在Imageview中绘制线条 [英] Draw Line in Imageview

问题描述

如何在图像视图中画线？



请帮我。

解决方案

UIImageView用于显示现有图像。



它是UIView的子类。



最多直接绘制视图的方法是通过UIView：



UIView有一个-layer方法，可以访问视图的CALayer。



CALayer有一个方法-drawInContext：它接受在图层上绘制的CGContext。



如果你看一下参考CGContext [核心图形上下文]，您将找到绘制各种内容的函数。



对于绘制线，您需要处理定义和填充路径的函数

How to Draw Line in Image View??

Pls needful for me.

解决方案

A UIImageView is for displaying an existing image.

It is a subclass of UIView.

The most direct way to draw to a view is via the UIView:

UIView has a -layer method that gives you access to the CALayer of the view.

CALayer has a method -drawInContext: that takes a CGContext that gets drawn on the layer.

If you look at the refrence for CGContext [Core Graphics Context], you will find functions for drawing various things.

For drawing lines, you want the functions that deal with defining and filling "paths".

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