iOS之SDWebimage下载图片链接带中文处理

图片连接存到了一个数组中,下载一张添加一张。但是发现有时候只显示占位图不显示图片,刚开始以为是网络慢,下载需要一段时间,但是等了好久仍然没有。打断点查看了一下,原来是因为图片链接包含中文,这样的话下载不成功了。于是用NSUTF8将字符串进行编辑,然后再去下载便可以了。

NSString * imageUrl = [imageUrl1 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

全部代码如下:

- (void)addImage:(NSArray *)imageUrlArr{
    for (NSString *imageUrl1 in imageUrlArr) {

        NSString * imageUrl = [imageUrl1 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        UIImage *newImage = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:imageUrl];//用地址去本地找图片
        if (newImage != nil) {
  //如果本地有
            // newImage就是图片
            [_imageMuarr addObject:newImage];
            [self raloadImage];
        } else {
  //如果本地没有
            //下载图片
            [[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:imageUrl] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) {
                //这里是处理下载进度的,好像没必要管他
            } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
                if (image) {
  //下载完成后
                    //同上处理
                    [_imageMuarr addObject:image];
                    [self raloadImage];
                }
            }];
        }
    }
}

- (void)raloadImage{
    _myScrollView.backgroundColor = [UIColor clearColor];//去掉预设图片,也就是背景
    UIImage *image = [_imageMuarr lastObject];//取数组的最后一个元素
    CGFloat width = 110.0 /image.size.height *image.size.width;

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake((_imageMuarr.count -1) *10.0 +_imageTotalWidth, 0, width, 110)];
    imageView.userInteractionEnabled = YES;
    imageView.image = image;
    [_myScrollView addSubview:imageView];
    _imageTotalWidth += width;
    _myScrollView.contentSize = CGSizeMake((_imageMuarr.count -1) *10.0 +_imageTotalWidth, 110);

    imageView.tag = _imageMuarr.count-1;
    UITapGestureRecognizer * singleRecognizerImageView = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(imageViewSingleTapFrom:)];
    [imageView addGestureRecognizer:singleRecognizerImageView];
}

网上查的还有一个方法是

NSString *encodedString = (NSString *)
CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
(CFStringRef)urlString,
(CFStringRef)@"!$&'()*+,-./:;=?@_~%#[]",
NULL,kCFStringEncodingUTF8);
    原文作者:shengdaVolleyball
    原文地址: https://blog.csdn.net/shengdaVolleyball/article/details/51755088
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。
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