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POtaking a screenshot before my IOS app launch
 

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  1. POtaking a screenshot before my IOS app launch
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    <p>Is it possible taking a screenshot before my IOS app launched.</p> <p>I can simply take screenshot of my app's main view by:</p> <pre><code> UIGraphicsBeginImageContext(self.view.frame.size); [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil); </code></pre> <p>I also tried this method UIKit way:</p> <pre><code> // 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(); UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil); UIGraphicsEndImageContext(); </code></pre> <p>They all works on capturing screenshot of my app.</p> <p>How may I capture the screenshot (of the moment) BEFORE my app launched.</p> <p>I even add the second sample code to the begin of main.m, it does NOT work. (a full screen blank white image was saved)</p> <p>I want to use the screenshot as the background picture of my app :) <img src="https://i.stack.imgur.com/pKkK6.jpg" alt="my app is running..."></p>
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    1. USJiulong Zhao
    1. USJiulong Zhao
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    1. COLike a picture of the home screen?
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      1. POtaking a screenshot before my IOS app launch
      1. USJustin Paulson
    2. COyes, Justin. then use it as background picture of my app
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      1. POtaking a screenshot before my IOS app launch
      1. USJiulong Zhao
 

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