ios 加水印

1.加文字

 
-(UIImage *)addText:(UIImage *)img text:(NSString *)text1 
{     
     //get image width and height     
     int w = img.size.width;    
     int h = img.size.height;     
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();     
    //create a graphic context with CGBitmapContextCreate     
    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);    
    CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);     
    CGContextSetRGBFillColor(context, 0.0, 1.0, 1.0, 1);     
    char* text = (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding];     
    CGContextSelectFont(context, "Georgia", 30, kCGEncodingMacRoman);     
    CGContextSetTextDrawingMode(context, kCGTextFill);     
    CGContextSetRGBFillColor(context, 255, 0, 0, 1);     
    CGContextShowTextAtPoint(context, w/2-strlen(text)*5, h/2, text, strlen(text));     
    //Create image ref from the context     
    CGImageRef imageMasked = CGBitmapContextCreateImage(context);     
    CGContextRelease(context);     
    CGColorSpaceRelease(colorSpace);     
    return [UIImage imageWithCGImage:imageMasked]; 
}
 
2.加图片
-(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, 4 * 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]); 
}
 
3.加半透明的水印
- (UIImage *)addImage:(UIImage *)useImage addImage1:(UIImage *)addImage1
{       
    UIGraphicsBeginImageContext(useImage.size);            
    [useImage drawInRect:CGRectMake(0, 0, useImage.size.width, useImage.size.height)];          
    [addImage1 drawInRect:CGRectMake(0, useImage.size.height-addImage1.size.height, addImage1.size.width, addImage1.size.height)];         
    UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();      
    UIGraphicsEndImageContext();           
    return resultingImage;   
}

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