UIView截图

最新推荐文章于 2021-12-10 20:24:11 发布

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最新推荐文章于 2021-12-10 20:24:11 发布

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分类专栏： UIView

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本文介绍了如何在iOS应用中实现视图和scrollView的截图功能，包括利用UIKit框架提供的API进行截图的方法。

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- (IBAction)displayImage:(id)sender {

UIImageView *view=[[UIImageView alloc]initWithImage:[self getImageWithView:self.view]];

view.frame=CGRectMake(100, 100, 100, 100);

[self.view addSubview:view];

}

// 从view上截图

- (UIImage *)getImageWithView:(UIView *)view {

UIGraphicsBeginImageContextWithOptions(CGSizeMake(150, 150), NO, 1.0); //NO，YES 控制是否透明

[view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

// 生成后的image

return image;

}

//在scrollView上截图

- (UIImage*)getCapture
{

UIImage* viewImage = nil;

UITableView *scrollView = self.tableView;

    UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, scrollView.opaque, 0.0);
    {
        CGPoint savedContentOffset = scrollView.contentOffset;
        CGRect savedFrame = scrollView.frame;

        scrollView.contentOffset = CGPointZero;
        scrollView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);

        [scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
        viewImage = UIGraphicsGetImageFromCurrentImageContext();

        scrollView.contentOffset = savedContentOffset;
        scrollView.frame = savedFrame;
    }
    UIGraphicsEndImageContext();

    return viewImage;

}