iOS-OC-NSDictionary和NSMutableDictionary用法大全详细说明

+ (void)NSDictionaryCreateMethod
{
NSDictionary *dict = @{@"one":@"1",@"two":@"2",@"three":@"3",@"four":@"4"};
NSLog(@"dict = %@",dict);

//减方法
NSDictionary *dict1 = [[NSDictionary alloc] initWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three",@"4",@"four",nil];
NSLog(@"dict1 = %@",dict1);

//对应的加方法
NSDictionary *dict2 = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three",@"4",@"four",nil];
NSLog(@"dict2 = %@",dict2);

NSDictionary *dict3 = [[NSDictionary alloc] initWithDictionary:dict];
NSLog(@"dict3 = %@",dict3);

NSDictionary *dict4 = [NSDictionary dictionaryWithDictionary:dict];
NSLog(@"dict4 = %@",dict4);

NSArray *keys = @[@"one",@"two",@"three",@"four"];
NSArray *objs = @[@"1",@"2",@"3",dict1];
NSDictionary *dict5 = [[NSDictionary alloc] initWithObjects:objs forKeys:keys];
NSLog(@"dict5 = %@",dict5);

NSDictionary *dict6 = [NSDictionary dictionaryWithObjects:objs forKeys:keys];
NSLog(@"dict6 = %@",dict6);

}

+ (void)NSDictionarySimpleMethod
{
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three",@"4",@"four",nil];
//字典中的键值数
NSLog(@"count = %lu",[dict count]);

//通过key找到对应的obj 不能通过obj  找到key
NSLog(@"%@",[dict objectForKey:@"three"]);

//遍历字典 枚举  或 快速枚举
NSEnumerator *e1 = [dict keyEnumerator];
id obj = nil;
while (obj = [e1 nextObject])
{
NSLog(@"key:%@,value:%@",obj,[dict objectForKey:obj]);
}

NSEnumerator *e2 = [dict objectEnumerator];

while (obj = [e2 nextObject])
{
NSLog(@"value:%@",obj);
}

//快速枚举 实际上是字典key的枚举
for(id objin dict)
{
NSLog(@"obj = %@",obj);//和 NSLog(@"dict = %@",dict); 打印的顺序是不一样的
}

NSArray *keyArray = [dict allKeys];
NSArray *objArray = [dict allValues];
for(int i =0;i<[dict count];i++)
{
NSLog(@"key : %@,value : %@",[keyArray objectAtIndex:i],[objArray objectAtIndex:i]);
}

}

+ (void)NSMutableDictionaryCreateMethod
{
NSDictionary *dict = @{@"one":@"1",@"two":@"2",@"three":@"3",@"four":@"4"};
NSMutableDictionary *dict1 = [[NSMutableDictionary alloc]initWithDictionary:dict];
NSLog(@"dict1 = %@",dict1);

//对应的加方法
NSMutableDictionary *dict2 = [NSMutableDictionary dictionaryWithDictionary:dict];
NSLog(@"dict2 = %@",dict2);

//创建一个空的可变字典
NSMutableDictionary *dict3 = [[NSMutableDictionary alloc] init];
NSLog(@"dict3&count = %lu",[dict3 count]);

//对应的加方法
NSMutableDictionary *dict4 = [NSMutableDictionary dictionary];
NSLog(@"dict4&count = %lu",[dict4 count]);

//可变字典自己的初始化方式
NSMutableDictionary *dict5 = [[NSMutableDictionary alloc] initWithCapacity:10];
NSLog(@"dict5&count = %lu",[dict5 count]);

NSMutableDictionary *dict6 = [NSMutableDictionary dictionaryWithCapacity:10];
NSLog(@"dict6&count = %lu",[dict6 count]);

}

+ (void)NSMutableDictionarySimpleMethod
{
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three",@"4",@"four",nil];
//增加字典元素  或者修改  若果没有增加 若果有修改 覆盖
[dict setObject:@"5" forKey:@"five"];
NSLog(@"%@",dict);
[dict setObject:@"6666" forKey:@"five"];
NSLog(@"%@",dict);

//因为字典是无序的 没有 交换插入  追加
//删除
[dict removeObjectForKey:@"five"];
NSLog(@"%@",dict);

[dict removeAllObjects];
NSLog(@"%@",dict);//变成空字典了

//重设字典
NSDictionary *dict1 = @{@"one":@"111",@"two":@"222",@"three":@"333",@"four":@"444"};
[dict setDictionary:dict1];
NSLog(@"%@",dict);//变成空字典了

}