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OC中API库常见函数有哪些
更新：HHH 时间：2023-1-7

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NSMutableArray 可变数组

//initWithCapacity: 创建一个数组

// - (instancetype)initWithCapacity:(NSUInteger)numItems

NSMutableArray * array = [[NSMutableArray alloc]initWithCapacity:1];//1表示刚开始给数组分配一个对象大小的内存,当数组已经有一个对象时,再放一个对象时,数组会自动添加1个对象大小的内存,(n代表追加的内存个数). 相同的对象可以被多次存入数组中

NSLog(@"%@", array);

addObject: 给数组中添加元素(对象)

- (void)addObject:(id)anObject

NSMutableArray * array = [[NSMutableArray alloc]initWithCapacity:1];

//1表示刚开始给数组分配一个对象大小的内存,当数组已经有一个对象时,再放一个对象时,数组会自动添加1个对象大小的内存,(n代表追加的内存个数). 相同的对象可以被多次存入数组中

Person * p1 = [[Person alloc]initWithName:@"张1" sex:@"男" age:71];

Person * p2 = [[Person alloc]initWithName:@"李2" sex:@"男" age:22];

Person * p3 = [[Person alloc]initWithName:@"王3" sex:@"女" age:63];

[array addObject:p1];[array addObject:p2];[array addObject:p1];

NSLog(@"%@", array);

//insertObject:atIndex:

[array insertObject:p2 atIndex:2];

NSLog(@"在下标2插入p2%@", array);

//removeLastObject

[array removeLastObject];

NSLog(@"将最后元素删除%@", array);

//removeObject:

[array removeObject:p2];

NSLog(@"将p2元素删除%@", array);

//removeObject:inRange:

[array addObject:p2]; [array addObject:p3];

[array addObject:p1];

NSLog(@"添加后%@", array);

[array removeObject:p1 inRange:NSMakeRange(0, 4)];

NSLog(@"删除给定个范围内出现的对象%@", array);

//removeObjectAtIndex:

[array removeObjectAtIndex:1];

NSLog(@"删除给定下标元素%@", array);

//replaceObjectAtIndex:withObject:

[array replaceObjectAtIndex:0 withObject:p3];

NSLog(@"替换后%@", array);

//exchangeObjectAtIndex:withObjectAtIndex:

[array addObject:p1];[array addObject:p2];

[array exchangeObjectAtIndex:1 withObjectAtIndex:2];

NSLog(@"交换下标1和下标2元素%@", array);

打印结果:

2015-01-15 22:53:04.514 OC 1月15号[3452:303] (

"\U5f201 \U7537 71",

"\U674e2 \U7537 22",

"\U5f201 \U7537 71"

)

2015-01-15 22:53:04.516 OC 1月15号[3452:303] 在下标2插入p2(

"\U5f201 \U7537 71",

"\U674e2 \U7537 22",

"\U5f201 \U7537 71"

)

2015-01-15 22:53:04.517 OC 1月15号[3452:303] 将最后元素删除(

"\U5f201 \U7537 71",

"\U674e2 \U7537 22",

"\U674e2 \U7537 22"

)

2015-01-15 22:53:04.517 OC 1月15号[3452:303] 将p2元素删除(

"\U5f201 \U7537 71"

)

2015-01-15 22:53:04.518 OC 1月15号[3452:303] 添加后(

"\U5f201 \U7537 71",

"\U674e2 \U7537 22",

"\U738b3 \U5973 63",

"\U5f201 \U7537 71"

)

2015-01-15 22:53:04.556 OC 1月15号[3452:303] 删除给定个范围内出现的对象(

"\U674e2 \U7537 22",

"\U738b3 \U5973 63"

)

2015-01-15 22:53:04.556 OC 1月15号[3452:303] 删除给定下标元素(

"\U674e2 \U7537 22"

)

2015-01-15 22:53:04.557 OC 1月15号[3452:303] 替换后(

"\U738b3 \U5973 63"

)

2015-01-15 22:53:04.557 OC 1月15号[3452:303] 交换下标1和下标2元素(

"\U738b3 \U5973 63",

"\U674e2 \U7537 22",

"\U5f201 \U7537 71"

)

Person * p1 = [[Person alloc]initWithName:@"张1" sex:@"男" age:71];

Person * p2 = [[Person alloc]initWithName:@"李2" sex:@"男" age:22];

Person * p3 = [[Person alloc]initWithName:@"王3" sex:@"女" age:63];

NSArray * array = [NSArray arrayWithObjects:p1,p2,p3,@"1111", @"222", nil];

NSLog(@"%@",array);

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

id obj = [array objectAtIndex:i];

//检查对象是否是某个类的对象

// isKindOfClass

if ([obj isKindOfClass:[NSString class]]) {

NSString * newstr = [obj stringByAppendingString:@"蓝鸥"];

NSLog(@"%@", newstr);

}

2015-01-15 22:57:53.527 OC 1月15号[3466:303] (

"\U5f201 \U7537 71",

"\U674e2 \U7537 22",

"\U738b3 \U5973 63",

1111,

222

)

2015-01-15 22:57:53.529 OC 1月15号[3466:303] 1111蓝鸥

2015-01-15 22:57:53.530 OC 1月15号[3466:303] 222蓝鸥

//*************NSNumber***************

//NSNumber 数值类把基本数值型转换成对象性,或者是数值对象转成基本型

//intValue 把对象转化为数值.

// intValue 和 NSNumber numberWithInt: 是一对

int n = 5;

NSNumber * n1 = [NSNumber numberWithInt:n];

NSArray * array = [NSArray arrayWithObjects:n1,[NSNumber numberWithInt:10], nil];

NSLog(@"%@", array);

int result = [[array firstObject] intValue] + [[array lastObject] intValue];

NSLog(@"result = %d", result);

打印结果:

2015-01-15 22:59:36.037 OC 1月15号[3474:303] (

)

2015-01-15 22:59:36.039 OC 1月15号[3474:303] result = 15

//NSDictionary 不可修改的字典

//1. 键值对 2. 字典无序 3. 存对象 4. 通过key索引对应的值 5. key唯一

//initWithObjectsAndKeys:

NSDictionary * dic = [[NSDictionary alloc]initWithObjectsAndKeys:@"张三",@"name",@"男",@"sex",@"25",@"年龄", nil];

NSLog(@"%@", dic);

2015-01-15 23:00:33.258 OC 1月15号[3484:303] {

name = "\U5f20\U4e09";

sex = "\U7537";

"\U5e74\U9f84" = 25;

}

NSDictionary * dic = [NSDictionary dictionaryWithObjectsAndKeys:@"zhangsan",@"name", @"M",@"sex", @"30", @"age", nil];

NSLog(@"%@", dic);

//dictionaryWithObjects:forKeys: 类方法,将值和键分别对应,返回一个字典

//+ (instancetype)dictionaryWithObjects:(NSArray *)objectsforKeys:(NSArray *)keys

NSArray * arrayValue = [NSArray arrayWithObjects:@"zhangsan",@"30",@"W", nil];

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

NSDictionary * dic1 = [NSDictionary dictionaryWithObjects:arrayValue forKeys:keyArray];

NSLog(@"%@", dic1);

//count //得到键值对的个数

NSLog(@"%ld",[dic1 count]);

//allKeys 得到所有的键

NSLog(@"%@",[dic1 allKeys]);

//allValues 得到所有的值

NSLog(@"%@", [dic1 allValues]);

打印结果:

2015-01-15 23:01:17.213 OC 1月15号[3492:303] {

age = 30;

name = zhangsan;

sex = M;

}

2015-01-15 23:01:17.216 OC 1月15号[3492:303] {

age = 30;

name = zhangsan;

sex = W;

}

2015-01-15 23:01:17.216 OC 1月15号[3492:303] 3

2015-01-15 23:01:17.217 OC 1月15号[3492:303] (

name,

age,

sex

)

2015-01-15 23:01:17.217 OC 1月15号[3492:303] (

zhangsan,

30,

)

//**************************objectForKey: 重要***********************************//

//objectForKey: 根据Key来索引数据

//- (id)objectForKey:(id)aKey

NSArray * arrayValue = [NSArray arrayWithObjects:@"zhangsan",@"30",@"W", nil];

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

NSDictionary * dic1 = [NSDictionary dictionaryWithObjects:arrayValue forKeys:keyArray];

NSString * str = [dic1 objectForKey:@"name"];

NSLog(@"%@", str);

//遍历字典,取出字典所有的值

for (int i = 0; i < [dic1 count]; i++) {

NSString * key = [[dic1 allKeys] objectAtIndex:i];

NSString * value = [dic1 objectForKey:key];

NSLog(@"遍历1 %@", value);

}

//遍历2

NSArray * array = [dic1 allValues];

for (int i= 0; i < [dic1 count]; i++) {

NSString * str = array[i];

NSLog(@"遍历2 %@", str);

}

2015-01-15 23:05:29.028 OC 1月15号[3524:303] zhangsan

2015-01-15 23:05:29.030 OC 1月15号[3524:303] 遍历1 zhangsan

2015-01-15 23:05:29.031 OC 1月15号[3524:303] 遍历1 30

2015-01-15 23:05:29.031 OC 1月15号[3524:303] 遍历1 W

2015-01-15 23:05:29.032 OC 1月15号[3524:303] 遍历2 zhangsan

2015-01-15 23:05:29.032 OC 1月15号[3524:303] 遍历2 30

2015-01-15 23:05:29.032 OC 1月15号[3524:303] 遍历2 W

//************************** NSMutableDictionary*********************

// NSMutableDictionary

// dictionaryWithCapacity: 创建一个可以修改内容的字典

// 一个Key对应一个value

// 一个value可以对应多个key

NSMutableDictionary * dic = [NSMutableDictionary dictionaryWithCapacity:1];

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

//setObject:forKey: 往字典里添加键值对

//- (void)setObject:(id)anObjectforKey:(id<NSCopying>)aKey

[dic setObject:@"zhangsan" forKey:@"name"];

[dic setObject:@"zhangsi" forKey:@"name"];//键一样时 , 会将键指的内容替换掉

[dic setObject:@"20" forKey:@"value1"];

[dic setObject:@"20" forKey:@"value2"];

NSLog(@"%@", dic);

//removeObjectForKey:

[dic removeObjectForKey:@"value2"];

NSLog(@"%@", dic);

// [dic removeAllObjects];

// NSLog(@"%@", dic);

NSArray * array = [NSArray arrayWithObjects:@"value1",@"name" , nil];

[dic removeObjectsForKeys:array]; //移除多个键对应的值

NSLog(@"%@", dic);

2015-01-15 23:08:49.741 OC 1月15号[3538:303] dic = {

}

2015-01-15 23:08:49.743 OC 1月15号[3538:303] {

name = zhangsi;

value1 = 20;

value2 = 20;

}

2015-01-15 23:08:49.744 OC 1月15号[3538:303] {

name = zhangsi;

value1 = 20;

}

2015-01-15 23:08:49.744 OC 1月15号[3538:303] {

}

//*************************OC之二维数组***********************//

NSArray * firstArray = [NSArray arrayWithObjects:@"111", @"222", @"333", @"444", nil];

NSArray * secondArray = [NSArray arrayWithObjects:@"AAA", @"BBB", @"CCC", nil];

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

NSArray * bigArray = [NSArray arrayWithObjects:firstArray, secondArray,thirdArray, nil];

NSLog(@"%@", bigArray);

// 1 遍历数组(两层循环, 数组里面套数组)

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

for (int j = 0; j < [[bigArray objectAtIndex:i] count]; j++) {

id a = [[bigArray objectAtIndex:i] objectAtIndex:j];

NSLog(@"遍历数组之结果:%@", a);

}

2015-01-15 23:09:37.710 OC 1月15号[3546:303] (

(

111,

222,

333,

444

(

AAA,

BBB,

CCC

(

name,

sex,

age

)

2015-01-15 23:09:37.713 OC 1月15号[3546:303] 遍历数组之结果:111

2015-01-15 23:09:37.713 OC 1月15号[3546:303] 遍历数组之结果:222

2015-01-15 23:09:37.713 OC 1月15号[3546:303] 遍历数组之结果:333

2015-01-15 23:09:37.714 OC 1月15号[3546:303] 遍历数组之结果:444

2015-01-15 23:09:37.714 OC 1月15号[3546:303] 遍历数组之结果:AAA

2015-01-15 23:09:37.715 OC 1月15号[3546:303] 遍历数组之结果:BBB

2015-01-15 23:09:37.715 OC 1月15号[3546:303] 遍历数组之结果:CCC

2015-01-15 23:09:37.715 OC 1月15号[3546:303] 遍历数组之结果:name

2015-01-15 23:09:37.716 OC 1月15号[3546:303] 遍历数组之结果:sex

2015-01-15 23:09:37.716 OC 1月15号[3546:303] 遍历数组之结果:age

// 2 数组里面套字典

NSDictionary * stuDic1 = [NSDictionary dictionaryWithObjectsAndKeys:@"zhangsan", @"name", @"M", @"sex",@"30", @"age", nil];

NSDictionary * stuDic2 = [NSDictionary dictionaryWithObjectsAndKeys:@"lisi", @"name", @"M", @"sex", @"25", @"age", nil];

NSArray * array = [NSArray arrayWithObjects:stuDic1, stuDic2, nil];

NSLog(@"%@", array);

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

for (int j = 0; j < [[array objectAtIndex:i] count]; j++) {

id result = [[[array objectAtIndex:i]allValues] objectAtIndex:j];

NSLog(@"遍历后:%@", result);

}

2015-01-15 23:10:27.425 OC 1月15号[3557:303] (

{

age = 30;

name = zhangsan;

sex = M;

{

age = 25;

name = lisi;

sex = M;

}

)

2015-01-15 23:10:27.427 OC 1月15号[3557:303] 遍历后:zhangsan

2015-01-15 23:10:27.427 OC 1月15号[3557:303] 遍历后:M

2015-01-15 23:10:27.428 OC 1月15号[3557:303] 遍历后:30

2015-01-15 23:10:27.428 OC 1月15号[3557:303] 遍历后:lisi

2015-01-15 23:10:27.429 OC 1月15号[3557:303] 遍历后:M

2015-01-15 23:10:27.429 OC 1月15号[3557:303] 遍历后:25

<<3>>字典里放数组

NSArray * firstArray = [NSArray arrayWithObjects:@"111", @"222", @"333", @"444", nil];

NSArray * secondArray = [NSArray arrayWithObjects:@"AAA", @"BBB", @"CCC", nil];

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

NSDictionary * dic = [NSDictionary dictionaryWithObjectsAndKeys:firstArray, @"first",secondArray, @"second",thirdArray, @"third", nil];

NSLog(@"%@", dic);

for (int i = 0; i < [dic count]; i++) {//外层循环遍历字典,

for (int j = 0; j < [[[dic allValues]objectAtIndex:i] count]; j++) {//内层循环遍历小数组

id a = [[[dic allValues] objectAtIndex:i] objectAtIndex:j];//取出数组里的内容

NSLog(@"遍历后%@", a);

}

2015-01-15 23:11:20.271 OC 1月15号[3565:303] {

first = (

111,

222,

333,

444

);

second = (

AAA,

BBB,

CCC

);

third = (

name,

sex,

age

);

}

2015-01-15 23:11:20.274 OC 1月15号[3565:303] 遍历后111

2015-01-15 23:11:20.274 OC 1月15号[3565:303] 遍历后222

2015-01-15 23:11:20.275 OC 1月15号[3565:303] 遍历后333

2015-01-15 23:11:20.275 OC 1月15号[3565:303] 遍历后444

2015-01-15 23:11:20.275 OC 1月15号[3565:303] 遍历后AAA

2015-01-15 23:11:20.276 OC 1月15号[3565:303] 遍历后BBB

2015-01-15 23:11:20.276 OC 1月15号[3565:303] 遍历后CCC

2015-01-15 23:11:20.277 OC 1月15号[3565:303] 遍历后name

2015-01-15 23:11:20.277 OC 1月15号[3565:303] 遍历后sex

2015-01-15 23:11:20.277 OC 1月15号[3565:303] 遍历后age

// 4 字典里套子典

NSDictionary * stuDic1 = [NSDictionary dictionaryWithObjectsAndKeys:@"zhangsan", @"name", @"M", @"sex",@"30", @"age", nil];

NSDictionary * stuDic2 = [NSDictionary dictionaryWithObjectsAndKeys:@"lisi", @"name", @"M", @"sex", @"30", @"age", nil];

NSDictionary * bigDic = [NSDictionary dictionaryWithObjectsAndKeys:stuDic1,@"first", stuDic2, @"second", nil];

NSLog(@"%@", bigDic);

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

//外层循环控制大字典键值对数

for (int j = 0; j < [[[bigDic allValues]objectAtIndex:i] count]; j++) {

//内层循环控制小字典键值对数!!!注意要先取出大字典的值集( allValue ),用objiectAtIndex: 得出小字典,再求小字典的值集,用objiectAtIndex: 求出具体内容

id a = [[[[bigDic allValues]objectAtIndex:i] allValues] objectAtIndex:j];

NSLog(@"遍历字典(里套小字典)后%@", a);

}

2015-01-15 23:12:36.630 OC 1月15号[3573:303] {

first = {

age = 30;

name = zhangsan;

sex = M;

};

second = {

age = 30;

name = lisi;

sex = M;

};

}

2015-01-15 23:12:36.632 OC 1月15号[3573:303] 遍历字典(里套小字典)后zhangsan

2015-01-15 23:12:36.633 OC 1月15号[3573:303] 遍历字典(里套小字典)后M

2015-01-15 23:12:36.633 OC 1月15号[3573:303] 遍历字典(里套小字典)后30

2015-01-15 23:12:36.634 OC 1月15号[3573:303] 遍历字典(里套小字典)后lisi

2015-01-15 23:12:36.634 OC 1月15号[3573:303] 遍历字典(里套小字典)后M

2015-01-15 23:12:36.634 OC 1月15号[3573:303] 遍历字典(里套小字典)后30

以上是“OC中API库常见函数有哪些”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注天达云行业资讯频道！


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