本文共 2368 字，大约阅读时间需要 7 分钟。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | //数组的创建 NSArray *array1 = [NSArray arrayWithObject:@ "one" ]; NSArray *array2 = [NSArray arrayWithObjects:@ "one" , @ "two" , nil]; NSArray *array3 = [NSArray arrayWithArray:array2]; NSArray *array4 = [[NSArray alloc] initWithArray:array1]; NSLog(@ "%@, %@, %@, %@" , array1, array2, array3, array4); //输出：one one,two one,two one //数组中元素的访问与个数 int count [array2 count]; //输出：count = 2 NSString *string1 = [array2 objectAtIndex:0]; //输出：string = one //追加数组中的内容 NSArray *array5 = [array2 arrayByAddingObject:@ "end" ]; //输出：array5 = one,two,end //数组->字符串 NSString *string2 = [array5 componentsJoinedByString:@ "," ]; //输出：string2 = one,two,end //判断数组中是否存在一个指定的对象 BOOL isContain = [array5 containObject:@ "end" ]; //输出：isContain = 1 //根据指定的对象返回索引下标 NSInteger index = [array5 indexOfObject:@ "end" ]; //输出：index = 2 //返回数组中最后一个元素 NSString *lastObject = [array5 lastObject]; //输出：lastObject = end /*****************可变数组*******************/ //创建一个空的数组 //NSMutableArray *mutableArray1 = [NSMutableArray array]; //NSMutableArray *mutableArray2 = [NSMutableArray arrayWithCapacity:5] //期望大小为5，实际可超过 NSMutableArray *mutableArray3 = [NSMutableArray arrayWithObjects:@ "one" , @ "two" , @ "end" , @ "five" , nil]; //追加一个内容 [mutableArray3 addObject:@ "four" ]; //输出：one, two, four //根据索引插入一个内容 [mutableArray insertObject:@ "three" atIndex:2]; //输出：one, two, three, four //移除最后一个元素 [mutableArray removeLastObject]; //删除指定元素 [mutableArray removeObject:@ "end" ]; //删除指定下标元素 [mutableArray removeObjectAtIndex:3]; //删除指定数组内容 NSMutableArray *deleteArray = [NSMutableArray arrayWithObjects:@ "one" , @ "two" ,nil]; [mutableArray removeObjectInArray:deleteArray]; //替换指定下标元素 [mutableArray replaceObjectAtIndex:2 withObject: "six" ]; //移除所有对象 [mutableArray removeAllObejects]; /*************遍历数组*********************/ //常规遍历（性能较低） NSArray *array = [NSArray arrayWithObjects:@ "a" , @ "b" , @ "c" , nil]; int length = [array count]; for ( int i=0; i<length; i++) { NSString *element = [array objectAtIndex:i]; NSLog(@ "%@" , element); } //快速遍历（性能较高） for (NSString *string in array) NSLog(@ "%@" , string); //当不确定数组的元素的类型时，可以选用id for (id string in array) NSLog(@ "%@" , string); |
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