我有一个UITableViewController，它作为UIPopOverController的视图控制器呈现。 tvc有三个属性 - 一个字典和两个数组。该字典包含两个数组，用于填充其他两个属性。我遵循这个过程：
在根视图控制器中，我初始化表视图控制器 在触发器上，我设置表视图控制器的字典属性并调用方法（reloadData）。
- (void) reloadData {
self.arrGroupSearches = [self.dictSavedSearches objectForKey:@"Group Searches"];
self.arrCustomerSearches = [self.dictSavedSearches objectForKey:@"Customer Searches"];
[self.tableView reloadData];
}
当我逐步完成该方法时，数据就像我预期的那样被引入。
self SavedSearchesPopoverViewController * 0x786653c0 0x786653c0
UITableViewController UITableViewController
_dictSavedSearches NSDictionary * 2 key/value pairs 0x79fb6ab0
_arrGroupSearches NSArray * @"1 object" 0x79fb6b00
_arrCustomerSearches NSArray * @"0 objects" 0x79faf410
但是一旦代码命中[self.tableView reloadData]调用，它就会重置viewcontroller属性
self SavedSearchesPopoverViewController * 0x786653c0 0x786653c0
UITableViewController UITableViewController
_dictSavedSearches NSDictionary * 0 key/value pairs 0x79938560
_arrGroupSearches NSArray * @"0 objects" 0x78744160
_arrCustomerSearches NSArray * @"0 objects" 0x78744160
我不确定我在这里做错了什么。
编辑：这是整个实施：
@implementation SavedSearchesPopoverViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.arrCustomerSearches = [[NSArray alloc] init];
self.arrGroupSearches = [[NSArray alloc] init];
self.dictSavedSearches = [[NSDictionary alloc] init];
self.tableView.rowHeight = 30.0;
}
- (void) reloadData {
self.arrGroupSearches = [self.dictSavedSearches objectForKey:@"Group Searches"];
self.arrCustomerSearches = [self.dictSavedSearches objectForKey:@"Customer Searches"];
[self.tableView reloadData];
}
#pragma mark - Table view data source
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
UIView* vHeader = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, tableView.frame.size.width, 40.0)];
if (section == 0) {
UILabel* lblPopoverTitle = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 5.0, 240.0, 30.0)];
lblPopoverTitle.text = @"Group Saved Searches";
lblPopoverTitle.textColor = GMT_BRIGHT_BLUE;
lblPopoverTitle.font = FORM_NAME;
lblPopoverTitle.textAlignment = NSTextAlignmentCenter;
[vHeader addSubview:lblPopoverTitle];
} else if (section == 1) {
UILabel* lblPopoverTitle = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 5.0, 240.0, 30.0)];
lblPopoverTitle.text = @"Customer Saved Searches";
lblPopoverTitle.textColor = GMT_BRIGHT_BLUE;
lblPopoverTitle.font = FORM_NAME;
lblPopoverTitle.textAlignment = NSTextAlignmentCenter;
[vHeader addSubview:lblPopoverTitle];
}
vHeader.backgroundColor = GMT_DARK_BLUE;
return vHeader;
}
- (CGFloat) tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
return 40.0;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
if (section == 0) {
return self.arrGroupSearches.count;
} else if (section == 1) {
return self.arrCustomerSearches.count;
}
return 0;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = (UITableViewCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell...
NSString* strValue;
if (indexPath.section == 0) {
strValue = [self.arrGroupSearches objectAtIndex:indexPath.row];
} else if (indexPath.section == 1) {
strValue = [self.arrCustomerSearches objectAtIndex:indexPath.row];
}
cell.textLabel.text = strValue;
cell.textLabel.textColor = GMT_DARK_BLUE;
cell.textLabel.font = TABLE_CELL_FONT;
return cell;
}
- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSDictionary* dictUserData = [[NSDictionary alloc] initWithObjectsAndKeys:
nil];
[[NSNotificationCenter defaultCenter] postNotificationName:@"cvc" object:self userInfo:dictUserData];
}
视图控制器是init中的另一个视图控制器（contentViewController）在视图中加载：
self.mySavedSearchesPopover = [[SavedSearchesPopoverViewController alloc] init];
并在popover中呈现如下：
if (showSavedSearches) {
//check to see if there are saved searches first before presenting popover
NSDictionary* dictSavedSearches = [self.myController readPlistFile:@"savedSearches"];
if (![dictSavedSearches objectForKey:@"Error Message"]) {
self.mySavedSearchesPopover.dictSavedSearches = [self.myController getSavedSearches:dictSavedSearches];
[self.mySavedSearchesPopover reloadData];
[self.mySavedSearchesPopover.tableView reloadData];
[self presentPopover:SAVED_SEACHES_POPOVER];
} else {
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"savedSearchErrorTitle", nil) message:NSLocalizedString(@"savedSearchErrorMsg", nil) delegate:nil cancelButtonTitle:NSLocalizedString(@"ok", nil) otherButtonTitles:nil, nil];
[alert show];
}
}
- (void) presentPopover : (int) popoverID {
if (self.currentPopoverController != nil) {
[self.currentPopoverController dismissPopoverAnimated:YES];
self.currentPopoverController = nil;
}
CGRect launchFrame;
...
} else if (popoverID == SAVED_SEACHES_POPOVER) {
//this is inited in the update view method
launchFrame = CGRectMake(0.0, 70.0, 0.0, 180.0);
self.currentPopoverController = [[UIPopoverController alloc] initWithContentViewController:self.mySavedSearchesPopover];
self.currentPopoverController.popoverContentSize = CGSizeMake(240.0, 300.0);
...
//display popovercontroller
[self.currentPopoverController presentPopoverFromRect:launchFrame inView:self.view
permittedArrowDirections:UIPopoverArrowDirectionLeft
animated:YES];
答案 0 :(得分：1)
在以下代码块中显示popover：
[self.mySavedSearchesPopover reloadData];
[self.mySavedSearchesPopover.tableView reloadData];
[self presentPopover:SAVED_SEACHES_POPOVER];
在调用viewDidLoad之后，[self.mySavedSearchesPopover reloadData]方法正在触发，而reloadData正在使用空数组重新创建这些属性。出现弹出框后，您需要调用{{1}}。