iOS 截屏功能代码

   大家都知道通过同时按iphone和ipad关机键和home键可以进行截图，也可以通过代码编程进行对屏幕的截图。

使用opengles截图并保存代码：

相关连接

-(UIImage *) glToUIImage {    NSInteger myDataLength = 1024 * 768 * 4;        // allocate array and read pixels into it.    GLubyte *buffer = (GLubyte *) malloc(myDataLength);    glReadPixels(0, 0, 1024, 768, GL_RGBA, GL_UNSIGNED_BYTE, buffer);        // gl renders "upside down" so swap top to bottom into new array.    // there's gotta be a better way, but this works.    GLubyte *buffer2 = (GLubyte *) malloc(myDataLength);    for(int y = 0; y <768; y++)    {        for(int x = 0; x <1024 * 4; x++)        {            buffer2[(767 - y) * 1024 * 4 + x] = buffer[y * 4 * 1024 + x];        }    }        // make data provider with data.    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, buffer2, myDataLength, NULL);        // prep the ingredients    int bitsPerComponent = 8;    int bitsPerPixel = 32;    int bytesPerRow = 4 * 1024;    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();    CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;    CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;        // make the cgimage    CGImageRef imageRef = CGImageCreate(1024, 768, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);        // then make the uiimage from that    UIImage *myImage = [UIImage imageWithCGImage:imageRef];    return myImage;}-(void)captureToPhotoAlbum {    UIImage *image = [self glToUIImage];    UIImageWriteToSavedPhotosAlbum(image, self, nil, nil);}

使用苹果官网截图并保存

相关连接

-(void)ScreenShots{    [self unschedule:@selector(ScreenShots)];        CGSize imageSize = [[UIScreen mainScreen] bounds].size;    if (NULL != UIGraphicsBeginImageContextWithOptions) {        UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);    }    else    {        UIGraphicsBeginImageContext(imageSize);    }        CGContextRef context = UIGraphicsGetCurrentContext();        for (UIWindow * window in [[UIApplication sharedApplication] windows]) {        if (![window respondsToSelector:@selector(screen)] || [window screen] == [UIScreen mainScreen]) {            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);            [[window layer] renderInContext:context];                        CGContextRestoreGState(context);        }    }        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();    NSThread *thread=[[NSThread alloc] initWithTarget:self selector:@selector(saveThread:) object:image];    [thread start];    [thread release];      NSLog(@"Suceeded!");}-(void)saveThread:(UIImage*)image{    NSAutoreleasePool *pool=[[NSAutoreleasePool alloc]init];    UIImageWriteToSavedPhotosAlbum(image, self, nil, nil);    [pool release];}