內存泄漏NSBlockOperation

Question

我用該操作內聲明的對象聲明了NSBlockOperation。 由於內存問題，我的應用程序經常崩潰。 贊賞任何提示並對此進行了很好的解釋，花費了幾個小時仍然沒有成功。

運行時：內存問題-（5種泄漏類型）：1個NSExactBlockVariable實例泄漏

- (EMUserInfoOperation*)loadingLocalModelOperationWithColor:(EMOutfitColor)outfitColor gender:(EMGender)gender {

__block EMUserInfoOperation* operation = [EMUserInfoOperation blockOperationWithBlock:^{
    NSURL* remoteURL = [NSURL URLWithString:self.settings[kEMRemoteUrlKey]];

    EMOutfitModel* model = nil;

    if (remoteURL == nil) {
        model = [[EMDomainDataLoader sharedLoader] loadEmbededOutfitNamed:self.name gender:gender];
    } else {
        model = [[EMDomainDataLoader sharedLoader] loadCachedOutfitNamed:self.name withVersion:self.version gender:gender];
    }
    [model syncApplyTextureFromPath:[self texturePathForColor:outfitColor] textureSampler:EMTextureSamplerColor];

    NSString *alphaPath = [self texturePathForAlpha];
    if(alphaPath.length > 0) {
        [model syncApplyTextureFromPath:alphaPath textureSampler:EMTextureSamplerAlpha];
    }

    operation.userInfo = model;
}];

return operation;
}

Answer 1

我猜想您的EMUserInfoOperation對象對創建操作的塊有很強的引用。 並且此塊還具有對EMUserInfoOperation對象的強大引用，因為它捕獲了operation變量。 因此，您有一個保留周期。

通過執行以下操作，可以使該塊僅弱引用EMUserInfoOperation對象：

EMUserInfoOperation* operation;
__block __weak typeof(operation) weakOperation;
weakOperation = operation = [EMUserInfoOperation blockOperationWithBlock:^{
    typeof(operation) strongOperation = weakOperation;
    if (strongOperation) {

        // ...

        strongOperation.userInfo = model;
    }
}];
return operation;