NSDictionary，NSMutableDictionary 使用

最新推荐文章于 2024-08-23 21:22:59 发布

转载最新推荐文章于 2024-08-23 21:22:59 发布 · 91 阅读

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原文链接：http://www.cnblogs.com/fangchun/p/4732686.html

本文深入探讨了Objective-C与Swift两种编程语言在iOS开发领域的应用，包括它们各自的优势、特点以及如何在实际项目中进行选择与使用。

NSDictionary

key --->value
索引 --->内容
存储键值对

（1）三种创建方式：

NSDictionary *dict = [NSDictionary dictionaryWithObject:@"Jony" forKey:@"name"];

NSArray *keys = @[@"name", @"location"];
NSArray *objects = @[@"Jony", @"China"];
NSDictionary *dict = [NSDictionary dictionaryWithObject:objects forKey:keys];

NSDictionary *dict = @{@"name" : @"Jony", @"location", @"China"};

（2）调用

id obj = [dict objectForKey:@"name"];

id obj = dict[@"name"];

NSMutableDictionary

NSMutableDictionary *dict = [NSMutableDictionary dictionary];

[dict setObject:@"Jony" forKey:@"name"];

//deleate
[dict removeObjectForKey:(id)];

NSMutableDictionary *dict = @{@"name" : @"Jony", @"location", @"China"};

（1）字典遍历方式

NSArray *keys = [dict allKeys];

for (int i = 0; i < dict.count; i++)
{	
NSString *key = keys[i];
NSString *object = dict[key];

NSLog(@"%@ = %@", key, object);
}

[dict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop)]
{
NSLog(@"%@ -- %@", key, obj);

//Only oneTime
*stop = YES;
}

Example：

NSArray *persons = @[
@{@"name" : @"Jony", @"location", @[@"China", @"Anhui"]},
@{@"name" : @"Jake", @"location", @"USA"},
@{@"name" : @"July", @"location", @"UK"},
@{@"name" : @"Jasson", @"location", @"Jepan"}
]

NSArray *location = persons[0][@"location"][0];

转载于:https://www.cnblogs.com/fangchun/p/4732686.html