在iOS中编辑URL字符串

时间:2013-07-21 17:05:12

标签: ios json string url uiwebview

我有一个应用程序,它解析URL链接的JSON提要,然后将这些URL存储在字符串中。这工作正常,URL链接如下所示:

(
"http://instagram.com/p/cCEfu9hUxG/"
)

如何删除URL末尾的括号和撇号?

我需要在UIWebView中打开URL,但我不能,因为URL的末尾有括号和撇号。

来自JSON Feed的信息正在UITableView中显示。当用户点击UITableView的一个单元格时,单元格的相关URL将存储在NSString中,然后由我的UIWebView读取。这是我的代码:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

int storyIndex = [indexPath indexAtPosition: [indexPath length] - 1];

NSString *storyLink = [[[[_dataSource objectAtIndex: storyIndex] objectForKey:@"entities"] objectForKey:@"urls"] valueForKey:@"expanded_url"];

//[webviewer loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:storyLink]]];
NSLog(@"\n\n LINK: %@", storyLink);

[UIView beginAnimations:@"animateAdBannerOn" context:NULL];
[UIView setAnimationDuration:1.2];
webviewer.alpha = 1.0;
[UIView commitAnimations];

}

我故事是NSString中的URL。

以下是JSON Feed:

{
"coordinates": null,
"favorited": false,
"truncated": false,
"created_at": "Sat Aug 25 17:26:51 +0000 2012",
"id_str": "239413543487819778",
"entities": {
  "urls": [
    {
      "expanded_url": "https://dev.twitter.com/issues/485",
      "url": "https://t.co/p5bOzH0k",
      "indices": [
        97,
        118
      ],
      "display_url": "dev.twitter.com/issues/485"
    }
  ],
  "hashtags": [

  ],
  "user_mentions": [

  ]
}

谢谢,Dan。

1 个答案:

答案 0 :(得分:1)

您的NSLog输出表明

NSString *storyLink = [[[[_dataSource objectAtIndex: storyIndex]
                         objectForKey:@"entities"]
                        objectForKey:@"urls"]
                       valueForKey:@"expanded_url"];

不会按预期返回NSString,而是NSArray。可能是那样的 JSON对象中"urls"的值是字典数组而不是单个字典?在这种情况下,以下应该有效:

NSString *storyLink = [[[[[_dataSource objectAtIndex: storyIndex]
                           objectForKey:@"entities"]
                          objectForKey:@"urls"]
                         objectAtIndex:0]
                        objectForKey:@"expanded_url"];

如果显示JSON输出,则可能会有更具体的答案。

注:

int storyIndex = [indexPath indexAtPosition: [indexPath length] - 1];

可以简化为

int storyIndex = indexPath.row;

(见"NSIndexPath UIKit Additions"。)

更新:要进一步本地化您的问题,我建议您拆分 将代码编码到单独的命令中,并检查"urls"数组是否为空:

NSDictionary *dict = [_dataSource objectAtIndex: storyIndex];
NSDictionary *entities = [dict objectForKey:@"entities"];
NSArray *urls = [entities objectForKey:@"urls"];
if ([urls count] > 0) {
    NSDictionary *firstUrl = [urls objectAtIndex:0];
    NSString *storyLink = [firstUrl objectForKey:@"expanded_url"];
    NSLog(@"LINK: %@", storyLink);
} else {
    NSLog(@"URLS is an empty array!!");
}

如果它仍然崩溃,请设置“所有Objective-C Exceptions上的断点”进行检查 它完全崩溃的地方。