ios NSDictionary
来源:互联网 发布:mit 算法导论 pdf 编辑:程序博客网 时间:2024/05/29 09:26
NSDictionary:
NSDictionary *dic2 = [NSDictionary dictionaryWithObjectsAndKeys:
@"value1", @"key1",@"value2", @"key2",
@"value3", @"key3",
@"value4", @"key4",
nil];
//所有的键集合
NSArray *keys = [dic3 allKeys];
NSLog(@"keys :%@", keys);
//所有值集合
NSArray *values = [dic3 allValues];
NSLog(@"values :%@", values);
NSMutableDictionary
NSMutableDictionary *mutableDic = [[NSMutableDictionary alloc] initWithObjectsAndKeys:
@"mvalue1", @"mkey1",
@"mvalue2", @"mkey2", nil];
//添加现有的字典数据
[mutableDic addEntriesFromDictionary:dic3];
NSLog(@"mutableDic :%@",mutableDic);
//添加新的键值对象
[mutableDic setValue:@"set1" forKey:@"setKey1"];
NSLog(@"set value for key :%@",mutableDic);
//以新的字典数据覆盖旧的字典数据
[mutableDic setDictionary:dic2];
NSLog(@" set dictionary :%@",mutableDic);
//根据key删除value
[mutableDic removeObjectForKey:@"key1"];
NSLog(@"removeForkey :%@",mutableDic);
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