-(void)fullScreenshots{

UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];

    UIGraphicsBeginImageContext(screenWindow.frame.size);//全屏截图，包括window

    [screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

}

objective c 截屏代码

-(void)save{

UIGraphicsBeginImageContext(mybackgroundview.bounds.size); //currentView 当前的view

[mybackgroundview.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);  //保存到相册中

}截取 您想要的一层

UIGraphicsBeginImageContext(CGSizeMake(320, 300)); //currentView 当前的view

[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);  //保存到相册中

截取自定义的大小

iPhone开发应用中抓图程序案例实现是本文要介绍的内容，主要是通过代码来实现抓图程序，具体实现过程，一起来看详细代码。

1. //获得屏幕图像

2. - (UIImage *)imageFromView: (UIView *) theView

3. {

4. UIGraphicsBeginImageContext(theView.frame.size);

5. CGContextRef context = UIGraphicsGetCurrentContext();

6. [theView.layer renderInContext:context];

7. UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();

8. UIGraphicsEndImageContext();

9. return theImage;

10. }

11. //获得某个范围内的屏幕图像

12. - (UIImage *)imageFromView: (UIView *) theView   atFrame:(CGRect)r

13. {

14. UIGraphicsBeginImageContext(theView.frame.size);

15. CGContextRef context = UIGraphicsGetCurrentContext();

16. CGContextSaveGState(context);

17. UIRectClip(r);

18. [theView.layer renderInContext:context];

19. UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();

20. UIGraphicsEndImageContext();

21. return  theImage;//[self getImageAreaFromImage:theImage atFrame:r];

22. }