NSMutableArray常见用法

#import <Foundation/Foundation.h>

@interface Person : NSObject
@end
@implementation Person
@end

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

/* 数组可以包括任意类型 */
Person *p = [[Person alloc] init];
NSMutableArray *arr1 = [[NSMutableArray alloc] initWithObjects: @"One String", @"Two", @"Three", p, nil];

/* 数组中的每个对象实际是该对象的地址 */
/* NSLOG打印时,调用的是对象的description方法,字符串返回本身，对象为多个C类型字符串则返回时包含双引号 */
NSLog(@"arr1-%@", arr1);

/* 利用已知数组初始化新数组 */
NSMutableArray *arr2 = [[NSMutableArray alloc] initWithArray: arr1];
/* 利用已知数组初始化时的地址浅拷贝 */
NSMutableArray *arr3 = [[NSMutableArray alloc] initWithArray: arr1 copyItems: NO];

/* 生成空的数组后追加 */
NSMutableArray *arr4 = [[NSMutableArray alloc] init];
[arr4 addObject:@"First String"];
[arr4 addObject:@"Second"];

/* 使用枚举器遍历数组 */
NSEnumerator *enumarator = [arr2 objectEnumerator];
id anObject;
while (anObject = [enumarator nextObject]) {
NSLog(@"arr2 object-%@", anObject);
}

/* 快速遍历法 */
for (anObject in arr3)
{
NSLog(@"arr3 object--%@", anObject);
}

/* i遍历法 */
NSInteger i = 0;
for ( ; i < [arr4 count]; i++)
{
NSLog(@"arr4 object---%@", [arr4 objectAtIndex:i]);
}

/* 删除部分或全部元素 */
[arr2 removeObject:@"Two"];
NSLog(@"arr2 is %@", arr2);
[arr2 removeAllObjects];
NSLog(@"arr2 is %@", arr2);
[arr4 removeObject:@"First String"];
NSLog(@"arr4 is %@", arr4);

/* 元素交换 */
[arr3 exchangeObjectAtIndex:0 withObjectAtIndex: 2];
NSLog(@"arr3 is %@", arr3);

/* 注意M.a.c输出时以字符串形式 */
NSString *str1 = @"This is my M.a.c book";
NSArray *arr5 = [str1 componentsSeparatedByString: @" "];
NSLog(@"arr5 is %@", arr5);

/* 逆序 */
NSMutableArray *arr6 = [[NSMutableArray alloc] init];
NSEnumerator *enumra = [arr5 reverseObjectEnumerator];
while (anObject = [enumra nextObject]) {
[arr6 addObject: anObject];
}
NSLog(@"arr6 is %@", arr6);

/* 拼接成字符串 */
NSMutableString *str2 = [[NSMutableString alloc] init];
id obj;
for (obj in arr6)
{
[str2 appendFormat:@"%@ ", obj];
}
NSLog(@"str2 is %@", str2);
}
return 0;
}

2015-11-18 22:39:53.637 TestMutableArray[646:18692] arr1-(
"One String",
Two,
Three,
"<Person: 0x100206a00>"
)
2015-11-18 22:39:53.641 TestMutableArray[646:18692] arr2 object-One String
2015-11-18 22:39:53.641 TestMutableArray[646:18692] arr2 object-Two
2015-11-18 22:39:53.641 TestMutableArray[646:18692] arr2 object-Three
2015-11-18 22:39:53.641 TestMutableArray[646:18692] arr2 object-<Person: 0x100206a00>
2015-11-18 22:39:53.642 TestMutableArray[646:18692] arr3 object--One String
2015-11-18 22:39:53.642 TestMutableArray[646:18692] arr3 object--Two
2015-11-18 22:39:53.642 TestMutableArray[646:18692] arr3 object--Three
2015-11-18 22:39:53.642 TestMutableArray[646:18692] arr3 object--<Person: 0x100206a00>
2015-11-18 22:39:53.642 TestMutableArray[646:18692] arr4 object---First String
2015-11-18 22:39:53.642 TestMutableArray[646:18692] arr4 object---Second
2015-11-18 22:39:53.642 TestMutableArray[646:18692] arr2 is (
"One String",
Three,
"<Person: 0x100206a00>"
)
2015-11-18 22:39:53.643 TestMutableArray[646:18692] arr2 is (
)
2015-11-18 22:39:53.643 TestMutableArray[646:18692] arr4 is (
Second
)
2015-11-18 22:39:53.643 TestMutableArray[646:18692] arr3 is (
Three,
Two,
"One String",
"<Person: 0x100206a00>"
)
2015-11-18 22:39:53.643 TestMutableArray[646:18692] arr5 is (
This,
is,
my,
"M.a.c",
book
)
2015-11-18 22:39:53.643 TestMutableArray[646:18692] arr6 is (
book,
"M.a.c",
my,
is,
This
)
2015-11-18 22:39:53.644 TestMutableArray[646:18692] str2 is book M.a.c my is This