IOS螢幕截圖—普通截圖

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分享一段螢幕的代碼，能夠普通的button，image，等。

對於截取網路攝影機的映像，比較複雜，因為網路攝影機是通過opengl渲染到view上面的，通過下面的代碼並不能截取。

就像我們遠程登入了另一台windows電腦時候，能看到對方的案頭等，但對方的視頻我們並不能看到。

關於截取opengl view的方法，我會在另一篇部落格中記錄： 

IOS螢幕---Opengl截屏

我已經在我的工程中測試過，可以使用

//普通螢幕截取

首先引入頭：

#include <QuartzCore/QuartzCore.h>

/**@view  the view you want to take screen shot*/-(UIImage*)getNormalImage:(UIView*)view{    UIGraphicsBeginImageContext(CGSizeMake(320,480));    CGContextRef context = UIGraphicsGetCurrentContext();    [view.layer renderInContext:context];    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}

//將UIIamge儲存到相簿中

//store the image to the iphone photo albumUIImage *image =nil;// init your imageUIImageWriteToSavedPhotosAlbum(image, self, nil, nil);

//儲存UIImage到本地磁碟，包括png和jpeg格式

//store the image to the app Document-(void)saveToDisk:(UIImage*) image{        NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];    // If you go to the folder below, you will find those picturesNSLog(@"%@",docDir);    NSLog(@"saving png");NSString *pngFilePath = [NSString stringWithFormat:@"%@/test%f.png",docDir,[NSDate timeIntervalSinceReferenceDate]];NSData *data1 = [NSData dataWithData:UIImagePNGRepresentation(image)];[data1 writeToFile:pngFilePath atomically:YES];    NSLog(@"saving jpeg");NSString *jpegFilePath = [NSString stringWithFormat:@"%@/test%f.jpeg",docDir,[NSDate timeIntervalSinceReferenceDate]];NSData *data2 = [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0f)];//1.0f = 100% quality[data2 writeToFile:jpegFilePath atomically:YES];    NSLog(@"saving image done");}

ref:

Download an Image and Save it as PNG or JPEG in iPhone SDK ‹ ObjectGraph Blog

iphone - Why do I get 'No -renderInContext: method found' warning? - Stack Overflow

iphone - Programmatically take a screenshot combining OpenGL and UIKit elements - Stack Overflow

iPhone – saving OpenGL ES content to the Photo Album | BIT-101

opengl es - Why is glReadPixels() failing in this code in iOS 6.0? - Stack Overflow