Ios NSString键的NSDictionary异常行为

日志：

2014-04-15 20:51:37.336 AppDemo[2201:60b]下载编辑字符串=6226691114401792
2014-04-15 20:51:37.337存在ID为6226691114401792的AppDemo[2201:60b]2）项

我是Obj C的新手，几个小时来我一直在试图解决这个问题。请帮助我理解为什么它在提供NSString作为键时找不到对象

NSString *downloadedItemIDString = [dict objectForKey:@"id"];
NSLog(@"downloadedItemIDString = %@", downloadedItemIDString);

if([storedRecordsDict objectForKey:downloadedItemIDString] != nil)
      NSLog(@"1) Item WITH ID %@ EXISTS!", downloadedItemIDString);
if([storedRecordsDict objectForKey:@"6226691114401792"] != nil)
      NSLog(@"2) Item WITH ID 6226691114401792 EXISTS!");

---

首先检查您的downloadedItemIDString是否等于@“6226691114401792”，然后这两个if条件都将执行。

id值上可能有一些空格。在log语句中添加引号以确保：

NSLog（@“downloadedItemIDString='%@'，downloadedItemIDString）并查看是否出现任何空格。2014-04-15 21:05:19.314 AppDemo[2232:60b]DownloadEditTempString='6226691114401792'2014-04-15 21:05:19.315 AppDemo[2232:60b]2）ID为'6226691114401792'的项目存在！我添加了“”但仍然很神秘..：/另一个测试：添加以下日志：
NSLog（@“downloadedItemIDString class=%@，[downloadedItemIDString class]）
downloadedItemIDString
可能不是NSString，而是NSNumber。
NSString *downloadedItemIDString = [dict objectForKey:@"id"];
NSLog(@"downloadedItemIDString = %@", downloadedItemIDString);
if([downloadedItemIDString isEqualToString:@"6226691114401792"])
{
    if([storedRecordsDict objectForKey:downloadedItemIDString] != nil)
        NSLog(@"1) Item WITH ID %@ EXISTS!", downloadedItemIDString);
if([storedRecordsDict objectForKey:@"6226691114401792"] != nil)
    NSLog(@"2) Item WITH ID 6226691114401792 EXISTS!");
}