NSDictionary 使用总结

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mb2928593829 2022-04-12 11:45:46 ©著作权

文章标签 Objective C 数组初始化 bundle 文章分类 C/C++ 后端开发

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NSDictionary使用小结

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#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
@autoreleasepool {
//创建字典
NSDictionary *dic1 = [NSDictionary dictionaryWithObject:@"value" forKey:@"key"];
NSLog(@"dic1 :%@", dic1);
//创建多个字典
NSDictionary *dic2 = [NSDictionary dictionaryWithObjectsAndKeys:
@"value1", @"key1",
@"value2", @"key2",
@"value3", @"key3",
@"value4", @"key4",
nil];
NSLog(@"dic2 :%@", dic2);
//根据现有的字典创建字典
NSDictionary *dic3 = [NSDictionary dictionaryWithDictionary:dic2];
NSLog(@"dic3 :%@", dic3);
//根据key获取value
NSLog(@"key3 value :%@", [dic3 objectForKey:@"key3"]);
//获取字典数量
NSLog(@"dic count :%d", dic3.count);
//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 *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);
//快速遍历
for(id key in mutableDic) {
NSLog(@"key :%@ value :%@", key, [mutableDic objectForKey:key]);
}
//枚举遍历
NSEnumerator *enumerator = [mutableDic keyEnumerator];
id key = [enumerator nextObject];
while (key) {
NSLog(@"enumerator :%@", [mutableDic objectForKey:key]);
key = [enumerator nextObject];
}
//根据key数组删除元素
[mutableDic removeObjectsForKeys:keys];
NSLog(@"removeObjectsForKeys :%@",mutableDic);
[mutableDic removeAllObjects];
//删除所有元素
NSLog(@"remove all :%@", mutableDic);
}
return 0;
}

日志:

NSDictionary 使用总结

NSArray *m_array = [NSArray arrayWithObjects:@"first",@"second",nil];
NSArray *n_array = [NSArray arrayWithObjects:@"one",@"two",@"three",nil];
//使用类方法初始化,系统自动释放内存
NSDictionary *test_dictionary = [NSDictionary dictionaryWithObjectsAndKeys:m_array,@"sort",n_array,@"number",nil];

NSLog(@"myDictionary = %@",myDictionary);

//获取字典包含对象数目
int dict_size = [test_dictionary count];
//访问字典中的值
NSArray *sort_array = [test_dictionary objectForKey:@"sort"];
//获取键值
NSArray *keys = [test_dictionary allKeysForObject:sort_array];
//获取字典中所有值，数组
NSArray *all_value = [test_dictionary allValues];
//快速枚举
for(id key in test_dictionary)
{
NSLog(@"key: %@,value: %@",key,[test_dictionary objectForKey:key]);
}
//如果字典只包含属性列表对象(NSData,NSDate,NSNumber,NSString,NSArray或NSDictionary)可以保存到文件中
NSString *filePath = [[[NSBundlemainBundle]resourcePath]stringByAppendingPathComponent:@"test_dict.plist"];
[test_dictionary writeToFile:filePath atomically:YES];
//用文件填充
NSDictionary *myDict =[NSDictionary dictionaryWithContentsOfFile:filePath];
//可变字典
NSMutableDictionary *dictMutable = [[NSMutableDictionary alloc]initWithObjectsAndKeys:m_array,@"sort",n_array,@"number", nil];
NSString *str = @"10_10";
//修改对象
[dictMutable setObject:string4 forKey:@"sort"];
//删除对象
[dictMutable removeObjectForKey:@"number"];
//删除多个对象
NSArray *key_array =[NSArray arrayWithObjects:@"sort",@"number", nil];
[dictMutable removeObjectForKey:key_array];
//删除所有对象
[dictMutable removeAllObjects];

//k-v 键值对

//key:对象标识符，不重复

//value:对象，可重复

//字典与数组的区别：数组有序，字典无序；

//分可变字典不可变字典

//创建三个person对象

Person *person1 = [Person PersonWithName:@"xi" age:18];

Person *person2 = [Person PersonWithName:@"aa" age:9];

Person *person3 = [Person PersonWithName:@"ao" age:3];

//将对象添加到字典中

NSDictionary *pDict = [[NSDictionary alloc]initWithObjectsAndKeys:

person1,@"xi",

person2,@"aa",

person3,@"ao", nil];

//便利构造器

NSDictionary *pD = [NSDictionary dictionaryWithObjects:@[person1,person2,person3] forKeys:@[@"xi",@"aa",@"ao"]];

NSLog(@"%@",pDict);

//字面量创建不可变

NSDictionary *pDict1 = @{ @"xi":person1,

@"aa":person2,

@"ao":person3 };

NSLog(@"%@",pDict);

NSLog(@"-----------------使用枚举器，便利-------------------------");

NSEnumerator *keyEnum = [pDict1 keyEnumerator];

id obj;

while ( obj = [keyEnum nextObject]) {

NSLog(@"key=%@",obj);

}

NSEnumerator *keyEnum1 = [pDict1 objectEnumerator];

id obj1;

while ( obj1 = [keyEnum1 nextObject]) {

NSLog(@"value=%@",obj1);

}

NSLog(@"-----------------使用枚举器，便利-------------------------");

//从字典取出一个对象

Person *p = [pDict objectForKey:@"xi"];

Person *p1 = pDict[@"xi"];

NSLog(@"%@",p);

NSLog(@"%@",p1);

//打印所有key

NSLog(@"key=%@",[pDict allKeys]);

//打印所有value

NSLog(@"value=%@",[pDict allValues]);

//循环的打印字典中的键值对

for (int i = 0; i < pDict.count; i++) {

//先通过循环从allkeys 数组取出每一个key

NSString *key = [pDict allKeys][i];

Person *p = pDict[key];

NSLog(@"key=%@,value=%@",key, p);//调用description方法

}

//可变字典

//1,创建

NSMutableDictionary *mutaDic = [NSMutableDictionary dictionary];

NSMutableDictionary *mutaDic1 = [NSMutableDictionary dictionaryWithObjectsAndKeys:person1,@"ao",person2,@"xi", nil];

//2，添加

[mutaDic1 setObject:person3 forKey:@"aa"];

//3，替换

[mutaDic1 setObject:person3 forKey:@"ao"];

//4，根据key去删除value

[mutaDic1 removeObjectForKey:@"ao"];

//5，删除所有

[mutaDic1 removeAllObjects];

for (int i = 0; i < mutaDic1.count; i++) {

//先通过循环从allkeys 数组取出每一个key

NSString *key = [mutaDic1 allKeys][i];

Person *p = mutaDic1[key];

NSLog(@"key=%@,value=%@",key, p);//调用description方法

}

//1,创建一个数组，

NSArray *classArray = @[@"zhang",@"zhu"];

//2,创建一个数组，

NSArray *classArray1 = @[@"zha",@"zh"];

//1,创建一个大数组，

NSArray *classArrayB = @[classArray,classArray1];

NSDictionary *allClassDict = @{@"36": classArray,

@"37": classArray1,

};

NSLog(@"%@",allClassDict[@"36"][0]);

//NSset 元素唯一，无序，随机抽取，

//1,

NSSet *set = [NSSet setWithObjects:@"c",@"d",@"a", nil];

NSLog(@"%@",set);

NSLog(@"%@",[set anyObject]);

if ([set containsObject:@"c"]) {

NSLog(@"you c");

}

//1,创建年龄数组

NSArray *ageArray = @[@12, @33, @65];

//使用数组创建集合

NSCountedSet *ageSet = [NSCountedSet setWithArray:ageArray];

//年龄是33的个数

NSLog(@"%lu",[ageSet countForObject:@33 ]);

//快速枚举

NSArray *arr = @[@"wang",@"jin",@"wei",@11];

for (id a in arr) {

NSLog(@"%@",a);

}

NSDictionary *dict = @{@"11": @"v1",

@"22": @"v2"};

//默认取key

for (NSString * key in dict) {

NSLog(@"%@",key);

}

//取value的值

for (NSString * value in [dict allValues]) {

NSLog(@"%@",value);

}

//创建一个保存年龄的数组

NSMutableArray *mArr = [NSMutableArray arrayWithObjects:@"12", @"2", @"9", @"21", nil];

for (int i = 0; i < mArr.count - 1; i++) {

for (int j = 0; j < mArr.count - 1 - i; j++) {

if ([mArr[j] intValue] > [mArr[j+1] intValue]) {

[mArr exchangeObjectAtIndex:j withObjectAtIndex:j+1];

}

NSLog(@"%@",mArr);

//默认升序

[mArr sortedArrayUsingSelector:@selector(compare:)];

NSLog(@"%@",mArr);

// //创建三个person对象

// Person *person1 = [Person PersonWithName:@"xi" age:18];

// Person *person2 = [Person PersonWithName:@"aa" age:19];

// Person *person3 = [Person PersonWithName:@"ao" age:38];

NSMutableArray *personArray = [NSMutableArray arrayWithObjects:person1, person2, person3, nil];

NSLog(@"%@",personArray);

//按年龄从小到大排序

for (int i = 0; i < personArray.count - 1; i++) {

for (int j = 0; j < personArray.count - i - 1;j++) {

if ([personArray[j] age] > [personArray[j + 1] age] ) {

[personArray exchangeObjectAtIndex:j withObjectAtIndex:j + 1];

}

NSLog(@"%@",personArray);

NSDictionary的常见用法总结

NSArray *array1 = [NSArray arrayWithObjects:@"iphone",@"ipod",nil];

NSArray *array2 = [NSArray arrayWithObjects:@"mac",@"imac",@"mac pro",nil];

//类方法初始化自动释放

NSDictionary *myDictionary = [NSDictionary dictionaryWithObjectsAndKeys:array1,@"mobile",array2,@"computers",nil];//注意用nil结束

NSLog(@"myDictionary = %@",myDictionary);

int dictSize = [myDictionary count];

//访问字典中的值

NSArray *mobile = [myDictionary objectForKey:@"mobile"];

//从一个对象获取键

NSArray *keys = [myDictionary allKeysForObject:array1];

//获取字典中所有值得一个数组

NSArray *values = [myDictionary allValues];

//快速枚举

for(id key in myDictionary)

{

NSLog(@"key: %@,value: %@",key,[myDictionary objectForKey:key]);

}

//如果字典只包含属性列表对象(NSData,NSDate,NSNumber,NSString,NSArray或NSDictionary)可以保存到文件中

NSString *filePath = [[[NSBundlemainBundle]resourcePath]stringByAppendingPathComponent:@"dict.txt"];

BOOL success = [myDictionary writeToFile:filePath atomically:YES];

//用文件填充

NSDictionary *myDict2 =[NSDictionary dictionaryWithContentsOfFile:filePath];

//可变字典

NSMutableDictionary *dictMutable = [[NSMutableDictionary alloc]initWithObjectsAndKeys:array1,@"mobile",array2,@"computer", nil];

NSString *string4 = @"stringTV";

//修改对象

[dictMutable setObject:string4 forKey:@"media"];

//删除对象

[dictMutable removeObjectForKey:@"mobile"];

//删除多个对象

NSArray *keyArray =[NSArray arrayWithObjects:@"mobile",@"computer", nil];

[dictMutable removeObjectForKey:keyArray];

//删除所有对象

[dictMutable removeAllObjects];

注: iOS 6 新的快捷初始化写法:

NSDictionary:

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NSDictionary *dic = @{@"键":@"值",@"键1":@"值1"};

NSMutableDictionary:

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NSMutableDictionary *MDic = [@{@"键":@"值",@"键1":@"值1"} mutableCopy];

1:基础初始化

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NSMutableDictionary *muDicAsyncImage = [[NSMutableDictionary alloc] init];

2:为字典添加对象(键与值都是 id 接受任何类型)

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[muDicAsyncImage setObject:@"值" forKey:@"键"];

3:通过键取得值对象

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NSString *str= [muDicAsyncImage objectForKey:@"键"];

4:删除某个对象

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[ muDicAsyncImage removeObjectForKey: @"键"];

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NSDictionary 使用总结

NSDictionary 使用总结

​​NSDictionary使用小结​​

​​NSDictionary 使用总结​​

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NSDictionary使用小结

NSDictionary 使用总结