iOS---将两张照片合并为一张照片

- (UIImage*)addImage:(UIImage*)image1 toImage:(UIImage*)image2

{

    //将底部的一张的大小作为所截取的合成图的尺寸

     UIGraphicsBeginImageContext(CGSizeMake(image2.size.width, image2.size.height+image1.size.height));

    // Draw image2，底下的

    [image2drawInRect:CGRectMake(0, 0, image2.size.width, image2.size.height)];

    [image1drawInRect:CGRectMake(0,image2.size.height, image1.size.width, image1.size.height)];

    UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    returnresultingImage;

}