数组中不能存放基本数据类型，必须存放对象，因此如果要存放基本数据类型，先进行NSTimer封装
NSArray的用法：
第一、初始化
NSArray *firstArray=[[NSArray alloc] initWithObjects:@"one",@"two",@"three", nil];
NSArray *secondArray=[NSArray arrayWithArray:firstArray];
第二、获取元素个数和访问
NSLog(@"the number is %ld",[secondArray count]);
NSLog(@"the value is %@",[secondArray objectAtIndex:2]);
第三、追加数据元素
NSArray *thirdArray=[firstArray arrayByAddingObjectsFromArray:secondArray];
第四、数组转化为字符串
NSString *str=[firstArray componentsJoinedByString:@".."];
NSLog(@"the number is %@",str);
第五、判断是否包含字符串
NSArray *firstArray=[[NSArray alloc] initWithObjects:@"one",@"two",@"three", nil];
NSLog(@"has value %d",[firstArray containsObject:@"two"]);
NSLog(@"has value %ld",[firstArray indexOfObject:@"two"]);
NSLog(@"the last object is %@",[firstArray lastObject]);
NSMutalbeArray 的用法-
第一、基本的增删改
NSMutableArray *mutableArr=[NSMutableArray arrayWithCapacity:4];
[mutableArr addObject:@"hello"];
[mutableArr addObject:@"hello"];
[mutableArr addObject:@"hello"]; [mutableArr addObject:@"richard"];
[mutableArr insertObject:@"yang" atIndex:1];
NSLog(@"%@",mutableArr);
[mutableArr removeObject:@"hello"];
[mutableArr removeObjectAtIndex:0];
[mutableArr removeLastObject];
NSLog(@"%@",mutableArr);
第二、替换操作
[mutableArr replaceObjectAtIndex:0 withObject:@"kaixin"];
第三、遍历
NSMutableArray *mutableArr=[NSMutableArray arrayWithCapacity:4];
[mutableArr addObject:@"hello"];
[mutableArr addObject:@"hello"];
[mutableArr addObject:@"hello"];
for(int index=0;index<[mutableArr count];index++)
{
NSLog(@"the val is %@",[mutableArr objectAtIndex:index]);
}
for(NSString *str in mutableArr)
{
NSLog(@"%@",str);
}
for (id str in mutableArr) {
NSLog(@"%@",str);
}