在制作动画时捕获屏幕答案

【问题标题】：Capture Screen while animating在制作动画时捕获屏幕
【发布时间】：2013-12-27 16:16:00
【问题描述】：

我需要在动画制作时捕捉视图。以下代码我用来在动画时捕获图像。

myTimer = [NSTimer scheduledTimerWithTimeInterval:0.10 target: self selector:@selector(captureImage:) userInfo: nil repeats: YES];

[[NSRunLoop mainRunLoop] addTimer:myTimer forMode:NSRunLoopCommonModes];

UIImage * toImage = [[AppDelegateObj resultedImageArray]objectAtIndex:1];

[UIView transitionWithView:beforeImgView 
duration:5 
options:UIViewAnimationOptionTransitionCrossDissolve 
animations:^{ 
beforeImgView.image = toImage;
} 
completion:^(BOOL finished) {
[myTimer invalidate];
}];
}

-(void)captureImage:(NSTimer*) t {
    CALayer *layer;
    layer = [self.view.layer presentationLayer];
    UIGraphicsBeginImageContext(self.view.bounds.size);
    CGContextClipToRect (UIGraphicsGetCurrentContext(),self.view.frame);
    [layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}

它只捕获结果图像

【问题讨论】：

标签： ios animation calayer screen-capture

【解决方案1】：

您可以使用具有动画对象的视图副本，并使用该副本视图来捕获屏幕。即

UIView *copyView = [self.view mutableCopy];

CALayer *layer;
layer = [copyView.layer presentationLayer];
UIGraphicsBeginImageContext(self.view.bounds.size);
CGContextClipToRect (UIGraphicsGetCurrentContext(),copyView.frame);
[layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

【讨论】：

它因错误而崩溃--[UIView mutableCopyWithZone:]:unrecognized selector sent to instance
用 NSData *tempArchiveView = [NSKeyedArchiver archivedDataWithRootObject:self.view] 替换代码的第一行之后； UIView *copyView = [NSKeyedUnarchiver unarchiveObjectWithData:tempArchiveView];空白屏幕保存在照片库中
UIView 没有实现复制方法。
这个问题有什么解决办法吗？
嘿，你可以使用这行代码来处理一个 UIView 对象 UIView *copyView = [NSKeyedUnarchiver unarchiveObjectWithData:[NSKeyedArchiver archivedDataWithRootObject:self.view]];