ios - NSArray索引超出范围

Question

我想我会为简单的事情生气。

如下代码:

        NSLog(@"potentialPositions: %@, with count: %i", potentialPositions, [potentialPositions count]);

    for (NSUInteger i = 1; i < (choices); i++) {
        NSLog(@"i = %i",i);
        [self drawAWord:[[currentLevel objectAtIndex:levelLink] objectAtIndex:i] atPoint:[[potentialPositions objectAtIndex:i] CGPointValue] withInitialZoom:FALSE];
    }

产生以下结果:

2014-02-15 20:31:54.329 ThesaurusLinks[12446:70b] potentialPositions: (
"NSPoint: {180, 125}",
"NSPoint: {270, 200}",
"NSPoint: {350, 250}",
"NSPoint: {280, 160}"
), with count: 4
2014-02-15 20:31:54.330 ThesaurusLinks[12446:70b] i = 1
2014-02-15 20:31:54.331 ThesaurusLinks[12446:70b] i = 2
2014-02-15 20:31:54.331 ThesaurusLinks[12446:70b] i = 3
2014-02-15 20:31:54.334 ThesaurusLinks[12446:70b] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 3 beyond bounds [0 .. 2]'

数组中显然有四个对象称为“potentialPositions”。为什么它认为边界只有0..2？当我放置一个NSLOG时，它不能出现在我的DrawAWord方法中(结果未在上面显示)，对于i = 3不会被调用。我很困惑。

感谢您的任何答案或提示。

Answer 1

什么

[currentLevel objectAtIndex:levelLink]

退货？似乎问题出在这里。加

NSLog(@"%@",[currentLevel objectAtIndex:levelLink]);

看看它有多少元素。