如何在iOS中以編程方式截圖？

Question

我同時使用UIKit控制和OpenGL一個UIView。我想以編程方式獲得該視圖的截圖。

如果我使用UIGraphicsGetImageFromCurrentImageContext()，在OpenGL內容是空白的; 如果我使用glReadPixels(...)方法，則UIKit內容爲空;

我很困惑，如何把一個完整的屏幕截圖。 謝謝！

Answer 1

這裏是你如何利用一個簡單的截圖編程方式UIImage的。如果你想讓它用於任何其他物體，用它代替UIImage。

在.h文件添加NSData *Data;然後在.m文件添加到您的代碼

UIGraphicsBeginImageContext(self.view.frame.size); 
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; 
UIImage *attachimage = [[UIImage alloc]initWithData:Data]; 
UIImage *viImage=UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 
attachimage = viImage; 
UIImageWriteToSavedPhotosAlbum(viImage, nil, nil, nil); 

Answer 2

你得到結果的UIImage沒有圖像丟失質量

- (UIImage *)captureView:(UIView *)view { 
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0); 
    [view.layer renderInContext:UIGraphicsGetCurrentContext()]; 
    UIImage * img = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 
    return img; 
    } 

Answer 3

UIGraphicsBeginImageContext(self.view.bounds.size); 
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; 
UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 
NSData *data = [UIImagePNGRepresentation(image) retain]; 
UImage *screenShot = [UIImage imageWithData:data]; 

Answer 4

你知道在哪裏OpenGL內容位於您的視圖中。所以應該很容易將glReadPixels的結果複製到UIKit的快照中。

Answer 5

也許...你使用的東西從這裏

- https://stackoverflow.com/questions/12413460/cocos2d-2-0-screenshots-on-ios-6

這裏......

Why is glReadPixels() failing in this code in iOS 6.0?

Answer 6

使用下面的代碼採取截屏

-(UIImage *) screenshot 
    { 

      CGRect rect; 
      rect=CGRectMake(0, 0, 320, 480); 
      UIGraphicsBeginImageContext(rect.size); 

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

      UIImage *image=UIGraphicsGetImageFromCurrentImageContext(); 
      UIGraphicsEndImageContext(); 

      return image; 
    } 

Answer 7

那麼，捕捉iPho的方法很少NE屏幕編程

1. 使用UIKit的http://developer.apple.com/library/ios/#qa/qa1703/_index.html

2. 使用AVFoundation框架http://developer.apple.com/library/ios/#qa/qa1702/_index.html

3. 利用OpenGL ES http://developer.apple.com/library/ios/#qa/qa1704/_index.html

4. 從iOS的7起，您還可以使用Why does my programmatically created screenshot look so bad on iOS 7?

5. 使用的UIWindow

   CGRect screenRect = [[UIScreen mainScreen] bounds]; 
   UIGraphicsBeginImageContext(screenRect.size); 
   CGContextRef ctx = UIGraphicsGetCurrentContext(); 
   [[UIColor blackColor] set]; 
   CGContextFillRect(ctx, screenRect); 
   [self.window.layer renderInContext:ctx]; 
   UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); 
   UIGraphicsEndImageContext(); 
   

6. 使用的UIView

   UIGraphicsBeginImageContext(self.view.frame.size); 
   [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; 
   UIImage *viImage=UIGraphicsGetImageFromCurrentImageContext(); 
   UIGraphicsEndImageContext(); 
   

出的這6個選項，我找到了第一個選項的複製粘貼和施加壓力的級別爲第方法非常方便給圖像提供真實的像素數據。我也喜歡選項4，因爲API帶有SDK。

Answer 8

-(UIImage *) screenshot 
{ 
CGImageRef UIGetScreenImage(void); 
CGImageRef screen = UIGetScreenImage(); 
UIImage* screenImage = [UIImage imageWithCGImage:screen]; 
CGImageRelease(screen); // you need to call this. 
return screenImage; 
}