iOS view 转image 以及image加水印图片

最新推荐文章于 2023-10-08 14:40:02 发布

原创最新推荐文章于 2023-10-08 14:40:02 发布 · 2.2k 阅读

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CC 4.0 BY-SA版权

文章标签：

#iOS

本文介绍如何将UIView转换为UIImage，并提供了两种方法来为图片添加水印：使用另一张图片作为水印和使用文字作为水印。通过具体的Objective-C代码实现，帮助开发者快速掌握相关技巧。

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view转image

+(UIImage*)getImageFromView:(UIView*)theView{

    UIGraphicsBeginImageContextWithOptions(theView.bounds.size, NO, 0.0);

    [theView.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndPDFContext();
    return newImage;

}

给图片添加图片水印

+ (UIImage *)WaterImageWithImage:(UIImage *)image waterImage:(UIImage *)waterImage waterImageRect:(CGRect)rect{

    //1.获取图片

    //2.开启上下文
    UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
    //3.绘制背景图片
    [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
    //绘制水印图片到当前上下文
    [waterImage drawInRect:rect];
    //4.从上下文中获取新图片
    UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
    //5.关闭图形上下文
    UIGraphicsEndImageContext();
    //返回图片
    return newImage;
}

//添加文字水印

+(UIImage *)WaterImageWithImage:(UIImage *)image text:(nullable NSString *)text textPoint:(CGPoint)point text2:(NSString * _Nonnull)text2 textpoint2:(CGPoint)point2 attributedString:(nullable NSDictionary<NSString *,id> *)attributed{
    //1.开启上下文
    UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
    //2.绘制图片
    [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
    //添加水印文字
    [text drawAtPoint:point withAttributes:attributed];

    [text2 drawAtPoint:point2 withAttributes:attributed];
    //3.从上下文中获取新图片
    UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
    //4.关闭图形上下文
    UIGraphicsEndImageContext();
    //返回图片
    return newImage;
}
推荐一篇比较全的文章：https://www.jianshu.com/p/4e22c6ac114d