主要点
- 设置headView宽度约束等于tableView的宽度，并将headView赋值给tableView.tableHeaderView
- 布局子视图，且让headView能够根据子视图的约束，自动计算出自身的高度
- 刷新视图布局，并重新将headView赋值给tableView.tableHeaderView
上代码：
- (void)setupTableHeadView {
UIView *headView = [[UIView alloc] init];
self.tableView.tableHeaderView = headView;
// 此处必须指定宽度
[headView mas_makeConstraints:^(MASConstraintMaker *make) {
make.width.mas_equalTo(YD_SCREEN_SIZE.width);
make.top.mas_equalTo(self.tableView.mas_top);
}];
UIView *bgView = [[UIView alloc] init];
bgView.backgroundColor = [UIColor yd_color_212639];
bgView.layer.masksToBounds = YES;
bgView.layer.cornerRadius = 4;
[headView addSubview:bgView];
[bgView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(headView.mas_top).offset(30);
make.left.equalTo(headView.mas_left).offset(10);
make.right.equalTo(headView.mas_right).offset(-10);
make.bottom.equalTo(headView.mas_bottom);
}];
UILabel *label = [[UILabel alloc] init];
label.text = @"开启报警提醒";
label.textColor = [UIColor whiteColor];
label.font = [UIFont systemFontOfSize:16];
[bgView addSubview:label];
[label mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(bgView.mas_top);
make.left.equalTo(bgView.mas_left).offset(15);
make.height.mas_equalTo(100);
}];
[label setContentHuggingPriority:UILayoutPriorityDefaultLow - 1 forAxis:UILayoutConstraintAxisHorizontal];
// [label setContentCompressionResistancePriority:UILayoutPriorityDefaultLow - 1 forAxis:UILayoutConstraintAxisHorizontal];
// 开关
_switchButton = [[UIButton alloc] init];
[_switchButton setImage:[UIImage imageNamed:@"off"] forState:UIControlStateNormal];
[bgView addSubview:_switchButton];
[_switchButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(label.mas_right);
make.right.equalTo(bgView.mas_right).offset(-10);
make.centerY.equalTo(label.mas_centerY);
}];
// 分割线
UIView *splitView = [[UIView alloc] init];
splitView.backgroundColor = [UIColor yd_color_main];
[bgView addSubview:splitView];
[splitView mas_makeConstraints:^(MASConstraintMaker *make) {
make.height.mas_equalTo(1);
make.top.equalTo(label.mas_bottom);
make.left.equalTo(bgView.mas_left).offset(10);
make.right.equalTo(bgView.mas_right).offset(-10);
}];
// 说明
UILabel *descriptionLabel = [[UILabel alloc] init];
descriptionLabel.text = @"开启后将在设置的时间段内接收到三级报警声";
descriptionLabel.font = [UIFont systemFontOfSize:10];
descriptionLabel.textColor = [UIColor yd_color_656977];
[bgView addSubview:descriptionLabel];
[descriptionLabel mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(splitView.mas_bottom);
make.left.equalTo(bgView.mas_left).offset(10);
make.bottom.equalTo(bgView.mas_bottom);
make.right.equalTo(bgView.mas_right).offset(-10);
make.height.mas_equalTo(40);
}];
// iOS 10(含)之后需调用该方法，否则tableHeaderView会盖着cell
[self.tableView.tableHeaderView layoutIfNeeded]; // 或者[self.tableView layoutIfNeeded];
// 若系统版本为iOS9,还必须在取得正确的frame之后，重新设置tableHeaderView
// iOS10(含),可省略该操作
self.tableView.tableHeaderView = headView;
}
效果图如下：
效果图
