截取屏幕图片

使用drawViewHierarchyInRect:afterScreenUpdates方法截图的代码：

#pragma mark - 截取当前屏幕

- (NSData*)dataWithScreenshotInPNGFormat

{

    UIGraphicsBeginImageContextWithOptions(self.view.frame.size, YES, 0.0);

    if([self.viewrespondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) {

        [self.view drawViewHierarchyInRect:self.view.bounds afterScreenUpdates:YES];//

    }

    else{

        [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

    }

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return UIImageJPEGRepresentation(image,0.2);

}

此方法截图不显示导航栏，使用[UIScreen mainScreen].bounds能截图出导航栏