在 ios 7 中以编程方式截取屏幕截图答案

【问题标题】：taking screenshot programmaticallyin ios7在 ios 7 中以编程方式截取屏幕截图
【发布时间】：2023-03-19 07:36:01
【问题描述】：

这是我使用的代码

UIScreen *screen = [UIScreen mainScreen] ;
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
UIView *view = [screen snapshotViewAfterScreenUpdates:YES];
UIGraphicsBeginImageContextWithOptions(screen.bounds.size, NO, 0);
[keyWindow drawViewHierarchyInRect:keyWindow.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *data= UIImagePNGRepresentation(image);

然后我将数据发送到SLComposeViewController

 [mySLComposerSheet addImage:[UIImage imageWithData:data]];

一切都很好，但图像被旋转，我的应用程序仅处于横向模式但屏幕截图是垂直的

【问题讨论】：

标签： ios7 xcode5 sprite-kit

【解决方案1】：

这是因为你快照 UIWindow，它不像 UIView / UIViewController 那样处理旋转。你必须自己处理旋转。

试试这个代码：

- (UIImage *)makeSnapshot
{
    CGSize imageSize = CGSizeZero;

    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    if (UIInterfaceOrientationIsPortrait(orientation)) {
        imageSize = [UIScreen mainScreen].bounds.size;
    } else {
        imageSize = CGSizeMake([UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);
    }

    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    for (UIWindow *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 == UIInterfaceOrientationLandscapeLeft) {
            CGContextRotateCTM(context, M_PI_2);
            CGContextTranslateCTM(context, 0, -imageSize.width);
        } else if (orientation == UIInterfaceOrientationLandscapeRight) {
            CGContextRotateCTM(context, -M_PI_2);
            CGContextTranslateCTM(context, -imageSize.height, 0);
        } else if (orientation == UIInterfaceOrientationPortraitUpsideDown) {
            CGContextRotateCTM(context, M_PI);
            CGContextTranslateCTM(context, -imageSize.width, -imageSize.height);
        }
        if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) {
            [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
        } else {
            [window.layer renderInContext:context];
        }
        CGContextRestoreGState(context);
    }

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

【讨论】：