使图像出现...如何?

织梦狗教程移动开发问题

2022-01-01

Making images appear... How?(使图像出现...如何?)

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问题描述

有人可以告诉我如何在用户点击屏幕时显示图像并使其出现在点击的位置.提前致谢，泰特

Could someone please tell me how to make an image appear when the user taps the screen and make it appear at the position of the tap. Thanks in advance, Tate

推荐答案

UIView 是 UIResponder，它有以下方法可能有帮助: -touchesBegan:withEvent:, -touchesEnded:withEvent:, -touchesCancelled:withEvent: 和 -touchesMoved:withEvent:.


UIView is a subclass of UIResponder, which has the following methods that might help: -touchesBegan:withEvent:, -touchesEnded:withEvent:, -touchesCancelled:withEvent: and -touchesMoved:withEvent:.
每个参数的第一个参数是 UITouch 对象的 NSSet.UITouch 有一个 -locationInView: 实例方法，它应该在您的视图中产生水龙头的位置.
The first parameter of each of those is an NSSet of UITouch objects. UITouch has a -locationInView: instance method which should yield the position of the tap in your view.

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