如何减去两个NSUInteger变量？

Question

有没有办法用Objective-C减去两个或更多NSUInteger值？

这是我的代码

__block NSUInteger *removedElementsCount = 0;
__block BOOL lastIsSuperElement = NO;
// Get the elements not collapsed
[_elements enumerateObjectsUsingBlock:^(id  __nonnull obj, NSUInteger idx, BOOL * __nonnull stop) {
    if (_isHidingSubElementsBlock(obj)){
        //_collapseSubCellsAtIndexPathBlock(idx+_elementsOffset);
        [elementToRemove addObject:(Task *)obj];
        lastIsSuperElement = YES;
        [indexPathToRemove addObject:[NSIndexPath indexPathForRow:(idx-removedElementsCount) inSection:0]];
        removedElementsCount = 0;
    } else if (lastIsSuperElement){
        removedElementsCount++;
        lastIsSuperElement = NO;
    }
}];

当我尝试使用idx-removedElementsCount创建新的NSIndexPath时,出现以下错误:

HTReorderTableCells.m:231:75: Invalid operands to binary expression ('NSUInteger' (aka 'unsigned int') and 'NSUInteger *' (aka 'unsigned int *'))

我找了一个解决方案,但我没找到任何东西.

Answer 1

使用NSInteger作为解决方案.

NSUInteger value1 = 5;
NSUInteger value2 = 3;
NSInteger subs = value1 - value2;

在你的代码中修复声明removedElementsCount(删除*)