+ (instancetype)waterMarkWithImage:(UIImage *)image andMarkImageName:(NSString *)markName{
UIImage *watermarkImage = [UIImage imageNamed:markName];
if (!watermarkImage) {
NSLog(@"水印图片加载失败: %@", markName);
return image;
}
// 获取原图尺寸和方向
CGSize originalSize = image.size;
BOOL isLandscape = originalSize.width > originalSize.height;
// 根据图片方向设置不同的水印比例
CGFloat watermarkRatio;
if (isLandscape) {
watermarkRatio = 0.04; // 横图水印比例
} else {
watermarkRatio = 0.06; // 竖图水印比例
}
CGFloat targetWidth = originalSize.width * watermarkRatio;
CGFloat scaleFactor = targetWidth / watermarkImage.size.width;
CGFloat watermarkWidth = watermarkImage.size.width * scaleFactor;
CGFloat watermarkHeight = watermarkImage.size.height * scaleFactor;
// 根据方向设置不同的边距
CGFloat marginX, marginY;
if (isLandscape) {
marginX = originalSize.width * 0.02;
marginY = originalSize.height * 0.02;
} else {
marginX = originalSize.width * 0.03;
marginY = originalSize.height * 0.03;
}
// 创建图像上下文并绘制水印
UIGraphicsBeginImageContextWithOptions(originalSize, NO, 0);
[image drawInRect:CGRectMake(0, 0, originalSize.width, originalSize.height)];
CGRect watermarkRect = CGRectMake(13,
marginY-20,
watermarkWidth,
watermarkHeight);
[watermarkImage drawInRect:watermarkRect blendMode:kCGBlendModeNormal alpha:1.0];
UIImage *watermarkedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return watermarkedImage;
}
