监听手机截屏事件
Posted Cocos2der
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了监听手机截屏事件相关的知识,希望对你有一定的参考价值。
猴子原创,欢迎转载。转载请注明: 转载自Cocos2Der-CSDN,谢谢!
原文地址: http://blog.csdn.net/cocos2der/article/details/51780954
今天无意中在百度地图中截屏路线的时候,顶部出现提示我的截屏信息。这细节挺好的,省去我后面需要使用该截屏的繁琐步骤。刚好手头空闲会,我也写个玩玩。哈哈哈~~
截屏在ios7以前是需要使用小技巧来获取用户截屏事件的,iOS7之后,apple开放了用户截屏通知事件,所以现在做起来还是挺方便的。
// This notification is posted after the user takes a screenshot (for example by pressing both the home and lock screen buttons)
@available(iOS 7.0, *)
public let UIApplicationUserDidTakeScreenshotNotification: String
注册通知
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.userDidTakeScreenshot), name: UIApplicationUserDidTakeScreenshotNotification, object: nil)
代码实现(swift)
/// 用户截屏完毕
func userDidTakeScreenshot()
// 当前屏幕的image
// 注意:为什么不直接从相册读取截屏图像
//(万一用户直接拒绝可权限你不跪了,何况截屏之后,用户可不知道你会提示,第一反应肯定拒绝读取相册的权限)
let image = imageWithScreenshot()
let imageView = UIImageView(frame: CGRect(x: 50, y: 50, width: 320, height: 640))
imageView.image = image
self.view.addSubview(imageView)
/// 获取当前屏幕图片
func imageWithScreenshot() -> UIImage?
let imageData = dataWithScreenshotInPNGFormat()
return UIImage(data: imageData)
/// 截取当前屏幕
func dataWithScreenshotInPNGFormat() -> NSData
var imageSize = CGSizeZero
let screenSize = UIScreen.mainScreen().bounds.size
let orientation = UIApplication.sharedApplication().statusBarOrientation
if UIInterfaceOrientationIsPortrait(orientation)
imageSize = screenSize
else
imageSize = CGSizeMake(screenSize.height, screenSize.width)
UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
let context = UIGraphicsGetCurrentContext()
for window in UIApplication.sharedApplication().windows
CGContextSaveGState(context)
CGContextTranslateCTM(context, window.center.x, window.center.y)
CGContextConcatCTM(context, window.transform)
CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y)
if orientation == UIInterfaceOrientation.LandscapeLeft
CGContextRotateCTM(context, CGFloat(M_PI_2))
CGContextTranslateCTM(context, 0, -imageSize.width)
else if orientation == UIInterfaceOrientation.LandscapeRight
CGContextRotateCTM(context, -CGFloat(M_PI_2))
CGContextTranslateCTM(context, -imageSize.height, 0)
else if (orientation == UIInterfaceOrientation.PortraitUpsideDown)
CGContextRotateCTM(context, CGFloat(M_PI))
CGContextTranslateCTM(context, -imageSize.width, -imageSize.height)
if window.respondsToSelector(#selector(UIView.drawViewHierarchyInRect(_:afterScreenUpdates:)))
window.drawViewHierarchyInRect(window.bounds, afterScreenUpdates: true)
else
window.layer.renderInContext(context!)
CGContextRestoreGState(context);
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return UIImagePNGRepresentation(image)!
注意:为什么不直接从相册读取截屏图像?
万一用户直接拒绝可权限你不跪了,何况截屏之后,用户可不知道你会提示,第一反应肯定拒绝读取相册的权限。
以上是关于监听手机截屏事件的主要内容,如果未能解决你的问题,请参考以下文章