文字与图片

UIImage *image = self.showedImageView.image;  ／／获取一张图片

UIGraphicsBeginImageContext(image.size);  ／／开启上下文

[image drawInRect:CGRectMake(0, 0, w, h)];  ／／图片绘画

NSDictionary *attr = @{NSFontAttributeName:[UIFont monospacedDigitSystemFontOfSize:268 weight:10],NSForegroundColorAttributeName:[UIColor redColor],NSStrokeColorAttributeName:[UIColor lightGrayColor]};

 [mark drawInRect:CGRectMake(110, 80, w, h) withAttributes:attr];／／ 文字绘制

UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();／／ 获取到新绘制的图片

UIGraphicsEndImageContext();  ／／ 关闭上下文

图片与图片

    UIGraphicsBeginImageContextWithOptions(useImage.size, NO, 0.0);

    [useImage drawInRect:CGRectMake(0, 0, useImage.size.width, useImage.size.height)]; ／／背景图片

    [maskImage drawInRect:CGRectMake(0, 0, useImage.size.width/2, useImage.size.height/2)];

    UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

文字和图片重绘到一张图片／图片和图片重绘到一张图片