我必须从视频中提取缩略图(来自url)，我使用以下代码:NSString*stringUrl=video.stringurl;NSURL*url=[NSURLURLWithString:stringUrl];AVURLAsset*asset=[[AVURLAssetalloc]initWithURL:urloptions:nil];AVAssetImageGenerator*imageGenerator=[[AVAssetImageGeneratoralloc]initWithAsset:asset];[imageGeneratorsetRequestedTimeToleranceBe

我有一个dataTaskWithUrl:varheaders:NSDictionary=["X-Mashape-Key":"my-secret-key","Accept":"application/json"]varstringUrl="https://restcountries-v1.p.mashape.com/all"stringUrl=stringUrl.stringByReplacingOccurrencesOfString("",withString:"+")leturl=NSURL(string:stringUrl)letsession=NSURLSession.share

我有一个dataTaskWithUrl:varheaders:NSDictionary=["X-Mashape-Key":"my-secret-key","Accept":"application/json"]varstringUrl="https://restcountries-v1.p.mashape.com/all"stringUrl=stringUrl.stringByReplacingOccurrencesOfString("",withString:"+")leturl=NSURL(string:stringUrl)letsession=NSURLSession.share