创建并循环遍历数组bools

Question

我正在创建一个拼图应用程序。当每一块被触摸时，想法是如果它被放置在正确的位置，则bool（droppedInPlace）被分配YES，并且如果被放置在错误的位置则被配置为NO。然后我想我需要创建一个40个布尔（拼图块的数量）的数组，每个条目最初都会被设置为NO。

然后使用replaceObjectAtIndex将此bool（droppedInPlace）插入到一个数组中。然后我想循环这个数组。如果所有条目均为true/yes/1，则拼图完成，我将运行一些代码。

我在做这个时遇到了一些麻烦。我无法弄清楚如何编码我的想法。下面是我的代码：

-(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]; 
} 
} 

和校验功能：

-(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

你想知道如何循环访问数组？您可以使用for(;;)环或for(.. in ..)循环或，我最喜欢了这样的事情：-enumerateObjectsUsingBlock:

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

Answer 2

请注意，您的piecesInPlace阵列是不是在方法checkJigsawCompleted初始化，并会崩溃下一行。

假设它是正确的值初始化，检查是否所有的值是true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 3

所以，几件事情。首先，你要根据拼图的标签替换这个piecesInPlace可变数组中的对象，它看起来像。虽然你从来没有设置这些视图的标签。所以，这条线：

int tag = touchedView.tag; 

将始终为0更糟的是，你的replaceObjectAtIndex：标签1位将试图访问不是阵列（此时的-1指数，但会一旦苹果公司做出一些改变）合法。

至于刚刚通过数组循环，并检查一个真正的价值，我会建议使用方法

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

利用这一点，你可以设置止损指针是一旦你找到一个没有价值在你的数组中枚举将结束。只要停止为NO，您只想继续枚举。如果你在不停止的情况下通过你的数组，所有的值都是YES。