比较NSInteger和NSUInteger

Question

为了检查数组中是否存在索引，我需要比较两个变量：indexPath.row is NSInteger [self arrayOfData].count is NSUInteger

问题是它们属于不同的类型，当indexPath.row=-1时，它会自动转换为18446744073709551615 (无符号长整型)，这是我试图避免的。

如何检查NSArray中是否存在由NSIndexPath的行定义的索引

代码：

- (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

下面是我如何通过将unsigned long转换为long来解决该问题的方法

- (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;
    }
}