//
// main.m
// dictionary
//
// Created by facial on 24/8/15.
// Copyright (c) 2015 facial_huo. All rights reserved.
//
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
// insert code here...
NSLog(@"Hello, World!");
NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:
@"one", @"1",
@"three", @"3",
@"two", @"2",
nil ];
//Dictionary
//快速枚举法
for(id item in dict) {
NSLog(@"%@", item);
}
//遍历 key 通过key取得value
NSEnumerator *keyEnume = [dict keyEnumerator];
id obj;
while (obj = [keyEnume nextObject]) {
NSLog(@"%@, %@", obj, [dict objectForKey: obj]);
}
//遍历value
NSEnumerator *valueEnume = [dict objectEnumerator];
id obj2;
while ( obj2 = [valueEnume nextObject]) {
NSLog(@"%@", obj2);
}
//通过key取value
NSString *str;
str = [dict valueForKey: @"2"]; // str = two
NSLog(@"%@", str);
// MutableDictionary
//初始化MutableDictionary , 添加键值对
NSMutableDictionary *mutableDict = [NSMutableDictionary new];
[mutableDict setObject: @"yellow" forKey: @"1"];
[mutableDict setObject: @"red" forKey: @"2"];
[mutableDict setObject: @"black" forKey: @"3"];
NSLog(@"%@", mutableDict);
//删除单个键值对
[mutableDict removeObjectForKey: @"1"];
//删除多个键值
NSArray *array = [NSArray arrayWithObjects: @"1", @"2", nil];
[mutableDict removeObjectsForKeys:array];
NSLog(@"%@", mutableDict);
}
return 0;
}