontImageView as a subview to background image view and get the screenshot from backgroundImageView.

Hope this idea helps.