Question

我正在创建一个拼图应用程序。触摸每一件作品时，我们的想法是，如果布尔（droppedInPlace）放在正确的位置，则{（1}}）被分配YES;如果放在错误的位置，则NO。然后我想我需要创建一个包含40个bool（拼图块数）的数组，这些条目中的每一个都将初始设置为NO。

然后使用droppedInPlace将此bool（replaceObjectAtIndex）插入到数组中。然后我想循环遍历这个数组。如果所有条目都为真/是/ 1，则拼图完成，我将运行一些代码。

我在做这件事时遇到了一些麻烦。我无法弄清楚如何在上面编写我的想法。以下是我的代码：

-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
UIView *touchedView = [touch view];
// filename to be read from
NSString *filePath = [[NSBundle mainBundle]
                      pathForResource: 
                      @"jigsawHomeCenterPoints" 
                      ofType:@"plist"];
// array of cgpoints in string format
NSArray *jigsawHomeCentersArray = [NSArray arrayWithContentsOfFile:filePath];
// the tag number of the selected image
int tag = touchedView.tag;
NSLog(@"tag: %i", tag);
// says that the piece has not been dropped in it's holder
bool droppedInPlace = NO;
// if what has been touched is part of the array of images
if ([imagesJigsawPieces indexOfObject:touchedView] != NSNotFound) {
    // preparing new snap-to-center position
    // using (tag-1) as an index in the HomeCentersArray corresponds to where the image should be placed
    // this was a conscious decision to make the process easier
    CGPoint newcenter = CGPointFromString([jigsawHomeCentersArray objectAtIndex:tag-1]);
    // the location of the current touch
    CGPoint location = [touch locationInView:self.view];
    // call the animate method upon release
    [self animateReleaseTouch:touchedView withLocation:location];
    // setting a proximity range - if it is within this 80x80 area the image will snap to it's corresponding holder (HomeCenter)
    if (location.x > newcenter.x-40 && location.x < newcenter.x+40 
        && location.y > newcenter.y-40 && location.y < newcenter.y+40) {
        touchedView.center = newcenter;
        touchedView.alpha = 1.0;
        droppedInPlace = YES;
    } else {
        touchedView.alpha = 0.5;
        droppedInPlace = NO;
    }
    NSLog(@"True or false: %i", droppedInPlace);
[self checkJigsawCompleted:droppedInPlace withTag:tag];
}
}

检查功能：

-(void) checkJigsawCompleted:(BOOL)inPlace withTag:(NSInteger)tag {
NSMutableArray *piecesInPlace;
[piecesInPlace replaceObjectAtIndex:tag-1 withObject:[NSNumber numberWithBool:inPlace]];
//code to loop through array - check if all entries are true/yes/1
//if so, jigsaw is completed - run some other code
//else, do nothing
}

Answer 1

请注意，您的piecesInPlace数组未在方法checkJigsawCompleted中初始化，并且会在下一行崩溃。

假设它使用正确的值初始化，检查所有值是否为真的方法很简单：

for (NSNumber *boolNumber in piecesInPlace) {
    if (![boolNumber boolValue])
       return false;
}

return true;

编辑：或更好：

return ![piecesInPlace containsObject:[NSNumber numberWithBool:NO]];

Answer 2

您想知道如何遍历数组吗？你可以使用for(;;)循环或for(.. in ..)循环，或者我喜欢的这类东西：-enumerateObjectsUsingBlock:

__block jigsawIsComplete = true;
[piecesInPlace enumerateObjectsUsingBlock: ^(id obj, NSUInteger i, BOOL* stop)
    {
        jigsawIsComplete = jigSawIsComplete && [obj boolValue];
        *stop = !jigsawIsComplete;
    }];

Answer 3

所以，有些事情。首先，你要根据拼图块的标签替换这些piecesInPlace可变数组中的对象，它看起来像。但是，您永远不会设置这些视图的标记。所以，这一行：

int tag = touchedView.tag;

总是为0.更糟糕的是，你的replaceObjectAtIndex：tag-1位将尝试访问数组的-1索引（此时，但Apple将公开更改一些）合法。

只要循环遍历数组并检查真值，我建议使用方法

- (void)enumerateObjectsUsingBlock:(void (^)(id obj, NSUInteger idx, BOOL *stop))block

使用此功能，只要在数组中找到NO值并且枚举结束，就可以将停止指针设置为YES。只要stop为NO，您只想继续枚举。如果您在不停止的情况下通过阵列，则所有值均为YES。

创建并循环遍历bool数组

3 个答案: