創建並循環遍歷數組bools

Question

我正在創建一個拼圖應用程序。當每一塊被觸摸時，想法是如果它被放置在正確的位置，則bool（droppedInPlace）被分配YES，並且如果被放置在錯誤的位置則被配置爲NO。然後我想我需要創建一個40個布爾（拼圖塊的數量）的數組，每個條目最初都會被設置爲NO。

然後使用replaceObjectAtIndex將此bool（droppedInPlace）插入到一個數組中。然後我想循環這個數組。如果所有條目均爲true/yes/1，則拼圖完成，我將運行一些代碼。

我在做這個時遇到了一些麻煩。我無法弄清楚如何編碼我的想法。下面是我的代碼：

-(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]; 
} 
} 

和校驗功能：

-(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

你想知道如何循環訪問數組？您可以使用for(;;)環或for(.. in ..)循環或，我最喜歡了這樣的事情：-enumerateObjectsUsingBlock:

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

Answer 2

請注意，您的piecesInPlace陣列是不是在方法checkJigsawCompleted初始化，並會崩潰下一行。

假設它是正確的值初始化，檢查是否所有的值是true的方法很簡單：

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

return true; 

編輯：或更好：

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

Answer 3

所以，幾件事情。首先，你要根據拼圖的標籤替換這個piecesInPlace可變數組中的對象，它看起來像。雖然你從來沒有設置這些視圖的標籤。所以，這條線：

int tag = touchedView.tag; 

將始終爲0更糟的是，你的replaceObjectAtIndex：標籤1位將試圖訪問不是陣列（此時的-1指數，但會一旦蘋果公司做出一些改變）合法。

至於剛剛通過數組循環，並檢查一個真正的價值，我會建議使用方法

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

利用這一點，你可以設置止損指針是一旦你找到一個沒有價值在你的數組中枚舉將結束。只要停止爲NO，您只想繼續枚舉。如果你在不停止的情況下通過你的數組，所有的值都是YES。