NSDictionary一些常用用法

NSArray * skyAArrays = [NSArray arrayWithObjects:@"A天空1号",@"A天空2号",@"A天空3号",nil];

NSArray * skyBArrays = [NSArray arrayWithObjects:@"B天空1号",@"B天空2号",@"B天空3号",nil];

NSArray * skyCArrays = [NSArray arrayWithObjects:@"C天空1号",@"C天空2号",@"C天空3号",nil];

// NSArray * skyArray = [NSArray arrayWithObjects:skyAArrays,skyBArrays,skyCArrays, nil];

//字典中所有的key

NSArray * keys = [NSArray arrayWithObjects:@"name",@"sex",@"age",nil];

//字典中所有跟key对应的value

NSArray * values = [NSArray arrayWithObjects:@"liuhui",@"男",[NSNumbernumberWithInt:36],nil];

//创建字典对象方法1

NSDictionary * myDic = [[NSDictionary alloc]initWithObjects:values forKeys:keys];

NSLog(@"my dic = %@",myDic);

// 创建字典对象方法2

NSDictionary * yourDic = [[NSDictionary alloc] initWithObjectsAndKeys:skyAArrays,@"A",skyBArrays,@"B",skyCArrays,@"C",nil];

NSLog(@"your dic = %@",yourDic);

NSLog(@"%@",[yourDic objectForKey:@"A"]);

// - (NSArray *)allKeys; 返回的是 NSArray类型,方便用 objectAtIndex取出一个个key

NSLog(@"%@",[yourDic allKeys]);

NSLog(@"%@",[yourDic allValues]);

//添加数据(setObject 一般没有一种key才添加,有同名的key而用这种方法,会覆盖掉)，注意：id key 是成对出现的

[mutableDictionary setObject:@"good lucky"forKey:@"why"];

[mutableDictionary setObject:@"bye bye" forKey:@"how"];

//删除指定键值的数据

[mutableDictionary removeObjectForKey:..];

//删除所有数据

[mutableDictionary removeAllObjects];

//字典的普通遍历(无序)

for (int i =0; i < [yourDic count]; i++) {

NSLog(@"key = value <====> %@ = %@",[[yourDic allKeys] objectAtIndex:i],[yourDic objectForKey:[[yourDic allKeys]objectAtIndex:i]]);

}

// 字典的快速遍历 取出来的obj一定是key

for (id obj in yourDic) {

NSLog(@"%@",obj);

id value = [yourDic objectForKey:obj];

NSLog(@"%@",value);

}

转自：/article/1559264.html