可能使用NSScanner分隔數據

Question

我解析了一些XML數據，其中一個元素包含幾個URLs，它們之間用逗號隔開，指向JPG文件。我怎樣才能將字符串中的每個URL分開並將其分配給一個變量，以便我可以提取單個圖片？我想NSScanner會工作，因爲它掃描字符串尋找某些字符，但我不完全確定。我也讀過正則表達式也是可能的。關於我應該從哪裏開始的想法？還有其他人需要從字符串中分離URLs嗎？另外，這裏有一個XML文件供參考。

<vehicle> 
      <stock>T107810A</stock> 
      <year>2009</year> 
      <make>Porsche</make> 
      <model>Cayenne</model> 
      <trim>4WD</trim> 
      <color>Black</color> 
      <serial>WP1AD29PX9LA64805</serial> 
      <miles>38907</miles> 
      <cost>0</cost> 
      <internet>46241</internet> 
      <images>http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_1.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_2.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_3.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_4.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_5.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_6.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_7.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_8.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_9.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_10.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_11.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_12.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_13.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_14.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_15.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_16.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_17.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_18.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_19.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_20.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_21.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_22.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_23.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_24.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_25.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_26.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_27.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_28.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_29.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_30.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_31.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_32.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_33.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_34.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_35.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_36.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_37.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_38.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_39.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_40.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_41.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_42.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_43.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_44.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_45.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_46.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_47.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_48.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_49.jpg,http://cdn.lauc.us/photos/large/WP1AD29PX9LA64805_50.jpg</images> 
      <days>612</days> 
    </vehicle> 

Answer 1

從你的例子，假如你做了解析所有的休息，和你有：

NSString *allURLs = @"http://image1.jpg,http://image2.jpg,http://image3.jpg"; 

你可以得到這樣的陣列中的所有URL（for循環很有用）：

NSArray *arrayOfImagesURLs = [allURLs componentsSeparatedByString:@","];