How to Use Objective-C Dictionaries

最新推荐文章于 2021-01-20 01:54:01 发布

cenphoenix

最新推荐文章于 2021-01-20 01:54:01 发布

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分类专栏： iphone 文章标签： Objective-C C C++ C#

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本文介绍了如何在Objective-C中使用字典，包括实例化、添加和检索对象等基本操作，并提供了一个简单的示例来帮助理解。

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How to Use Dictionaries

Like an array, a dictionary is a list of objects. However, dictionaries make it
easier to organize data by providing “keys” that make it a snap to find the
things you put in there. These are sometimes referred to as a hash or a
hash-table.

Instantiate a dictionary

NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];

Add objects to a dictionary indexed by keys

[dictionary setObject:@"A Book about the Letter A" forKey:@"A"];
[dictionary setObject:@"A Book about the Letter B" forKey:@"B"];
[dictionary setObject:@"A Book about the Letter C" forKey:@"C"];

Retrieve an object from a dictionary with a key

NSLog([dictionary objectForKey:@"B"]);

Release a dictionary

[dictionary release];

Cool – hope you enjoyed this snippet of da codes! Once you get use to the square brackets and verbose parameter prefixes Objective-C starts to feel like the programming languages that you are used to.