没有状态栏的屏幕截图

Question

我正在尝试使用this代码截图：

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor lightGrayColor];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidAppear:(BOOL)animated{
    UIImageWriteToSavedPhotosAlbum([self screenshot], self, @selector(image: didFinishSavingWithError:contextInfo:), nil);
}

- (UIImage*)screenshot
{
// Create a graphics context with the target size
// On iOS 4 and later, use UIGraphicsBeginImageContextWithOptions to take the scale into consideration
// On iOS prior to 4, fall back to use UIGraphicsBeginImageContext
CGSize imageSize = [[UIScreen mainScreen] bounds].size;
if (NULL != UIGraphicsBeginImageContextWithOptions)
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
else
    UIGraphicsBeginImageContext(imageSize);

CGContextRef context = UIGraphicsGetCurrentContext();

// Iterate over every window from back to front
for (UIWindow *window in [[UIApplication sharedApplication] windows])
{
    if (![window respondsToSelector:@selector(screen)] || [window screen] == [UIScreen mainScreen])
    {
        // -renderInContext: renders in the coordinate space of the layer,
        // so we must first apply the layer's geometry to the graphics context
        CGContextSaveGState(context);
        // Center the context around the window's anchor point
        CGContextTranslateCTM(context, [window center].x, [window center].y);
        // Apply the window's transform about the anchor point
        CGContextConcatCTM(context, [window transform]);
        // Offset by the portion of the bounds left of and above the anchor point
        CGContextTranslateCTM(context,
                              -[window bounds].size.width * [[window layer] anchorPoint].x,
                              -[window bounds].size.height * [[window layer] anchorPoint].y);

        // Render the layer hierarchy to the current context
        [[window layer] renderInContext:context];

        // Restore the context
        CGContextRestoreGState(context);
    }
}

// Retrieve the screenshot image
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return image;
}

但是保存的图像的状态栏是空白的，包括信号、时间和电池。如何截取包含状态栏内容的截图？

​

Answer 1

截图前隐藏状态栏，如下所示：

([UIApplication sharedApplication setStatusBarHidden:是]；)

Answer 2

(使用iOS 7和自动布局进行测试)

我使用模拟器的“截图”功能，并结合一些条件代码编译。通过取消对#define的注释，我可以快速切换到启动屏幕的“截图”模式

主要技巧是在打开屏幕的view controller出现时隐藏状态栏，但动画非常长，因此您有足够的时间点击模拟器中的屏幕截图命令，该命令会将屏幕截图直接放在桌面上(如果您愿意，也可以在设备上截图)。

使用下面的代码，状态栏立即消失，这要归功于“UIStatusBarAnimationNone”，但“滑出屏幕”是在很长一段时间内(在下面的代码中是5000.0秒)。因此，在条形图开始“移动”垂直尺寸的20个点中的1个点之前，您有大约5000/20 = 250秒的时间来截取屏幕截图(以及一些咖啡)。

- (BOOL)prefersStatusBarHidden
{
    return YES;
}

- (UIStatusBarAnimation)preferredStatusBarUpdateAnimation
{
    #ifdef kTAKE_LAUNCHIMAGE_SCREENSHOT
       return UIStatusBarAnimationNone;
    #else
       return UIStatusBarAnimationSlide;
    #endif
}

- (void)removeStatusBarAnimated
{
    #ifdef kTAKE_LAUNCHIMAGE_SCREENSHOT
        [UIView animateWithDuration:5000.0 animations:^{
            [self setNeedsStatusBarAppearanceUpdate];
        }];
    #else
        [UIView animateWithDuration:2.0 animations:^{
            [self setNeedsStatusBarAppearanceUpdate];
        }];
    #endif
}

有关在iOS 7中控制状态栏的更多信息，请查看我的答案和代码：

https://stackoverflow.com/a/20594717/1869369

Answer 3

这是一个不隐藏状态栏的解决方案，只需使用正确的边界并注意y偏移量应该为负，这里的“ViewController”是在状态栏下面填充屏幕的视图：(代码写在地图中)

UIGraphicsBeginImageContextWithOptions(self.map.bounds.size, NO, [UIScreen mainScreen].scale);
CGRect bounds = CGRectMake(0, -1*(self.view.bounds.size.height-self.map.bounds.size.height), self.map.bounds.size.width, self.map.bounds.size.height);

BOOL success = [ self.view drawViewHierarchyInRect:bounds afterScreenUpdates:YES];

UIImage* image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();