以编程方式在iOS中捕获状态栏的完整屏幕截图

时间:2011-12-14 16:55:25

标签: objective-c ios uiwindow uiscreen

我正在使用此代码捕获屏幕截图并将其保存到相册中。

-(void)TakeScreenshotAndSaveToPhotoAlbum
{
   UIWindow *window = [UIApplication sharedApplication].keyWindow;

   if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
       UIGraphicsBeginImageContextWithOptions(window.bounds.size, NO, [UIScreen mainScreen].scale);
   else
       UIGraphicsBeginImageContext(window.bounds.size);

   [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
   UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();

   UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}

但问题是无论何时保存屏幕截图,我都看不到iPhone的状态栏。相反,底部会出现一个空白区域。如下图所示: enter image description here

我做错了什么?

7 个答案:

答案 0 :(得分:18)

状态栏实际上位于自己的UIWindow中,在您的代码中,您只渲染viewcontroller的视图,而不包含此视图。

“官方”屏幕截图方法是here,但现在似乎已被Apple删除,可能是因为它已过时。

在iOS 7下,UIScreen上有一个新方法,用于获取包含整个屏幕内容的视图:

- (UIView *)snapshotViewAfterScreenUpdates:(BOOL)afterUpdates

这将为您提供一个视图,然后您可以在屏幕上操作各种视觉效果。

如果要将视图层次结构绘制到上下文中,则需要遍历应用程序的窗口([[UIApplication sharedApplication] windows])并在每个窗口上调用此方法:

- (BOOL)drawViewHierarchyInRect:(CGRect)rect afterScreenUpdates:(BOOL)afterUpdates

可能能够结合上述两种方法并拍摄快照视图,然后在快照上使用上述方法绘制它。

答案 1 :(得分:7)

建议的“官方”屏幕截图方法不捕获状态栏(它不在应用程序的Windows列表中)。在iOS 5上测试过。

我相信,这是出于安全原因,但在文档中没有提到它。

我建议两个选择:

  • 从应用资源中绘制存根状态栏图像(可选择更新时间指示符);
  • 仅捕获您的视图,没有状态栏,或之后修剪图像(图像大小将与标准设备分辨率不同);状态栏框架从应用程序对象的相应属性中已知。

答案 2 :(得分:6)

这是我的代码,用于截取屏幕截图并将其存储为NSData(在IBAction中)。使用sotred NSData,您可以共享或发送电子邮件或任何想要做的事情

CGSize imageSize = [[UIScreen mainScreen] bounds].size;
        if (NULL != UIGraphicsBeginImageContextWithOptions)
            UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
        else
            UIGraphicsBeginImageContext(imageSize);

        CGContextRef context = UIGraphicsGetCurrentContext();

        // Iterate over every window from back to front
        for (UIWindow *window in [[UIApplication sharedApplication] windows])
        {
            if (![window respondsToSelector:@selector(screen)] || [window screen] == [UIScreen mainScreen])
            {
                // -renderInContext: renders in the coordinate space of the layer,
                // so we must first apply the layer's geometry to the graphics context
                CGContextSaveGState(context);
                // Center the context around the window's anchor point
                CGContextTranslateCTM(context, [window center].x, [window center].y);
                // Apply the window's transform about the anchor point
                CGContextConcatCTM(context, [window transform]);
                // Offset by the portion of the bounds left of and above the anchor point
                CGContextTranslateCTM(context,
                                      -[window bounds].size.width * [[window layer] anchorPoint].x,
                                      -[window bounds].size.height * [[window layer] anchorPoint].y);

                // Render the layer hierarchy to the current context
                [[window layer] renderInContext:context];

                // Restore the context
                CGContextRestoreGState(context);
            }
        }

        // Retrieve the screenshot image
        UIImage *imageForEmail = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();

    NSData *imageDataForEmail = UIImageJPEGRepresentation(imageForEmail, 1.0);

答案 3 :(得分:1)

function error(value) { if (console) { console.error(value) } } 的上述问题的答案已经写在那里,以下是上述问题的Objective-C版本答案。

适用于Swift 3 +

截取屏幕截图,然后使用它在某处显示或通过网络发送。

Swift

使用上述截图

  • 让我们在UIImageView上显示屏幕截图

    extension UIImage {
        class var screenShot: UIImage? {
            let imageSize = UIScreen.main.bounds.size as CGSize;
            UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
            guard let context = UIGraphicsGetCurrentContext() else {return nil}
            for obj : AnyObject in UIApplication.shared.windows {
                if let window = obj as? UIWindow {
                    if window.responds(to: #selector(getter: UIWindow.screen)) || window.screen == UIScreen.main {
                        // so we must first apply the layer's geometry to the graphics context
                        context.saveGState();
                        // Center the context around the window's anchor point
                        context.translateBy(x: window.center.x, y: window.center
                            .y);
                        // Apply the window's transform about the anchor point
                        context.concatenate(window.transform);
                        // Offset by the portion of the bounds left of and above the anchor point
                        context.translateBy(x: -window.bounds.size.width * window.layer.anchorPoint.x,
                                             y: -window.bounds.size.height * window.layer.anchorPoint.y);
    
                        // Render the layer hierarchy to the current context
                        window.layer.render(in: context)
    
                        // Restore the context
                        context.restoreGState();
                    }
                }
            }
            guard let image = UIGraphicsGetImageFromCurrentImageContext() else {return nil}
            return image
        }
    }
    
  • 获取图像数据以通过网络保存/发送

    yourImageView = UIImage.screenShot
    

答案 4 :(得分:1)

Swift,iOS 13:

下面的代码(以及其他访问方式)现在将使应用程序崩溃并显示一条消息:

  

在UIApplication上名为-statusBar或-statusBarWindow的应用程序:必须更改此代码,因为不再有状态栏或状态栏窗口。而是在窗口场景上使用statusBarManager对象。

窗口场景和statusBarManager确实仅使我们能够访问框架-如果仍然可行,我不知道怎么做。

Swift,iOS10-12:

以下内容适用于我,并且介绍了用于捕获程序化屏幕截图的所有方法后,这是最快的也是推荐的iOS 10之后Apple推荐的方式

let screenshotSize = CGSize(width: UIScreen.main.bounds.width * 0.6, height: UIScreen.main.bounds.height * 0.6)
let renderer = UIGraphicsImageRenderer(size: screenshotSize)
let statusBar = UIApplication.shared.value(forKey: "statusBarWindow") as? UIWindow
let screenshot = renderer.image { _ in
    UIApplication.shared.keyWindow?.drawHierarchy(in: CGRect(origin: .zero, size: screenshotSize), afterScreenUpdates: true)
    statusBar?.drawHierarchy(in: CGRect(origin: .zero, size: screenshotSize), afterScreenUpdates: true)
}

您不必缩小屏幕截图的大小(如果需要,可以直接使用UIScreen.main.bounds

答案 5 :(得分:0)

以下适用于我,捕获状态栏正常(iOS 9,Swift)

let screen = UIScreen.mainScreen()
let snapshotView = screen.snapshotViewAfterScreenUpdates(true)
UIGraphicsBeginImageContextWithOptions(snapshotView.bounds.size, true, 0)
snapshotView.drawViewHierarchyInRect(snapshotView.bounds, afterScreenUpdates: true)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

答案 6 :(得分:0)

捕获iPhone的全屏,使用KVC获取状态栏:

if let snapView = window.snapshotView(afterScreenUpdates: false) {
    if let statusBarSnapView = (UIApplication.shared.value(forKey: "statusBar") as? UIView)?.snapshotView(afterScreenUpdates: false) {
        snapView.addSubview(statusBarSnapView)
    }
    UIGraphicsBeginImageContextWithOptions(snapView.bounds.size, true, 0)
    snapView.drawHierarchy(in: snapView.bounds, afterScreenUpdates: true)
    let snapImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
}