UITableViewController中节标题的大小调整工作不正常

Question

我正在尝试根据标题UISegmentedControl中的选择调整节标题的大小。出于某种原因，它就是不想工作。我在更改高度代码之前、前后和之后都尝试过[self.tableView beginUpdates];和[self.tableView endUpdates];。。但它只是表现得很奇怪。

我让它隐藏和显示内容，但它似乎为视图分配了不同的高度，即使认为标题的大小应该更小。

发生的情况如下：https://dl.dropboxusercontent.com/u/3077127/Problem3.mov

这是我的代码：

typedef enum {
kSearchTypeFrom = 0,
kSearchTypeTo
} kSearchType;
@interface MainVC ()
@property (nonatomic, strong) FilterVC *filterView;
@property (nonatomic, assign) kSearchType searchType;
@end
@implementation MainVC
@synthesize filterView = _filterView;
@synthesize searchType = _searchType;
[...]
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
self.searchType = kSearchTypeFrom;
[self.tableView beginUpdates];
[self.tableView endUpdates];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
}
// Configure the cell...
[cell.detailTextLabel setText:@"Test"];
return cell;
}
- (UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
if (!self.filterView) {
self.filterView = [[FilterVC alloc] init];
[self.filterView.view setBackgroundColor:self.navigationController.navigationBar.barTintColor];
}
[self.filterView.segment setSelectedSegmentIndex:self.searchType];
[self.filterView.segment addTarget:self action:@selector(didChangeSegmentSelection:) forControlEvents:UIControlEventValueChanged];
return self.filterView.view;
}
- (float)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
if (self.searchType == kSearchTypeFrom)
{
return 130;
}
else {
return 100;
}
}
#pragma mark - Height change table section
- (void)didChangeSegmentSelection:(UISegmentedControl*)segment
{
[self.tableView beginUpdates];
self.searchType = segment.selectedSegmentIndex;
NSLog(@"Selected: %d", segment.selectedSegmentIndex);
if (segment.selectedSegmentIndex == 0)
{
[self.filterView.changeToText setHidden:NO];
[self.filterView.changeToButton setHidden:NO];
[self.filterView.fromButton setUserInteractionEnabled:NO];
}
else {
[self.filterView.changeToText setHidden:YES];
[self.filterView.changeToButton setHidden:YES];
[self.filterView.fromButton setUserInteractionEnabled:YES];
}
[self.tableView endUpdates];
[self.filterView.view needsUpdateConstraints];
}
[...]

FilterVC类不过是包含以下内容的UIViewController：

#import "InsetTextField.h"
@interface FilterVC : UIViewController
@property (nonatomic, strong) IBOutlet InsetTextField *amountField;
@property (nonatomic, strong) IBOutlet UISegmentedControl *segment;
@property (nonatomic, strong) IBOutlet UIButton *fromButton;
@property (nonatomic, strong) IBOutlet UILabel *changeToText;
@property (nonatomic, strong) IBOutlet UIButton *changeToButton;
@end

我做错了什么？

Answer 1

作为尝试动画的替代方法，您可以尝试使用以下方法重新加载表：

- (void)didChangeSegmentSelection:(UISegmentedControl*)segment
{
//[self.tableView beginUpdates];
self.searchType = segment.selectedSegmentIndex;
NSLog(@"Selected: %d", segment.selectedSegmentIndex);
if (segment.selectedSegmentIndex == 0)
{
[self.filterView.changeToText setHidden:NO];
[self.filterView.changeToButton setHidden:NO];
[self.filterView.fromButton setUserInteractionEnabled:NO];
}
else {
[self.filterView.changeToText setHidden:YES];
[self.filterView.changeToButton setHidden:YES];
[self.filterView.fromButton setUserInteractionEnabled:YES];
}
//[self.tableView endUpdates];
[self.tableView reloadData];
[self.filterView.view needsUpdateConstraints];
}

编辑：

用一个变量来跟踪高度怎么样？这是一个草率的代码，但如果这个概念有效，你可以重构它：

// Declare a variable
@proprty (strong, nonatomic) float headerHeight;
// Use that variable for defining the height
- (float)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
if (self.searchType == kSearchTypeFrom)
{
headerHeight = 130;
}
else {
headerHeight = 100;
}
return headerHeight
}

然后更改变量：

- (void)didChangeSegmentSelection:(UISegmentedControl*)segment
{
[self.tableView beginUpdates];
self.searchType = segment.selectedSegmentIndex;
// Change the variable used for the header height
if (self.searchType == kSearchTypeFrom)
{
headerHeight = 130;
}
else {
headerHeight = 100;
}
NSLog(@"Selected: %d", segment.selectedSegmentIndex);
if (segment.selectedSegmentIndex == 0)
{
[self.filterView.changeToText setHidden:NO];
[self.filterView.changeToButton setHidden:NO];
[self.filterView.fromButton setUserInteractionEnabled:NO];
}
else {
[self.filterView.changeToText setHidden:YES];
[self.filterView.changeToButton setHidden:YES];
[self.filterView.fromButton setUserInteractionEnabled:YES];
}
[self.tableView endUpdates];
[self.filterView.view needsUpdateConstraints];
}