比較NSInteger和NSUInteger

Question

我需要比較兩個變量，以檢查數組中是否存在索引： indexPath.row是NSInteger [self arrayOfData].count indexPath.row是NSUInteger

問題是它們的類型不同，當indexPath.row = -1時，它會自動轉換為18446744073709551615（無符號長），這是我要避免的。

如何檢查由NSIndexPath的行定義的索引在NSArray是否存在？

碼：

- (void) checkIfIndexExists:(NSIndexPath*) indexPath inArray:(NSArray*)arrayOfData {
    if (indexPath.row >= [self arrayOfData].count) {  // indexPath.row=-1 gets interpretted as 18446744073709551615 (unsigned long)
        DDLogDebug(@"Warning: Index doesn't exist {%@}", indexPath);
        return;
    }
}

Answer 1

這是我如何鑄造解決了這個問題unsigned long到long

- (void) checkIfIndexExists:(NSIndexPath*) indexPath inArray:(NSArray*)arrayOfData {
    if (indexPath.row >= (long) [self arrayOfData].count) {  // indexPath.row=-1 gets interpretted as 18446744073709551615 (unsigned long)
        DDLogDebug(@"Warning: Index doesn't exist {%@}", indexPath);
        return;
    }
}