iOS - 通过方法返回传递NSMutableArray

Question

如何通过方法返回传递NSMutableArray。

我让它传递数组“spaces”，所以10个对象的数组传递10个块，但这些对象中没有包含任何信息。

提前致谢

编辑：基本上我创建了另一个包含路径信息的类，因为我的控制器有点混乱。所以我想要这个新类调用返回NSMutableArray的“create”方法。数组在路径类中很好地创建，但是当return语句触发时，它只传递空格而不是值，甚至是指针。

目前正是

return path;

我试过

return &path; 

而且这种情况不合时宜。

Edit2：不幸的是，这是我遇到的问题。

仍在崩溃

致电

newNode = [newNode copy]; 

导致崩溃

Answer 1

- (NSMutableArray *) mutableFloobizwits {
  NSMutableArray *array = [NSMutableArray array];
  for (NSInteger i = 0; i < TheAnswerToTheUltimateQuestion; ++i) {
    void(^MyBlock)(void) = ^{
      NSLog(@"captured i: %ld", i);
    };
    MyBlock = [MyBlock copy];  //move the block from off the stack and onto the heap
    [array addObject:[Floobizwit floobizwithWithBlock:MyBlock]];
    [MyBlock release]; //the Floobizwit should've -retained the block, so we release it
  }
  return array;
}

Answer 2

我会设置另一个返回路径对象数组的类，如下所示：

@implementation PathFactory

- (NSMutableArray*) create
{
    // In your PathFactory object you create an array and make it autorelease so 
    // it becomes the callers responsibility to free the memory 
    NSMutableArray * pathArray = [[[NSMutableArray alloc] init] autorelease];

    // Create a bunch of PathObject objects and add them to the mutable array
    // also set these to autorelease because the NSMutableArray will retain objects
    // added to the collection (ie It is the NSMutableArray's responsibility to ensure
    // the objects remain allocated).
    for (int i = 0; i < numberOfPaths; i++)
        [pathArray addObject:[[[PathObject alloc] init] autorelease]];

    // Just return the pointer to the NSMutableArray. The caller will need to 
    // call the retain message on the pointer it gets back (see next)
    return pathArray;
}

@end

所以在你的来电代码中：

// create a tempory PathFactory (autorelease will make sure it is cleaned up when we
// are finished here)
PathFactory * newPathFactory = [[[PathFactory alloc] init] autorelease];
// grab the new array of Path objects and retain the memory. _newPathArray
// is a member of this class that you will need to release later.
_newPathArray = [[newPathFactory create] retain];