如何捕获 UIView 顶部 UIView [英] Howe to capture UIView top UIView

问题描述

我有 UIView 显示图形..现在我需要将它捕获到 UIImage 并且我用谷歌搜索它并得到以下代码.但是如果我使用它在我的代码中它不起作用.即使我使用断点编译器也无法达到此目的.我在我的 UIView 中使用它.我哪里出错了?

i have UIView which displays the Graph..now I need to capture it to the UIImage and I googled it and got the below code.but if i use this in my code its not work.even if I use breakpoint compiler does not reach to this.I am using this in my UIView .where I am going wrong?

+ (UIImage *) imageWithView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;
} 

推荐答案

您可以使用以下方法对iPhone应用程序的任何视图或整个屏幕进行截图

You can take a screenshot of any view or whole screen of the iPhone app with below method

- (UIImage *)captureView {

//hide controls if needed
CGRect rect = [self.view bounds];

    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [self.view.layer renderInContext:context];   
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;

}

然后像下面这样称呼它...

And call it like bellow...

UIImage *tempImageSave=[self captureView];

你也可以用这个波纹管保存这张图片作为相册..

and you can also save this image with this bellow line for photo album..

UIImageWriteToSavedPhotosAlbum(tempImageSave,nil,nil,nil);

您还可以使用此波纹管将此图像保存为文档目录..

and you can also save this image with this bellow line for Document Directory..

NSData *imageData = UIImagePNGRepresentation(tempImageSave);
NSFileManager *fileMan = [NSFileManager defaultManager];

NSString *fileName = [NSString stringWithFormat:@"%d.png",1];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pdfFileName = [documentsDirectory stringByAppendingPathComponent:fileName];
[fileMan createFileAtPath:pdfFileName contents:imageData attributes:nil];

如果视图包含图层图像或一些与图形相关的数据，则使用以下方法.

If the view contains the layer images or some graphics related data then use below method.

-(UIImage *)convertViewToImage:(UIView *)viewTemp
{
    UIGraphicsBeginImageContext(viewTemp.bounds.size);
    [viewTemp drawViewHierarchyInRect:viewTemp.bounds afterScreenUpdates:YES];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;

}

并使用如下方法.

UIImage *tempImageSave = [self convertViewToImage:yourView];

希望对你有帮助.

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