uiwebview 保存图片到系统相册

最新推荐文章于 2021-05-26 09:04:23 发布

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最新推荐文章于 2021-05-26 09:04:23 发布

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分类专栏： webview 文章标签： UIWebview 系统相册

本文链接：https://blog.youkuaiyun.com/qq_35827461/article/details/52161103

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本文介绍了一种在iOS应用中使用长按手势识别器来捕获并保存WebView内图片的方法。通过JavaScript与Objective-C的交互，实现了图片URL的获取，并提供了保存图片的功能。

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//长按手势
UILongPressGestureRecognizer * longPressed = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressed:)];
longPressed.delegate = self;
[self.webView addGestureRecognizer:longPressed];

(void)longPressed:(UITapGestureRecognizer*)recognizer{
//只在长按手势开始的时候才去获取图片的url
if (recognizer.state != UIGestureRecognizerStateBegan) {
return;
}
CGPoint touchPoint = [recognizer locationInView:self.webView];
NSString *js = [NSString stringWithFormat:@”document.elementFromPoint(%f, %f).src”, touchPoint.x, touchPoint.y];
self.urlToSave = [self.webView stringByEvaluatingJavaScriptFromString:js];
if (self.urlToSave.length == 0) {
return;
}

UIActionSheet* sheet = [[UIActionSheet alloc]initWithTitle:nil delegate:self cancelButtonTitle:@”取消” destructiveButtonTitle:nil otherButtonTitles:@”保存图片”, nil];
sheet.cancelButtonIndex = sheet.numberOfButtons - 1;
[sheet showInView:[UIApplication sharedApplication].keyWindow];

// NSLog(@”获取到图片地址：%@”,self.urlToSave);
}

(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (actionSheet.numberOfButtons - 1 == buttonIndex) {
return;
}
NSString* title = [actionSheet buttonTitleAtIndex:buttonIndex];
if ([title isEqualToString:@”保存图片”]) {

NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:self.urlToSave]];
UIImage* image = [UIImage imageWithData:data];

//UIImageWriteToSavedPhotosAlbum(image, nil, nil,nil);
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
```
        }
```
}

(void)image:(UIImage )image didFinishSavingWithError:(NSError)error contextInfo:(void*)contextInfo
{
if (error){

NSLog(@"Error");

    }else {

        //弹出动画提示取消收藏成功

        self.tip.image = [UIImage imageNamed:@"Collect.png"];

        [UIView animateWithDuration:1 animations:^{

            self.tip.alpha = 1.0f;

            self.tip.frame = CGRectMake([UIScreen mainScreen].bounds.size.width / 3 - 5 * ScreenWidth, 160 * ScreenHeigth - 5 * ScreenHeigth, [UIScreen mainScreen].bounds.size.width / 3 + 10 * ScreenWidth, 130 * ScreenHeigth);
            [self.view addSubview:self.tip];

        } completion:^(BOOL finished) {

            self.tip.frame = CGRectMake([UIScreen mainScreen].bounds.size.width / 3, 160 * ScreenHeigth, [UIScreen mainScreen].bounds.size.width / 3, 120 * ScreenHeigth);

            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

                [UIView animateWithDuration:0.2 animations:^{

                    self.tip.alpha = 0.f;


                }];

            });
        }];

    NSLog(@"OK");

}

}

//可以识别多个手势
-(BOOL)gestureRecognizer:(UIGestureRecognizer )gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer )otherGestureRecognizer
{
return YES;
}