图片水印 #截屏 #图片加文字 #图片加水印

图片水印.m

截屏
  UIGraphicsBeginImageContextWithOptions(pageView.page.bounds.size, YES, zoomScale);
        [pageView.page.layer renderInContext:UIGraphicsGetCurrentContext()];
        UIImage *uiImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

图片加文字
-(UIImage *)addText:(UIImage *)img text:(NSString *)text1   
{   
//上下文的大小   
int w = img.size.width;   
int h = img.size.height;   
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();//创建颜色   
//创建上下文   
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 44 * w, colorSpace, kCGImageAlphaPremultipliedFirst);   
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);//将img绘至context上下文中   
CGContextSetRGBFillColor(context, 0.0, 1.0, 1.0, 1);//设置颜色   
char* text = (charchar *)[text1 cStringUsingEncoding:NSASCIIStringEncoding];   
CGContextSelectFont(context, "Georgia", 30, kCGEncodingMacRoman);//设置字体的大小   
CGContextSetTextDrawingMode(context, kCGTextFill);//设置字体绘制方式   
CGContextSetRGBFillColor(context, 255, 0, 0, 1);//设置字体绘制的颜色   
CGContextShowTextAtPoint(context, w/2-strlen(text)*5, h/2, text, strlen(text));//设置字体绘制的位置   
//Create image ref from the context   
CGImageRef imageMasked = CGBitmapContextCreateImage(context);//创建CGImage   
CGContextRelease(context);   
CGColorSpaceRelease(colorSpace);   
return [UIImage imageWithCGImage:imageMasked];//获得添加水印后的图片   
}  


水印

-(UIImage *)addImageLogo:(UIImage *)img text:(UIImage *)logo   
{   
//get image width and height   
int w = img.size.width;   
int h = img.size.height;   
int logoWidth = logo.size.width;   
int logoHeight = logo.size.height;   
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();   
//create a graphic context with CGBitmapContextCreate   
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 44 * w, colorSpace, kCGImageAlphaPremultipliedFirst);   
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);   
CGContextDrawImage(context, CGRectMake(w-logoWidth, 0, logoWidth, logoHeight), [logo CGImage]);   
CGImageRef imageMasked = CGBitmapContextCreateImage(context);   
CGContextRelease(context);   
CGColorSpaceRelease(colorSpace);   
return [UIImage imageWithCGImage:imageMasked];   
// CGContextDrawImage(contextRef, CGRectMake(100, 50, 200, 80), [smallImg CGImage]);   
}