ios - 从 UIImageView 创建 UIImage

Question

我创建了一个 UIImageView有两个 UILabel作为它的 subview :

 UIImageView *img=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, [[UIScreen mainScreen] bounds].size.height)];
    img.backgroundColor=self.view.backgroundColor;

    UILabel *textOne=[[UILabel alloc]initWithFrame:CGRectMake(10, 10, 290, 250)];
    textOne.text=_textOneLabel.text;
    textOne.textColor=_textOneLabel.textColor;

    UILabel *textTwo = [[UILabel alloc] initWithFrame:CGRectMake(100,180,200,100)];
    textTwo.text=_textTwoLabel.text;
    textTwo.textColor=_textTwoLabel.textColor;

    [img addSubview:textOne];
    [img addSubview:textTwo];

    UIImageWriteToSavedPhotosAlbum(img.image, nil, nil, nil); //img.image is null

我想创建一个 UIImage用 UIImageView 将其保存在相机胶卷中和 2 创建 UILabel . img.image返回 null 因为没有分配给 UIImageView 的图像.
您知道如何实现这一目标吗？

Answer 1

使用以下方法将您的 UIImageView 转换为 UIImage。

UIImage *image = [self ChangeImageViewToImage:img];

//方法

-(UIImage *) ChangeImageViewToImage : (UIImageView *) view{

 UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
 [view.layer renderInContext:UIGraphicsGetCurrentContext()];

 UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

 UIGraphicsEndImageContext();

 return img;

}