iphone - 如何消除 Instruments 中发现的泄漏

Question

我刚刚在 Instruments 中运行了 Leaks 工具，发现了以下漏洞：

基本上它指出了 NIAttributedLabel 中的 drawRect，所以我双击了 drawRect 方法，这就是我所拥有的：

我该如何消除这种泄漏？

这是一些代码：

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{

            NSString *commentsText = [NSString stringWithFormat:@"%@ %@", self.imageComment_.username_, self.imageComment_.text_];

            NSRange range;
            range.location = 0;
            range.length = commentsText.length;

            NSMutableAttributedString* attrStr = [[NSMutableAttributedString alloc] initWithString:commentsText];
            [attrStr setFont:[UIFont fontWithName:@"HelveticaNeue" size:14] range:range];
            self.commentAttributedString_ = attrStr;
            [attrStr release];


            dispatch_async(dispatch_get_main_queue(), ^{
                [weakSelf.commentsText_ setAlpha:0.0];
                [weakSelf.commentsPostedTime_ setAlpha:0.0];
                [weakSelf.commentsText_ setFrameWidth:weakSelf.contentView.frameWidth - weakSelf.profilePicture_.frameWidth - kCommentsPadding];
                [weakSelf.commentsText_ setFrameHeight:weakSelf.imageComment_.commentHeight_ - 30];
                [weakSelf.commentsText_ setAttributedString:weakSelf.commentAttributedString_];
                [weakSelf.commentsText_ setLinkColor:weakSelf.textColor_];

                NSString *timePosted = [NSString timestampToString:weakSelf.imageComment_.createdTime_];
                CGSize commentsTimeSize = [timePosted sizeWithFont:weakSelf.commentsPostedTime_.font constrainedToSize:CGSizeMake(weakSelf.commentsText_.frameWidth, 50)];
                [weakSelf.commentsPostedTime_ setText:timePosted];
                [weakSelf.commentsPostedTime_ setFrameWidth:commentsTimeSize.width];
                [weakSelf.commentsPostedTime_ setFrameHeight:commentsTimeSize.height];
                [weakSelf.commentsPostedTime_ setFrameY:weakSelf.commentsText_.frameY + weakSelf.commentsText_.frameHeight];
                [weakSelf.commentsPostedTime_ setFrameX:weakSelf.commentsText_.frameX];

                [UIView animateWithDuration:0.3 animations:^{
                    [weakSelf.commentsText_ setAlpha:1.0];
                    [weakSelf.commentsPostedTime_ setAlpha:1.0];
                } completion:^(BOOL finished){
                    [weakSelf parseTagsInComment];
                }];
            });

        });

Answer 1

如果你在最新的 master 上使用 Nimbus，那么你必须启用 ARC，否则你会得到内存泄漏。