截图

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- (UIImage *)screenshot:(UIDeviceOrientation)orientation isOpaque:(BOOL)isOpaque usePresentationLayer:(BOOL)usePresentationLayer
{
CGSize size;

if (orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown) {
size = CGSizeMake(self.view.frame.size.width, self.frame.size.height);
} else {
size = CGSizeMake(self.view.frame.size.height, self.frame.size.width);
}

UIGraphicsBeginImageContextWithOptions(size, isOpaque, 0.0);

if (usePresentationLayer) {
[self.view.layer.presentationLayer renderInContext:UIGraphicsGetCurrentContext()];
} else {
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
}

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return image;
}

//使用方法：

UIImage *image = [self.view screenshot:UIDeviceOrientationPortrait isOpaque:YES usePresentationLayer:YES];

//isopaque 是否不透明

//usePresentationLayer 使用外层的意思吗没验证过

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