OC语言学习05-数组的操作

来源：互联网发布：沪江网络课程编辑：程序博客网时间：2024/06/07 08:37

#import <Foundation/Foundation.h>

int main(int argc,const char * argv[]) {

@autoreleasepool {

//数组的添加

NSArray *array1 = [NSArrayarrayWithObjects:@"one",@"two",nil];

NSLog(@"array1 = %@", array1);

//给数组添加一个元素需要接收该方法返回值

//不是直接添加而是临时创建一个新的数组

array1 = [array1 arrayByAddingObject:@"three"];

NSLog(@"array = %@", array1);

//给数组添加多个元素

array1 = [array1 arrayByAddingObjectsFromArray:@[@"four",@"five", @"six"]];

NSLog(@"array1 = %@", array1);

//数组的提取

//提取数组中指定范围的元素

NSArray *subArray1 = [array1subarrayWithRange:NSMakeRange(2,3)];

NSLog(@"subArray1 = %@",subArray1);

//创建一个可变的下标集合对象

NSMutableIndexSet *indexSet = [NSMutableIndexSetindexSetWithIndex:1];

//给一个可变集合对象添加元素

[indexSet addIndex:3];

[indexSet addIndex:4];

NSArray *subArray2 = [array1objectsAtIndexes:indexSet];

NSLog(@"subArray2 = %@", subArray2);

//以字符串整体进行分割

NSString *str =@"get out the way";

NSArray *array2 = [strcomponentsSeparatedByString:@" "];

NSLog(@"array2 = %@", array2);

//自定义分割符进行分割

// NSString *str1 = @"get :out :the :way";

// NSString *array3 = [str1 componentsSeparatedByString:@" :"];

// NSLog(@"array3 = %@", array3);

//数组的遍历

NSArray *sortArray =@[@"hello",@"how", @"are",@"you", @"today"];

//方法一通过数组元素的下标进行遍历数组

NSInteger cnt = [sortArraycount];

for (NSInteger i =0; i < cnt; i++) {

NSLog(@"%@", [sortArrayobjectAtIndex:i]);

}

//方法二：枚举器法

//创建一个倒序的枚举器

NSEnumerator *reverseEnum = [sortArrayreverseObjectEnumerator];

id obj =nil;

while(obj = [reverseEnumnextObject]) {

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

}

//创建一个正序的枚举器

NSEnumerator *enumerator = [sortArrayobjectEnumerator];

id obj2 =nil;

while (obj2 = [enumeratornextObject]) {

NSLog(@"obj2 = %@", obj2);

}

//方法三快速枚举法

//判断

for (id obj3in sortArray) {

NSLog(@"快速枚举法 obj3 = %@", obj3);

}

return0;

}

阅读全文

0 0