NSMutableArray的用法

最新推荐文章于 2018-04-06 19:09:58 发布

转载最新推荐文章于 2018-04-06 19:09:58 发布 · 1.5k 阅读

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#NSMutableArray

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本文介绍了如何使用Objective-C中的NSMutableArray进行基本操作，包括初始化数组并指定容量、在数组末尾添加对象、删除指定索引处的对象以及数组的枚举方法等。

/*--------------- 给数组分配容量----------------*/
    NSArray *array;
    array = [NSMutableArray arrayWithCapacity:20];



    /*-------------- 在数组末尾添加对象----------------*/
    - (void) addObject: (id) anObject;
    NSMutableArray *array = [NSMutableArray arrayWithObjects:
    @"One",@"Two",@"Three",nil];
    [array addObject"Four"];
    NSLog(@"array:%@",array);



    /*-------------- 删除数组中指定索引处对象----------------*/    
    -(void) removeObjectAtIndex: (unsigned) index;    
    NSMutableArray *array = [NSMutableArray arrayWithObjects:
    @"One",@"Two",@"Three",nil];
    [array removeObjectAtIndex:1];
    NSLog(@"array:%@",array);



    /*------------- 数组枚举---------------*/    
    - (NSEnumerator *)objectEnumerator;//从前向后
    NSMutableArray *array = [NSMutableArray arrayWithObjects:
    @"One",@"Two",@"Three",nil];
    NSEnumerator *enumerator;
    enumerator = [array objectEnumerator];

    id thingie;
    while (thingie = [enumerator nextObject]) {
        NSLog(@"thingie:%@",thingie);
    }


    - (NSEnumerator *)reverseObjectEnumerator;//从后向前
    NSMutableArray *array = [NSMutableArray arrayWithObjects:
    @"One",@"Two",@"Three",nil];
    NSEnumerator *enumerator;
    enumerator = [array reverseObjectEnumerator];

    id object;
    while (object = [enumerator nextObject]) {
        NSLog(@"object:%@",object);
    }


    //快速枚举
    NSMutableArray *array = [NSMutableArray arrayWithObjects:
    @"One",@"Two",@"Three",nil];
    for(NSString *string in array)
    {
        NSLog(@"string:%@",string);
    }