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  • 保存图片至相册

        //创建图形上下文
        UIGraphicsBeginImageContext(CGSizeMake(200, 200));
        CGContextRef context = UIGraphicsGetCurrentContext();
        UIImage *image = [UIImage imageNamed:@"1.png"];
        [image drawInRect:CGRectMake(0, 0, 200, 200)];
        
        //添加水印
        NSString *str = @"我的图片";
        [str drawInRect:CGRectMake(10, 10, 20, 180) withAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:16],NSForegroundColorAttributeName:[UIColor redColor]}];
        //从当前图形上下文获取图片(将当前图形上下文转成图片)
        UIImage *changeImage = UIGraphicsGetImageFromCurrentImageContext();
        //释放内存
        CGContextRelease(context);
        //释放内存
        UIGraphicsEndImageContext();
        
        NSLog(@"%f",UIImagePNGRepresentation(changeImage).length/1024.f);
        UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, changeImage.size.width, changeImage.size.height)];
        imageView.image = changeImage;
        [self.view addSubview:imageView];
        //保存到相册(需要传入回调方法,回调方法格式有要求)
        UIImageWriteToSavedPhotosAlbum(changeImage, self, @selector(image:error:contextInfo:), nil);
    
    - (void)image:(UIImage *)image error:(NSError *)error contextInfo:(CGContextRef)context
    {
        if (error) {
            NSLog(@"保存失败!");
        }
        else
        {
            NSLog(@"保存成功!");
        }
    }
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  • 原文地址:https://www.cnblogs.com/liaods/p/4805514.html
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