OC中数组的使用方法

#import <Foundation/Foundation.h>

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

{

// 创建数组

NSArray *arr1 = nil;

// NSLog(@"%p", arr1);

NSObject *obj = [NSObject new];

arr1 = [NSArray arrayWithObjects:@"One", @"Two", @"Three",
obj, nil];//结束标识，相当于C语言的“\0”

// NSLog(@"%p", arr1);

NSLog(@"arr1: %@",
arr1);

// 推荐以下的新语法

NSString *str = @"Hello";

NSArray *arr2 = @[@"zhangsan", @"lisi", @"wangwu", @"zhaoliu" ,@"tianqi",
str];//这样的方法自己主动在后面加入了nil

NSLog(@"arr2: %@",
arr2);

// 訪问数组成员 objectAtIndex

// NSObject *tmpObj = [arr1 objectAtIndex:3];

id tmpObj = [arr1 objectAtIndex:3];

NSLog(@"tmpObj: %@",
tmpObj);

// 推荐使用以下的新语法

tmpObj = arr2[2];

NSLog(@"arr2[2]: %@",
tmpObj);

// 可变数组

NSMutableArray *firstArr = [NSMutableArray arrayWithCapacity:30];

// 加入

[firstArr addObject:@"One"];

[firstArr addObject:@"Two"];

[firstArr addObject:@"Three"];

[firstArr addObject:@"Four"];

[firstArr addObject:@"Five"];

NSLog(@"The Mutable Array: %@",
firstArr);

NSMutableArray *secArr = [NSMutableArray arrayWithArray:arr2];

NSLog(@"secArr: %@",
secArr);

// 删除

[secArr removeObject:@"tianqi"];

NSLog(@"==secArr: %@",
secArr);

[secArr removeObjectAtIndex:2];

NSLog(@"===secArr: %@",
secArr);

// 插入

[secArr insertObject:@"wangwu" atIndex:2];//id 是对象
index 是位置

NSLog(@"after insert: %@",
secArr);

// 替换

NSObject *someObj = [NSObject new];

[secArr replaceObjectAtIndex:4 withObject:someObj];

NSLog(@"after replace: %@",
secArr);

// C语言遍历数组

NSUInteger number = [secArr count];

for (int i
= 0; i < number; i++) {

id obj = secArr[i];

NSLog(@"%@",
obj);

}

// 通过枚举器来遍历数组（正着遍历）

NSEnumerator *enum1 = [secArr objectEnumerator];

id obj1;

NSLog(@"*************************");

while (obj1 = [enum1 nextObject])
{

NSLog(@"obj1: %@",
obj1);

}

// 通过枚举器来遍历数组（倒着遍历）
NSEnumerator *enum2 = [secArr reverseObjectEnumerator];

while (obj1 = [enum2 nextObject])
{

NSLog(@"reverse: %@",
obj1);

}

NSLog(@"============================");

// 高速枚举

for (id obj in secArr)
{

NSLog(@"Fast Enumeration: %@",
obj);

}

return 0;

}