iOS tableHeaderView使用frame和Masonry对比

tableHeaderView 对大家都不陌生，一直用到。但使用frame设置和Masonry其实是有差别的。先简述下我遇到的问题

自动布局设置tableHeaderView，滚动会有问题,但tableHeaderView内部使用Masonry是可以的

一、懒加载方式创建tableHeaderView（适合比较复杂的布局，或高度动态变化，时有时无，代码封装，可读性比较好）

1、懒加载创建

- (ICKTrendTopMsgView *)topView {
    if (!_topView) {
        _topView = [[ICKTrendTopMsgView alloc] init];
        WeakObj(self);
        _topView.btnClick = ^{

            Weakself.iCKTiltleModel.msgBottomCount = nil;
            ICKDymMsgListViewController *vc = [ICKDymMsgListViewController new];
            vc.unreadMsgIdSet = Weakself.iCKTiltleModel.unReadMessageIdList;
            [Weakself pushViewController:vc];
            if (Weakself.msgBtnClick) Weakself.msgBtnClick();
        };
    }
    return _topView;
}

2、设置tableHeaderView

//  topview 不随tableview滚动
//    [self.view addSubview:self.topView];
//    [self.topView mas_remakeConstraints:^(MASConstraintMaker *make) {
//        make.left.equalTo(self.view.mas_left);
//        make.top.equalTo(self.view.mas_top);
//        make.height.mas_equalTo(0);
//        make.width.mas_equalTo(LL_ScreenWidth);
//    }];
//
//    [mainTableView mas_remakeConstraints:^(MASConstraintMaker *make) {
//        make.left.equalTo(self.view.mas_left);
//        make.top.equalTo(self.topView.mas_bottom);
//        make.bottom.equalTo(self.view.mas_bottom);
//        make.width.mas_equalTo(LL_ScreenWidth);
//    }];
    
// tableHeaderView 0.01的时候才有效果  topview 随tableview滚动
    // frame
    self.topView.frame = CGRectMake(0, 0, LL_ScreenWidth, 0.01);
    mainTableView.tableHeaderView = self.topView;
    
//    自动布局设置tableHeaderView 会有问题
//    mainTableView.tableHeaderView = self.topView;
//    [self.topView mas_remakeConstraints:^(MASConstraintMaker *make) {
//        make.height.mas_equalTo(0.01);
//        make.width.mas_equalTo(LL_ScreenWidth);
//    }];
    
    [mainTableView mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.view.mas_left);
        make.top.equalTo(self.view.mas_top);
        make.bottom.equalTo(self.view.mas_bottom);
        make.width.mas_equalTo(LL_ScreenWidth);
    }];

3、动态变换tableHeaderView高度

- (void)setICKTiltleModel:(ICKTiltleModel *)iCKTiltleModel
{
    _iCKTiltleModel = iCKTiltleModel;
    
    if (iCKTiltleModel.msgBottomCount.integerValue)
    {
        NSString *str = [NSString stringWithFormat:@"%@条新消息",ObjErrorCheck(iCKTiltleModel.msgBottomCount)];
        [self.topView.btn setTitle:str forState:UIControlStateNormal];
        self.topView.btn.hidden = NO;
        self.topView.height = 54;
        [self.topView.btn layoutButtonWithEdgeInsetsStyle:MKButtonEdgeInsetsStyleRight imageTitleSpace:10];
       

    }
    else
    {

        self.topView.btn.hidden = YES;
//        topview 不随tableview滚动
//        [self.topView mas_updateConstraints:^(MASConstraintMaker *make) {
//            make.height.mas_equalTo(0);
//        }];
        self.topView.height = 0.01;
    }
    // 更新frame之后要重新设置tableHeaderView
    // frame
    mainTableView.tableHeaderView = self.topView;
    
    
}

小记：

1、topview 不随tableview滚动 使用 [self.view addSubview:self.topView];可以正常设置高度，高度变化后直接更新topview高度即可

2、topview 随tableview滚动 使用 mainTableView.tableHeaderView = self.topView; 且用frame方式并且高度要0.01才有效果，高度变化后更新topview高度同时再次设置tableHeaderView

二、直接创建tableHeaderView（适合比较简单的表头，高度固定）

UIView *bgView = [[UIView alloc]initWithFrame:CGRectMake(0,0,0,135)];
    bgView.backgroundColor = [UIColor clearColor];
    mainTableView.tableHeaderView = bgView;
    
    UIView *contentView = [[UIView alloc]init];
    contentView.backgroundColor = XZWL_COLOR_FFFFFF;
    [bgView addSubview:contentView];
    [contentView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(bgView).offset(10);
        make.left.equalTo(bgView).offset(10);;
        make.right.equalTo(bgView).offset(-10);;
        make.bottom.equalTo(bgView);
    }];
    [self.view setNeedsLayout];
    [self.view layoutIfNeeded];
    [contentView setCornerOnTop:8];
    
    UIImageView *thingsImage = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"carrer_circle_value_header"]];
    thingsImage.contentMode = UIViewContentModeScaleAspectFit;
    [contentView addSubview:thingsImage];
    [thingsImage mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(contentView);
        make.bottom.equalTo(contentView);
    }];