如何更改NSMutableArray的NSNumber值？

Question

我試圖更改NSMutableArray中的NSNumber值。

怎么做？

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    NSMutableArray *_numArray = [[NSMutableArray alloc] init];
    [_numArray addObject:[NSNumber numberWithBool:YES]];
    [_numArray addObject:[NSNumber numberWithBool:YES]];
    [_numArray addObject:[NSNumber numberWithBool:YES]];


    for (NSNumber *_numObject in _numArray) {
        // How to change all NSNumber Object from YES to NO?
        _numObject = [NSNumber numberWithBool:NO]; // <== Is this correct?
    } 
}

Answer 1

您問題中的代碼除循環變量的值外不會更改任何其他內容。

您需要像這樣替換數組中的值：

[_numArray replaceObjectAtIndex:1 withObject:@NO];

或者，如果您要全部替換，請執行以下操作：

for (NSInteger i = 0; i < _numArray.count; i++) {
    [_numArray replaceObjectAtIndex:i withObject:@NO];
}