从UIImageView创建UIImage [英] Create UIImage from a UIImageView

问题描述

我用两个 UILabel 创建一个 UIImageView 作为它的子视图：

I create a UIImageView with two UILabel as subviews of it:

 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 UIImage 使用 UIImageView 和2创建的 UILabel 将其保存在相机胶卷中。 img.image 返回null，因为没有图像分配给 UIImageView 。

你知道如何实现这个目标吗？

I want to create a UIImage to save it in the camera roll with the UIImageView and the 2 created UILabel. img.image returns null because there is no image assigned to the UIImageView.
Do you have an idea of how achieving that?

推荐答案

使用以下方法将你的UIImageView转换为UIImage。

Use below method to convert your UIImageView to 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;

}

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