NSMutableArray 多维，removeAllObjects？

Question

ObjC w/ARC

在我将 NSMutableArray 的新实例重新分配给它之前，我是否需要在先前初始化的 NSMutableArray（设置为多维，顺便说一句）上调用 removeAllObjects？

考虑：

@interface MyClass
@property(strong) NSMutableArray *myArray;
@end

@implementation MyClass

-(instancetype)init {

    if (self = [super init]) {
        [self initializeMyArrayWithData]  // once
        [self initializeMyArrayWithData]  // twice
    } 
    return self;
}

-(void)initializeMyArrayWithData {
    NSMutableArray *temp = [NSMutableArray arrayWithCapacity:8];
    for (int row = 0; row < 8; row++) {
        [temp addObject: [NSMutableArray arrayWithCapacity:8]];
        for (int col = 0; col < 8; col++) {
            [[temp objectAtIndex:row] insertObject:@"TEST" atIndex:col];
        }
    }

    // let's assume my array was previously initialized
    // with this method. Do I need to "clean-up" the previous
    // instance by removing all objects within it, or will
    // this be handled automatically by the property method using
    // the following simple assignment?

    self.MyArray = temp;
}
@end

Answer 1

不，您不必这样做。下面是发生的事情：ARC 将告诉 self.MyArray 中引用的 NSMutableArray 的当前实例它已被释放。假设它是唯一的引用，数组将开始释放它的内容，释放它的每个对象。

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