IOS 两个UIImage 合成一个Image

    UIImage *image1 = [UIImage imageNamed:@"p1"];
    UIImage *image2 = [UIImage imageNamed:@"p2"];
    CGSize size = CGSizeMake([UIScreen mainScreen].bounds.size.width,[UIScreen mainScreen].bounds.size.height);
    UIGraphicsBeginImageContext(size);
    [image1 drawInRect:CGRectMake(0, 0, image1.size.width,64)];
    [image2 drawInRect:CGRectMake(0, 64, [UIScreen mainScreen].bounds.size.width,[UIScreen mainScreen].bounds.size.height-64)];
    UIImage *ZImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    UIImageView *imageV = [[UIImageView alloc]init];
    imageV.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height);
    imageV.image = ZImage;
    [self.view addSubview:imageV];