Nerver use NSNumber as keys in Dictionary when Serialize

Nerver use NSNumber as keys in Dictionary when Serialize

作者：ani di
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如果你的NSDictionary中有包含NSNumber的Key，那麼在序列化此字典時你會莫名其妙的失敗。像這樣

1.     NSMutableDictionary* dic = [NSMutableDictionary dictionaryWithCapacity:10]; 
2.     [dic setObject:@"test" forKey:[NSNumber numberWithLongLong:1]]; 
3.     if ([dic writeToFile:@"/tmp/1.xml" atomically:NO] == NO) 
4.     { 
5.         puts("Oops."); 
6.     }

網絡上已經有很多人在這裏栽過跟頭了。這個也不能怪蘋果，因爲在文檔中已經說得很清楚了Property List Programming Guide

...although NSDictionary and CFDictionary objects allow their keys to be objects of any type, if the keys are not string objects, the collections are not property-list objects.

plist格式就是這麼死，只有key是string纔是合法的。大家不能把NSDictionay和Property list混爲一談，儘管它們之間的轉換非常簡單。