[Cocoa]_[初级]_[在一张图片上添加图片水印和文字水印]

最新推荐文章于 2020-07-28 11:06:10 发布

Foreveroriginal

最新推荐文章于 2020-07-28 11:06:10 发布

阅读量1.2k

点赞数

CC 4.0 BY-SA版权

分类专栏： OC Cocoa 文章标签： objective-c cocoa 图片 NSImage mac

本文链接：https://blog.youkuaiyun.com/moqj_123/article/details/40977963

Cocoa 同时被 2 个专栏收录

31 篇文章

订阅专栏

30 篇文章

订阅专栏

本文介绍如何使用Objective-C在Mac平台上通过Cocoa框架为图片添加图片水印和文字水印。首先创建NSImage对象并加载源图片和水印图片，然后在图片上绘制水印，最后保存带有水印的图片到指定路径。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

  -(void) doLoadImageData
{
    float width = 400;
    float height = 400;
    NSImage *finalImage = [[NSImage alloc] initWithSize:NSMakeSize(width, height)];
    
    //  obtain images - your sources may vary
    
    NSImage *mainImage = [[NSImage alloc] initWithContentsOfFile:@".../sourceImage.jpg"];
    
    NSImage *overImage = [[NSImage alloc] initWithContentsOfFile: @".../overImage.jpg"];
      
    [finalImage lockFocus];
    CGContextRef myContext = [[NSGraphicsContext currentContext] graphicsPort];
    // draw the base image
    [mainImage drawInRect:NSMakeRect(0, 0, width, height)  fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0 respectFlipped:YES hints:nil];
    
    // draw the overlay image at some offset point
    [overImage drawInRect:NSMakeRect(0, 100, 50, 50)fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:0.5 respectFlipped:YES hints:nil];
    
    [self MyDrawText:myContext];
    
    [finalImage unlockFocus];
   
    NSData *finalData = [finalImage TIFFRepresentation];
    NSBitmapImageRep *imageRep =[NSBitmapImageRep imageRepWithData:finalData];
    NSData *data =[imageRep representationUsingType:NSJPEGFileType properties:nil];
    [data writeToFile:@"/Users/mac-d1/work/waterMark.jpg" atomically:YES];
}

-(void) MyDrawText:(CGContextRef) myContext   // 1
{
    CGContextSelectFont (myContext, "Helvetica-Bold",10,kCGEncodingMacRoman);
    // CGContextSetCharacterSpacing (myContext, 0.5); // 4
    CGContextSetTextDrawingMode (myContext, kCGTextFill); // 5
    
    CGContextSetRGBFillColor (myContext, 0, 1, 0, 0.5); // 6
    //CGContextSetRGBStrokeColor (myContext, 0, 1, 0, 0.2); // 7
    CGContextShowTextAtPoint (myContext,20 , 20, "www.Amacsoft.com", 16); // 10
    
}