Question

我遇到NSMutableArray问题。我想创建一个填充mutableArray的循环，最初为空，但Xcode生成两个错误：“从不兼容的类型'void'”分配给“NSMutableArray”，“void值不应该忽略，因为它应该是”。这是代码：

NSMutableArray * arrayToFill =[[NSMutableArray alloc]init];
int i=0;
while (i<4){
    NSDictionary * dictionary =[[NSDictionary dictionaryWithObjectsAndKeys: @"value1", @"key1",@"value2",@"key2", nil];
    arrayToFill =[arrayToFill insertObject:dictionary atIndex:i];
    i++;
 }

Answer 1

更改行：

arrayToFill =[arrayToFill insertObject:dictionary atIndex:i];

到

[arrayToFill insertObject:dictionary atIndex:i];

您无需再次分配，只需调用insert方法

即可

Answer 2

只需删除arrayToFill =

即可

 NSMutableArray * arrayToFill = [NSMutableArray array];
    for (int i = 0; i < 4; i++){
        NSDictionary * dictionary = [NSDictionary dictionaryWithObjectsAndKeys: @"value1",  @"key1", @"value2", @"key2", nil];
        [arrayToFill insertObject: dictionary atIndex: i ];
     }

Answer 3

将第5行更改为：

[arrayToFill insertObject:dictionary atIndex:i];

您无需重新分配arrayToFill

NSMutableArray insertObject：atIndex

3 个答案: