Question

我不知道我今天是否完全脑筋进化了,或者是什么。但基本上我正试图启动一个NSMMMDD词典,以便使用。我把它作为一个财产:

@property (nonatomic, retain) NSMutableDictionary *baseViewDictionary;

.m 文件 :

@synthesize baseViewDictionary;



// in the init method:
    NSMutableDictionary *tempDict = [[NSMutableDictionary alloc] initWithCapacity:0];
    self.baseViewDictionary = tempDict;
    [self.baseViewDictionary setObject:@"test" forKey:[NSNumber numberWithInteger:0]];
    [tempDict release];

我以为这是一个用于初始化 NSM 运算的图案。不幸的是, 我的自我. base View 词典从未被设置过。我的临时数据仪在调试器里有一对密钥/ 价值配对, 但我的自我。 base View 词典有 0x00000 。因此它就像 :

self.baseViewDictionary = tempDict;

永远无法运行。当我步入代码行时, 它跳到@ synthesize size base ViewDictoinary, 然后返回到 self. baseViewDicctionary=tempDict 线。

s 这里的调试器在 setObject@ "test" 运行后的照片。

""https://i.sstatic.net/cYLX9.png" alt="此处输入图像描述"/ >

Answer 1

Your pattern is correct.
The initialization is done right, no memory leak as you release the dictionary after the assignation to the property, which retains it.

Are your sure your init method is correct?
I mean, calling self = [ super init ] (not ==), doing your stuff after this, and returning self?

似乎显而易见,但因为您的实例变量似乎是 nil , self 也可能是 nil ...

- ( id )init
{
    if( ( self = [ super init ] ) )
    {
        NSMutableDictionary * tempDict = [ [ NSMutableDictionary alloc ] initWithCapacity: 0 ];
        self.baseViewDictionary        = tempDict;

        [ self.baseViewDictionary setObject: @"test" forKey: [ NSNumber numberWithInteger: 0 ] ];
        [ tempDict release ];

        NSLog( @"%@", self.baseViewDictionary );
    }

    return self;
}

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