图片上添加水印图片之后合成

-(void) FeSlideFilterView:(FeSlideFilterView *)sender didTapDoneButtonAtIndex:(NSInteger)index

{

[self dismissViewControllerAnimated:YES completion:^{

[[UIApplication sharedApplication] setStatusBarHidden:NO];

UIGraphicsBeginImageContext(self.filterImage.size);

[self.filterImage drawInRect:CGRectMake(0, 0, self.filterImage.size.width, self.filterImage.size.height)];
//四个参数为水印图片的位置
[signImage.image drawInRect:CGRectMake(self.currentPoint.x, self.currentPoint.y, signImage.image.size.width, signImage.image.size.height)];

UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

[deletate imageBeautifulDone:resultingImage];

}];

NSLog(@"did tap at index = %ld",(long)index);
}