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/**
* 加文字随意@param logoImage 需要加文字的图片@param watemarkText 文字描述@returns 加好文字的图片
*/
- (UIImage *)addWatemarkTextAfteriOS7_WithLogoImage:(UIImage *)logoImage watemarkText:(NSString *)watemarkText{
int w = logoImage.size.width;
int h = logoImage.size.height;
UIGraphicsBeginImageContext(logoImage.size);
[[UIColor whiteColor] set];
[logoImage drawInRect:CGRectMake(0, 0, w, h)];
UIFont * font = [UIFont systemFontOfSize:18.0];
[watemarkText drawInRect:CGRectMake(10, 55, 130, 80) withAttributes:@{NSFontAttributeName:font,NSForegroundColorAttributeName:[UIColor whiteColor]}];
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
/**
* 加图片水印@param logoImage 需要加水印的logo图片@param watemarkImage 水印图片@returns 加好水印的图片
*/
- (UIImage *)addWatemarkImageWithLogoImage:(UIImage *)logoImage watemarkImage:(UIImage *)watemarkImage logoImageRect:(CGRect)logoImageRect watemarkImageRect:(CGRect)watemarkImageRect{
// 创建一个graphics context来画我们的东西
UIGraphicsBeginImageContext(logoImageRect.size);
// graphics context就像一张能让我们画上任何东西的纸。我们要做的第一件事就是把person画上去
[logoImage drawInRect:CGRectMake(0, 0, logoImageRect.size.width, logoImageRect.size.height)];
// 然后在把hat画在合适的位置
[watemarkImage drawInRect:CGRectMake(watemarkImageRect.origin.x, watemarkImageRect.origin.y, watemarkImageRect.size.width, watemarkImageRect.size.height)];
// 通过下面的语句创建新的UIImage
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
// 最后，我们必须得清理并关闭这个再也不需要的context
UIGraphicsEndImageContext();
return newImage;
}
/**
* 加半透明水印@param logoImage 需要加水印的图片@param translucentWatemarkImage 水印@returns 加好水印的图片
*/
- (UIImage *)addWatemarkImageWithLogoImage:(UIImage *)logoImage translucentWatemarkImage:(UIImage *)translucentWatemarkImage logoImageRect:(CGRect)logoImageRect translucentWatemarkImageRect:(CGRect)translucentWatemarkImageRect{
UIGraphicsBeginImageContext(logoImage.size);
[logoImage drawInRect:CGRectMake(0, 0, logoImage.size.width, logoImage.size.height)];
// 四个参数为水印的位置
[translucentWatemarkImage drawInRect:CGRectMake(logoImage.size.width - 110, logoImage.size.height - 25, 100, 25)];
UIImage * resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultingImage;
}
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