复制没有空值的NSDictionary吗? [英] Copying an NSDictionary without empty values?

问题描述

我正在尝试使用 dictionaryWithDictionary 方法创建一个 NSDictionary .但是，我的第一个 NSDictionary A可能有一些带有空值的键.如何创建不包含任何带有空值的键的B?我这样做是为了向 UITableView 填充与 NSDictionary 中每个非空键相对应的行.

I'm trying to create an NSDictionary with the dictionaryWithDictionary method. However, my first NSDictionary A may have some keys with empty values. How can I create B that doesn't have any keys with empty values? I'm doing all of this for the purposes of populating a UITableView with rows that correspond to each non-empty key in the NSDictionary.

推荐答案

这样的事情如何?

NSMutableDictionary *destDictionary = [NSMutableDictionary dictionaryWithCapacity:[sourceDictionary count]];
NSEnumerator *keyEnumerator = [[sourceDictionary allKeys] objectEnumerator];
id key;
while ( key = [keyEnumerator nextObject] )
    {
    NSString *object = [sourceDictionary objectForKey:key];
    if ([object length] == 0)
        continue;
    [destDictionary setObject:object forKey:key];
    }

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