是否可以在目标C中使用屏幕截图并将其存储在UIImage中。如何以编程方式拍摄iPhone的截图?
回答
你需要创建你的屏幕大小的位图上下文和使用
[self.view.layer renderInContext:c]
复制你的看法在它的链接。一旦完成,您可以使用
CGBitmapContextCreateImage(c)
从您的上下文创建CGImage。
阐述:
CGSize screenSize = [[UIScreen mainScreen] applicationFrame].size;
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(nil, screenSize.width, screenSize.height, 8, 4*(int)screenSize.width, colorSpaceRef, kCGImageAlphaPremultipliedLast);
CGContextTranslateCTM(ctx, 0.0, screenSize.height);
CGContextScaleCTM(ctx, 1.0, -1.0);
[(CALayer*)self.view.layer renderInContext:ctx];
CGImageRef cgImage = CGBitmapContextCreateImage(ctx);
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
CGContextRelease(ctx);
[UIImageJPEGRepresentation(image, 1.0) writeToFile:@"screen.jpg" atomically:NO];
请注意,如果您在响应点击一个UIButton运行你的代码,你的图像将显示,按下按钮。
是的,这里的苹果开发者论坛 https://devforums.apple.com/message/149553
前面的代码假设要捕获的视图位于主屏幕上......它可能不是。
这个工作是否总是捕获主窗口的内容? (警告:在StackOverflow上编译)
- (UIImage *) captureScreen {
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
CGRect rect = [keyWindow bounds];
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[keyWindow.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
技术问答&一个QA1703 UIKit中的应用 屏幕捕捉
http://developer.apple.com/iphone/library/qa/qa2010/qa1703.html
谢谢。+ 1为苹果资源。 – 2012-03-27 17:38:14
试试这个...
- (UIImage*)captureView:(UIView *)view
{
CGRect rect = [[UIScreen mainScreen] bounds];
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[view.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
- (void)saveScreenshotToPhotosAlbum:(UIView *)view
{
UIImageWriteToSavedPhotosAlbum([self captureView:self.view], nil, nil,nil);
}
使用此代码截图:
-(void)webViewDidFinishLoad:(UIWebView *)webView
{
UIGraphicsBeginImageContext(self.webView.bounds.size);
[self.webView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenshotImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(screenshotImage, nil, nil, nil);
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *str1=[NSString stringWithFormat:@"%d",myInt];
NSString *pngFilePath = [NSString stringWithFormat:@"%@/page_%@.png",docDir,str1]; // any name u want for image
NSLog(@"%@",pngFilePath);
NSData *data1 = [NSData dataWithData:UIImagePNGRepresentation(screenshotImage)];
[data1 writeToFile:pngFilePath atomically:YES];
}
UIGraphicsBeginImageContext(self.window.bounds.size);
[self.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData * data = UIImagePNGRepresentation(image);
[data writeToFile:@"foo.png" atomically:YES];
UPDATE 2011年4月:视网膜显示屏,将第一行到这一点:
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
{
UIGraphicsBeginImageContextWithOptions(self.window.bounds.size, NO, [UIScreen mainScreen].scale);
}
else
{
UIGraphicsBeginImageContext(self.window.bounds.size);
}
- (void)SnapShot {
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, [UIScreen mainScreen].scale);
} else {
UIGraphicsBeginImageContext(self.view.bounds.size);
}
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *data = UIImagePNGRepresentation(image);
[data writeToFile:@"snapshot.png" options:NSDataWritingWithoutOverwriting error:Nil];
[data writeToFile:@"snapshot.png" atomically:YES];
UIImageWriteToSavedPhotosAlbum([UIImage imageWithData:data], nil, nil, nil);
}
它是100%在我的程序工作,为什么投票下来。?! – 2013-12-30 07:04:38
// 100%工作
- (UIImage *)screenshot
{
UIGraphicsBeginImageContextWithOptions(self.main_uiview.bounds.size, NO, 2.0f);
[self.main_uiview drawViewHierarchyInRect:_main_uiview.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
@dhaya的答案正在为我工作,但不要忘记更新库中保存图像的“Info.plist”设置。 需要在“Info.plist”文件中添加此代码以将照片图像保存到照片库。的
<key>NSPhotoLibraryAddUsageDescription</key>
<string>NeedLibrary access for save Images on Album</string>
可能重复http://stackoverflow.com/questions/2214957/how-do-i-take-a-screen-shot-of-a-uiview – 2010-08-31 15:35:16
可能重复[如何采取截图编程](http://stackoverflow.com/questions/2200736/how-to-take-a-screenshot-programmatically) – 2010-09-01 16:03:54