以编程方式截图iOs 5

Question

我正在开发一个iOS5 iPhone应用程序，我想在用户按下故事板中视图的按钮时以编程方式截图。我尝试过很多代码，但它们都是针对iOs的老版本。我在iOS5里怎么做?谢谢！！

Answer 1

- (void)drawRect:(CGRect)rect {   
     UIGraphicsBeginImageContext(self.bounds.size);
     [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
     UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();  
     UIGraphicsEndImageContext();   
}

Answer 2

嗯，有几种方法可以通过编程来捕获iPhone屏幕

使用UIKIT http://developer.apple.com/library/ios/#qa/qa1703/_index.html

• Using http://developer.apple.com/library/ios/#qa/qa1702/_index.html

• Using http://developer.apple.com/library/ios/#qa/qa1704/_index.html

• Using

1. AVFoundation OpenGL OpenGL ES视图

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()；newImage窗口

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

在这5种方法中，我发现第一种方法对于复制-粘贴和应用压缩级别非常方便，因为第一种方法给出的图像是真实的像素数据。

Answer 3

因为这是一个老问题，所以我把代码放在这里，希望能对大家有所帮助。(代码从苹果公司复制：http://developer.apple.com/library/ios/#qa/qa1703/_index.html)

- (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;
}