解决问题：将两个图像拼接在一起

前提：需要添加Framework：CoreGraphics.framework

源码：

- (UIImage *) combine:(UIImage*)leftImage :(UIImage*)rightImage {
    CGFloat width = leftImage.size.width * 2;
    CGFloat height = leftImage.size.height;
    CGSize offScreenSize = CGSizeMake(width, height);
    
    UIGraphicsBeginImageContext(offScreenSize);
    
    CGRect rect = CGRectMake(0, 0, width/2, height);
    [leftImage drawInRect:rect];
    
    rect.origin.x += width/2;
    [rightImage drawInRect:rect];
    
    UIImage* imagez = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
    return imagez;
}