Question

我正在尝试使用SDWebImage实现类似于循环进度条的Instagram以进行图像加载。我正在使用这段代码，但它无法正常工作。将图像应用于图像视图后，进度条不会被隐藏。

细胞再利用问题也引发了一些问题。
还发出警告，我正在尝试更新后台线程中的进度条。

如何摆脱这些问题

- (void)setImageInImageView:(UIImageView *)imgv withURLString:(NSString *)str_url {

  //GuestDefaultProfilePic
    [imgv sd_setImageWithURL:[NSURL URLWithString:str_url] placeholderImage:[UIImage imageNamed:@"ImageGalleryBackground"] options: SDWebImageHighPriority progress:^(NSInteger receivedSize, NSInteger expectedSize){

        NSLog(@"the progress is %f", ((receivedSize*1.0f) * 100) /  expectedSize);
        progressView = [imgv viewWithTag:4321];

        if(progressView==nil)
        {
            progressView = [[THCircularProgressView alloc] initWithFrame:CGRectMake(imgv.center.x - 20 , imgv.center.y-20 , 60 , 60)];
            progressView.lineWidth = 5.0f;
            progressView.progressColor = [UIColor whiteColor];
            progressView.progressBackgroundColor = [UIColor grayColor];

            progressView.centerLabelVisible = YES;
            progressView.tag = 4321;
            [imgv addSubview:progressView];
        }

        dispatch_async(dispatch_get_main_queue(), ^{
            [progressView setPercentage:(receivedSize*1.0f) /  expectedSize];
        });
        if(receivedSize >= expectedSize)
        {
            progressView.hidden = YES;
        }
    }
    completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL){

       [progressView setHidden:YES];
        [progressView removeFromSuperview];
        [progressView setPercentage:0];
        [imgv setImage:image];

    }];


}

Answer 1

你可以试试这个，

安装pod "MBCircularProgressBar"

将UIView作为您想要进度视图的自定义单元格并设置类MBCircularProgressBarView。

@IBOutlet weak var progressView: MBCircularProgressBarView!


    cell.imgAlbum.sd_setImage(with: URL(string: imageUrl), placeholderImage: UIImage(named: "placeholderImage"), options: .highPriority, progress: { (receivedSize :Int, ExpectedSize :Int, url:URL?) in

    DispatchQueue.main.async {
        cell.ActivityView.isHidden = false;
        cell.ActivityView.value = CGFloat(receivedSize)
        cell.ActivityView.maxValue = CGFloat(ExpectedSize)
    }
}) { (image : UIImage?, error : Error?, cacheType : SDImageCacheType?, url:URL?) in

    DispatchQueue.main.async {
        UIView.animate(withDuration: 3.0, animations: {() -> Void in
            cell.ActivityView.isHidden = true;
        })}

    cell.imgBlur.removeBlurEffect()
}

Answer 2

每次调用进度块时都会添加一个新的progressView。相反，这样做：

I = imread('download.bmp');
imshow(I);title('Input Image');

imhist(I(:));title('Histogram of input image');

或者，您可以在THCircularProgressView *progressView = [imgv viewWithTag:4321]; if(progressView==nil) { progressView = [[THCircularProgressView alloc] initWithFrame:CGRectMake(imgv.center.x - 20 , imgv.center.y-20 , 60 , 60)]; progressView.lineWidth = 5.0f; progressView.progressColor = [UIColor whiteColor]; progressView.progressBackgroundColor = [UIColor grayColor]; progressView.centerLabelVisible = YES; progressView.tag = 4321; [imgv addSubview:progressView]; } [progressView setPercentage:(receivedSize*1.0f) / expectedSize];文档中使用this库或this one {/ 3}}。

对于后台线程问题，请将进度更新包装在一个调度块中：

SDWebImage

Answer 3

在github上检查cocoapod SDWebImage-CircularProgressView：
https://github.com/NikKovV/SDWebImage-CircularProgressView

通过此窗格，您可以实现

循环（使用DACircularProgress）
线性
定制

ProgressViews。

这是UIImageView的一个类别。

例如

-(void)nkv_setImageWithURL:(NSURL *)url usingProgressViewType:(ProgressViewType)progressViewType orCustomProgressView:(UIProgressView *)progressView;

Answer 4

Swift 4

mediumImageView.setImageWith(imageUrl, placeholderImage: placeHolder, options: [.progressiveDownload], usingProgressIndicatorWithProgressTintColor: UIColor.red, andTrackTintColor: UIColor.blue))

ImageView上的循环进度条使用SDWebImage块

4 个答案: