- /*---------------------NSArray---------------------------*/
- //创建数组
- NSArray *array1 = [NSArray arrayWithObject:@"1"];
- NSArray *array2 = [NSArray arrayWithObjects:@"1",@"2",@"3", nil];
- NSArray *array3 = [NSArray arrayWithArray:array2];
- NSLog(@"array1 = %@",array1);
- NSLog(@"array2 = %@",array2);
- NSLog(@"array3 = %@",array3);
- //获取数组内数据个数
- int count = [array2 count];
- NSLog(@"array2 size is %d",count);
- //访问数组内的数据
- NSString *str1 = [array2 objectAtIndex:0];
- NSLog(@"array2 first content is %@",str1);
- //数组中插入数据 返回新的数组
- NSArray *array4 = [array3 arrayByAddingObject:@"4"];
- NSLog(@"array4 = %@",array4);
- //数组内的数据以制定字符连接
- NSString *str2 = [array4 componentsJoinedByString:@","];
- NSLog(@"str2 = %@",str2);
- //判断数组中是否包含某对象
- BOOL b1 = [array4 containsObject:@"4"];
- BOOL b2 = [array4 containsObject:@"5"];
- NSLog(@"b1 = %d,b2 = %d",b1,b2);
- //取数组内制定对象的索引
- int index = [array4 indexOfObject:@"4"];
- NSLog(@"index = %d",index);
- NSString *str3 = [array4 lastObject];
- NSLog(@"array4 last object is %@",str3);
- /*-----------------------可变数组NSMutableArray-----------------------------------------*/
- //初始化数组 指定数组长度 但可变
- NSMutableArray *mArray1 = [NSMutableArray arrayWithCapacity:5];
- //向数组中添加元素
- [mArray1 addObject:@"aaaa"];
- [mArray1 addObject:@"cccc"];
- NSLog(@"mArray1 = %@",mArray1);
- //向指定位置插入元素
- [mArray1 insertObject:@"bbbb" atIndex:1];
- [mArray1 insertObject:@"dddd" atIndex:[mArray1 count]];
- [mArray1 insertObject:@"eeee" atIndex:[mArray1 count]];
- NSLog(@"mArray1 = %@",mArray1);
- //移除元素
- [mArray1 removeObject:@"eeee"];
- NSLog(@"mArray1 = %@",mArray1);
- [mArray1 removeObjectAtIndex:[mArray1 count]-1];
- NSLog(@"mArray1 = %@",mArray1);
- NSArray *array5 = [NSArray arrayWithObjects:@"bbbb",@"cccc", nil];
- [mArray1 removeObjectsInArray:array5];
- NSLog(@"mArray1 = %@",mArray1);
- //向数组内插入数组
- NSMutableArray *mArray2 = [NSMutableArray arrayWithObjects:@"aaaa",@"aaaa", nil];
- [mArray2 addObject:@"bbbb"];
- NSLog(@"mArray2 = %@",mArray2);
- [mArray2 addObjectsFromArray:array4];
- NSLog(@"mArray2 = %@",mArray2);
- //替换元素
- [mArray2 replaceObjectAtIndex:[mArray2 count]-1 withObject:@"5"];
- NSLog(@"mArray2 = %@",mArray2);
- //遍历数组 常规方法:性能较低
- NSArray *array6 = [NSArray arrayWithObjects:@"a",@"b",@"c",@"d",@"e", nil];
- int len = [array6 count];
- for (int i=0; i<len; i++) {
- NSString *value = [array6 objectAtIndex:i];
- NSLog(@"array6 %d content is %@",i,value);
- }
- //枚举遍历 相当于java中的增强for循环
- for (NSString *string in array6) {
- NSLog(@"array6 content is %@",string);
- }
- NSLog(@"-----------------------");
- //当不确定数组元素类型时
- for(id string in array6){
- NSLog(@"array6 content is %@",string);
- }
时间： 2024-10-21 06:53:22