在图像视图图像上写文本 [英] write text on image view image

问题描述

目前，我正在开发一个应用程序，其中我有一个图像视图，其中图像经常

Currently, I am developing an App in which I have a Image view on which image are constantly

一段时间后发生变化。现在我希望我能够写一些文字或绘制任何符号

changes after some time. Now I want that I am able to write some text or draw any symbol

，简单的线条，十字线意味着说图像在图像视图中出现。意思是我想要

,simple line,cross line means to say drawing on image appears in image view. Means I want to

在图像上添加文字或绘制一些符号或线条e.t.c。我到处搜索但不能

add text or drawing some symbols or lines e.t.c on image. I am searching everywhere but can't

找到任何解决方案。我怎么解决这个问题？在此先感谢。

find any solution. How can I solve this? Thanks in advance.

推荐答案

看看是否有效：

//Add text to UIImage

-(UIImage *)addText:(UIImage *)img text:(NSString *)text1{

    int w = img.size.width;

    int h = img.size.height; 

    //lon = h - lon;

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);



    CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);

    CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1);

    char* text  = (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding];// "05/05/09";

    CGContextSelectFont(context, "Arial", 18, kCGEncodingMacRoman);

    CGContextSetTextDrawingMode(context, kCGTextFill);

    CGContextSetRGBFillColor(context, 255, 255, 255, 1);



    //rotate text

    CGContextSetTextMatrix(context, CGAffineTransformMakeRotation( -M_PI/4 ));

    CGContextShowTextAtPoint(context, 4, 52, text, strlen(text));

    CGImageRef imageMasked = CGBitmapContextCreateImage(context);

    CGContextRelease(context);

    CGColorSpaceRelease(colorSpace);

    return [UIImage imageWithCGImage:imageMasked];

}

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