如何获取NSMutableDictionary计数在iphone？ [英] How to get NSMutableDictionary count in iphone?

问题描述

我想在iphone中获取NSMutableDictionary计数。我想知道有多少项目在NSMutableDictionry。我尝试这些代码找出解决方案，但是没有帮助我很多。

I want to get NSMutableDictionary count in iphone. I want to know how many items are in NSMutableDictionry. I tried these code to find out the solution but, not helped me lot.

NSLog(@"Count : %d", [mutableDictionary count]);

它总是返回0。如何获得计数NSMutableDictionary在iPhone？提前感谢。

It is always returns '0'. How to get the count of NSMutableDictionary in iPhone? Thanks in advance.

推荐答案

您可以了解有多少键对象（键值）对： / p>

You can find out how many key-object (key-value) pairs there are like so:

NSArray * allKeys = [mutableDictionary allKeys];
NSLog(@"Count : %d", [allKeys count]);

EDIT

文档， NSDictionary 的 count 方法（或属性）也应该工作。我认为你可能已经收到0计数，因为字典是空的或零。我提供了我的解决方案，因为我倾向于更多地关注枚举密钥，而不是直接计数条目。

Upon looking through the dictionary documentation, NSDictionary's count method (or property) should work as well. I think you may have been receiving 0 count because the dictionary was empty or nil. I offered my solution because I tend to care more about enumerating the keys than counting the entries directly.

请考虑您在其他地方修复该问题的事实。
•实际填充字典

或

•通过修复mutableDictionary是某种不正确的错误

Please consider the fact that you fixed the issue somewhere else.
• By actually populating the dictionary
or
• By fixing a bug where mutableDictionary was somehow nil

我运行这个测试代码并获得注释输出

I run this test code and get the commented output

  NSMutableDictionary * countDict = [NSMutableDictionary dictionaryWithObject:@"test" forKey:@"test"];
  [countDict setObject:@"foo" forKey:@"bar"];
  NSLog(@"test count %d", countDict.count); //test count 2
  countDict = nil;
  NSLog(@"test count %d", countDict.count); //test count 0

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