iOS 懒加载在中的奇葩内存泄漏

原来代码

// 有内存泄漏
- (QYSegmentedView *)segmentBar {
    if (!_segmentBar) {
        QYSegmentedView *segmentBar = [QYSegmentedView segmentedViewWithFrame:CGRectZero];
        segmentBar.backgroundColor = [UIColor brownColor];
        [self.view addSubview:segmentBar];
        
        segmentBar.didSlectedIndexBlock = ^(NSInteger targetIndex, NSInteger sourceIndex) {
            [self showChildVCViewsAtIndex:targetIndex];
        };
        
        _segmentBar = segmentBar;
    }
    return _segmentBar;
}

// 无内存泄漏
- (QYSegmentedView *)segmentBar {
    if (!_segmentBar) {
        QYSegmentedView *segmentBar = [QYSegmentedView segmentedViewWithFrame:CGRectZero];
        segmentBar.backgroundColor = [UIColor brownColor];
        [self.view addSubview:segmentBar];
        
        __weak __typeof(self)weakSelf = self;;
        segmentBar.didSlectedIndexBlock = ^(NSInteger targetIndex, NSInteger sourceIndex) {
            [weakSelf showChildVCViewsAtIndex:targetIndex];
        };
        
        _segmentBar = segmentBar;
    }
    return _segmentBar;
}