如何将UIView的一部分转换成UIImage并在imageView中显示

Question

我有一个视图，我正在绘制签名，我希望视图的签名部分应转换为UIImage，然后在UIImageView中显示它，这是我从网络获得的代码，我正在使用转换

    UIGraphicsBeginImageContext(signatureView.bounds.size);
   [signatureView.layer renderInContext:UIGraphicsGetCurrentContext()];
   UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
   logoImageView.image=img;
   UIGraphicsEndImageContext();

Answer 1

试试这个希望能帮到你。

 - (UIImage *) getUIImageWithmyView:(UImyView *)myView
    {
        UIGraphicsBeginImageContextWithOptions(myView.bounds.size, myView.opaque, 0.0);
        [myView.layer renderInContext:UIGraphicsGetCurrentContext()];
        UIImage * myImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return myImage;
    }

Answer 2

使用我的bellow方法…

- (UIImage *)captureView {
     //hide controls if needed
    CGRect rect = [signetureView bounds];//use your signature view's Rect means Frame;
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [self.view.layer renderInContext:context];   
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

你可以像下面这样调用上面的方法…

UIImage *tempImageSave=[self captureView];

Answer 3

try this:

  UIGraphicsBeginImageContext(signatureView.bounds.size);
  [signatureView.layer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  logoImageView.image=img;

first endimagecontext，然后在imageview中设置/使用该图像