ios学习 持续更新

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//将整个self.view大小的图层形式创建一张图片

    UIGraphicsBeginImageContext(self.view.frame.size);

    CGContextRef context = UIGraphicsGetCurrentContext();

    [self.view.layer renderInContext:context];

    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    //然后将该图片保存到图片图

    UIImageWriteToSavedPhotosAlbum(theImage,self,nil,nil);