在iOS10上计算高度调用 fd_heightForCellWithIdentifier:(NSString *)identifier configuration:(void (^)(id cell))configuration 方法时，获取到的contentViewWidth是1000，导致不能正确计算高度了

用Masonry写的约束，想动态改变cell内imageView的高度，实现cell的自适应高度。代码如下

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        self.imageV = [[UIImageView alloc] init];
        [self.contentView addSubview:self.imageV];
        self.imageV.backgroundColor = [UIColor redColor];
        [self.imageV mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.top.right.equalTo(self.contentView);
            make.height.equalTo(@(60));
            make.bottom.equalTo(self.contentView).offset(-20);
        }];
    }
    return self;
}

- (void)updateConstraints
{
        [self.imageV mas_updateConstraints:^(MASConstraintMaker *make) {
            if (self.indexPath.row % 2 == 0) {
                make.height.equalTo(@(60));
            } else {
                make.height.equalTo(@(10));
            }
        }];

    [super updateConstraints];
}

把updateConstraints注释掉，一切都正常，打开updateConstraints动态改变imageView高度时界面效果是达到预期了也能正常运行，但是出现约束冲突提示：

(
    "<MASLayoutConstraint:0x7f8ab2d6c3a0 UIImageView:0x7f8ab2d6b1c0.top == UITableViewCellContentView:0x7f8ab2d6aaa0.top>",
    "<MASLayoutConstraint:0x7f8ab2d6c730 UIImageView:0x7f8ab2d6b1c0.height == 60>",
    "<MASLayoutConstraint:0x7f8ab2d6c8b0 UIImageView:0x7f8ab2d6b1c0.bottom == UITableViewCellContentView:0x7f8ab2d6aaa0.bottom - 20>",
    "<NSLayoutConstraint:0x7f8ab2d6cf70 UITableViewCellContentView:0x7f8ab2d6aaa0.height == 30>"
)

Will attempt to recover by breaking constraint 
<MASLayoutConstraint:0x7f8ab2d6c730 UIImageView:0x7f8ab2d6b1c0.height == 60>

这个跟高度缓存有关吗？ 还是我写的约束有问题？求指导

*** Assertion failure in -[UITableView fd_templateCellForReuseIdentifier:], /Users/cyq/Documents/git/CarPrice/CarPrice/Pods/UITableView+FDTemplateLayoutCell/Classes/UITableView+FDTemplateLayoutCell.m:41

• Hook 1 (expr -- @import UIKit)
• Hook 2 (target stop-hook disable) 2016-01-28 14:42:11.093 CarPrice[6288:2450021] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Cell must be registered to table view for identifier - TableSampleIdentifier'

加了[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"TableSampleIdentifier"];

• (CGFloat)fd_systemFittingHeightForConfiguratedCell:(UITableViewCell *)cell 方法里的 fittingHeight = [cell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;这行在调用系统方法时候会被UIkit断言阻隔。导致崩溃

demo 有会出现这种情况

cell. UITableViewCellContentView.width = 0 与 cell. UITableViewCellContentView.width = 375 (对应的最大宽度) MAXWidth 冲突

** FDTemplateLayoutCell ** layout cell created - FDFeedCell 2017-04-05 15:14:53.986190+0800 Demo[4230:1055755] [LayoutConstraints] Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. ( "<NSLayoutConstraint:0x174085eb0 UITableViewCellContentView:0x100422b60.width == 341 (active)>", "<NSLayoutConstraint:0x17008f5a0 'UIView-Encapsulated-Layout-Width' UITableViewCellContentView:0x100422b60.width == 0 (active)>" )

发现了一个非常极端的BUG 当使用了FD，并且设置了 tableView.estimatedRowHeight ，会导致sd_web有些图片加载不出来，需要滑动列表才会显示出来。 比如我的情况，tableView的head 高度150， cell 高度 280，第二个cell正好处于显示半个的情况，那么第二个cell的图片100%不加载。其他cell的图片也存在不规则的不加载。 如果不设置tableView.estimatedRowHeight 则不会触发这个BUG，不使用FD也不会触发，不知道FD和SD的算法产生了什么冲突。

最近在做项目的时候，一个UITableViewCell的.xib 的autolayout布局，就一个label。上下左右到contentView的上下左右。然后这个库还是在计算高度的时候出现约束冲突，虽然程序没有崩了，看着输出的约束，心里老难受了。然后就各种想办法解决。后来发现自己的app已经是最低版本是8.0（这个和老大商量过得，现在8.0下面的应用应该很少了，我买的那个4s都换了，估计用的人也很少很少了 吧）。我用的self.tableView.estimatedRowHeight = 44; self.tableView.rowHeight = UITableViewAutomaticDimension;发现程序的高度布局一点问题都没有。

或许这就是作者不在更新这个库的原因吧。不知道我的想法对不对，我的列表数据很少很简单，复杂的布局不知道是什么效果，慢慢再测试吧！希望懂的人指导指导一下。

我这样添加了一个View和约束,并且先设定了蓝色的视图的，高度 而后在代码里修改了蓝色视图的高度

• (void)configureCell:(UITableViewCell )cell atIndexPath:(NSIndexPath *)indexPath { MMDiaryCell *virtualCell=(MMDiaryCell)cell; // CGFloat raH= arc4random() % 200+20; [virtualCell setMyheight:250]; }

cell.m里面 -(void)setMyheight:(CGFloat )height { _blueHeigthLayout.constant=height; }

然后提示了一个约束警告

2015-12-02 22:29:00.589 MeiMei[1105:33286] Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) ( "<NSLayoutConstraint:0x7f9a3250b940 UIView:0x7f9a325764a0.height == 54>", "<NSLayoutConstraint:0x7f9a32566d60 UIView:0x7f9a325764a0.top == UITableViewCellContentView:0x7f9a32582d90.top + 8>", "<NSLayoutConstraint:0x7f9a3256eeb0 UITableViewCellContentView:0x7f9a32582d90.bottom == UIView:0x7f9a325764a0.bottom + 8>", "<NSLayoutConstraint:0x7f9a32574900 UITableViewCellContentView:0x7f9a32582d90.height == 266>" )

Will attempt to recover by breaking constraint <NSLayoutConstraint:0x7f9a3250b940 UIView:0x7f9a325764a0.height == 54>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

是我这样用法存在问题么？

I am using xibs in my project. I followed your guidelines. But, still I am not able to make it work with xib.

Please provide the details, for how to add it with xib.

I have one image view inside cell content that loads photo from server. image view content mode is aspect fill and only width has been defined using autolayout in storyboard. height should be increased dynamically based on loaded photo size. constraints for cell content view has been already self-satisfied. what am I missing?

• (void)fd_insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation { if (self.fd_autoCacheInvalidationEnabled) { [indexPaths enumerateObjectsUsingBlock:^(NSIndexPath *indexPath, NSUInteger idx, BOOL *stop) { NSMutableArray *rows = self.fd_cellHeightCache.sections[indexPath.section]; [rows insertObject:@(_FDTemplateLayoutCellHeightCacheAbsentValue) atIndex:indexPath.row]; }]; } [self fd_insertRowsAtIndexPaths:indexPaths withRowAnimation:animation]; // Primary call [self fd_precacheIfNeeded]; }

From your readme:

A template layout cell is created by -dequeueReusableCellWithIdentifier: method, it means that you MUST have registered this cell reuse identifier by one of: A prototype cell of UITableView in storyboard. Use -registerNib:forCellReuseIdentifier: Use -registerClass:forCellReuseIdentifier:

Usually it is also possible to call dequeueReusableCellWithIdentifier and create a cell in the same place if necessary but you forbid that

因为IndexSet是按从小到大分布，FD枚举删除的时候没考虑到这个问题（其实和 Issue #54 是同一个bug） 解决方案是不应该用枚举的方式逐个删除，而应使用 removeObjectsAtIndexes直接一步删除

由于FD已经不再维护，所以我们要么整个项目clone下来改，要么只能使用Swizzle替换方法。

我选的后者，这里给出部分swift代码

@objc private func _deleteSections(_ sections: IndexSet, with animation: UITableView.RowAnimation) {
        guard fd_indexPathHeightCache.automaticallyInvalidateEnabled, !sections.isEmpty else {
            _deleteSections(sections, with: animation)
            return
        }
        
        // FD框架有严重bug，我们自己来
        let portrait = fd_indexPathHeightCache.value(forKey: "_heightsBySectionForPortrait") as? NSMutableArray
        let landscape = fd_indexPathHeightCache.value(forKey: "_heightsBySectionForLandscape") as? NSMutableArray
        
        portrait?.removeObjects(at: sections)
        landscape?.removeObjects(at: sections)
        
        // 我们已经处理好了，避免FD的bug代码二次处理
        fd_indexPathHeightCache.automaticallyInvalidateEnabled = false
        defer {
            fd_indexPathHeightCache.automaticallyInvalidateEnabled = true
        }
        _deleteSections(sections, with: animation)
    }

cache the height to model, may is anythings you want

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: cellIdForMessage(msg:array[safe: indexPath.row]), for: indexPath)
        
        if let model = array[safe: indexPath.row] {
            cell.reloadData(data: model as Any)
            if (model.cellHeigth > CGFloat(0)) == false {
                let size = cell.contentView.systemLayoutSizeFitting(CGSize(width: YYScreenSize().width, height: 0), withHorizontalFittingPriority: .required, verticalFittingPriority: .fittingSizeLevel)
                model.cellHeigth = size.height
            }
        }

        return cell;
    }

遇到问题： 1.接口请求数据回来，tableView去reload的数据会有明显卡顿。 2.股票行情类app，ws订阅会大量的数据在异步处理完后，会有大量的回调到主线程渲染UI，造成主线程拥塞，FD渲染高度计算不全，一般小于实际高度，经常导致部分cell高度小于实际高度。

需求： 1.能支持异步计算高度。 2.当接口数据请求回来，可以用FD异步处理好高度，再回调到主线程reload TableView。