ios截屏功能

-(void)ShootmeDidSuccessful{
    //首先开启上下文
    CGSize  imageSize = self.view.bounds.size;
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0.0);
    //将某个VIew的所有内容渲染到图形的上下文中
    CGContextRef context = UIGraphicsGetCurrentContext();
    [self.view.layer renderInContext:context];
    //获得图片
    UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
    [UIImagePNGRepresentation(image) writeToFile:@"/Users/CC/Desktop/imageName.png" atomically:YES];
    
}