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//第一种创建方法，字典是不可变的，初始化之后不可添加删除元素
NSDictionary *dict=[NSDictionary dictionaryWithObject:@“v1”forKey:@“k1”];
//第二种创建方法，最常用
NSDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys:
@“v1”,@“k1”,
@“v2”,@“k2”,
@“v3”,@“k3”,
@“v4”,@“k4”,nil];
//第三种创建方法
NSArray *values=[NSArray arrayWithObjects:@“v1”,@“v2”,@“v3”,@“v4”,nil]; NSArray *keys=[NSArray arrayWithObjects:@“k1”,@“k2”,@“k3”,@“k4”,nil]; NSDictionary *dict=[NSDictionary dictionaryWithObjects:values forKeys:keys];
NSDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys: @“v1”,@“k1”, @“v2”,@“k2”, @“v3”,@“k3”, @“v4”,@“k4”,nil]; //获取迭代器 NSEnumerator *enumerator=[dict keyEnumerator]; id key =nil while(key=[enumerator nextObject]){ id value=[dict objectForKey:key]; }
NSDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys: @“v1”,@“k1”, @“v2”,@“k2”, @“v3”,@“k3”, @“v4”,@“k4”,nil]; //使用block [dict enumerateKeysAndObjectsUsingBlock:^(id key,id value,BOOL *stop){ NSLog(@“%@%@“,key,value); }
//创建一个空的字典 NSMutableDictionary *dict=[NSMutableDictionary dictionary]; //创建两个字符串对象 NSString *str1=[NSString stringWithString:@“stu.gx203.1”]; NSString *str2=[NSString stringWithString:@“stu.gx203.2”]; //将字符串对象添加到可变字典中 [dict addObject:str1 forKey:@“k1”]; [dict addObject:str2 forKey:@“k2”];
添加其他字典到当前字典
NSDictionary *otherdict=[NSDictionary dictionaryWithObject:@“str.gx203.3” forKey:@“k3”]; [dict addEntriesFromDictionary:otherdict];
OC——Foundation—常用的类（3）----NSDictionary
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原文地址：http://www.cnblogs.com/hqzxbb/p/4413894.html
