多张UIImage图片合成一张

最新推荐文章于 2021-06-03 11:11:32 发布

大麦komo

最新推荐文章于 2021-06-03 11:11:32 发布

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本文介绍了一种在iOS应用中实现多个图片的合成并保存到相册的方法。使用UIGraphicsBeginImageContext开始图像上下文，将主图片绘制到上下文中，并通过循环遍历图片数组将各个子图片绘制到指定位置，最后利用CGImageCreateWithImageInRect创建最终的合成图片。

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 NSAutoreleasePool

*pool = [[NSAutoreleasePool

alloc]

init];

    UIGraphicsBeginImageContext(mainImg.size);

    [mainImg

drawInRect:CGRectMake(0,
0,
 mainImg.size.width,
 mainImg.size.height)];

    int

i = 0;

    for

(UIImage

*img in

imgArray) {

        [img

drawInRect:CGRectMake([[imgPointArray

objectAtIndex:i]

floatValue],

                                   [[imgPointArray

objectAtIndex:i+1]

floatValue],

                                   img.size.width,

                                   img.size.height)];

        i+=2;

    }

    CGImageRef

NewMergeImg 
= CGImageCreateWithImageInRect(UIGraphicsGetImageFromCurrentImageContext().CGImage,

                                                          CGRectMake(0,
0,
 mainImg.size.width,
 mainImg.size.height));

    UIGraphicsEndImageContext();

    [pool

release];

    if

(NewMergeImg

== 
nil)
 {

        return

NO;

    }

    else

{

        UIImageWriteToSavedPhotosAlbum([UIImage

imageWithCGImage:NewMergeImg],
self,

nil,

nil);

        return

YES;

    }