在UITableViewController的didSelectRowAtIndexPath
下,我將一個NSObject文件中的屬性設置爲一個值。我可以使用NSLog並查看變量確實已設置。但是,當我使用表視圖並單擊激活didSelectRowAtIndexPath
的單元格時,我注意到當視圖更改爲另一個UITableViewController時,該變量將其自身設置爲零。我甚至在viewDidLoad
下做了一個NSLog來檢查這個屬性值,它返回nil。爲什麼是這樣?我怎樣才能做到這一點,所以它不會改變爲零?爲什麼我的變量設置爲零?
首先UITableView.m:
#import "enchantmentViewController.h"
#import "levelViewController.h"
#import "dataBrain.h"
@interface enchantmentViewController()
@property (nonatomic, strong) dataBrain *brain;
@property (nonatomic, strong) levelViewController *level;
@end
@implementation enchantmentViewController
@synthesize brain = _brain;
@synthesize level = _level;
- (dataBrain *)brain
{
if (!_brain){
_brain = [[dataBrain alloc] init];
}
return _brain;
}
- (levelViewController *)level
{
if (!_level){
_level = [[levelViewController alloc] init];
}
return _level;
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
//warning Potentially incomplete method implementation.
// Return the number of sections.
return [self.brain enchantmentNumberOfSections];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//#warning Incomplete method implementation.
// Return the number of rows in the section.
return [self.brain enchantmentNumberOfCells:section];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"enchantment";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
cell.textLabel.text = [self.brain enchantmentCellText:indexPath];
return cell;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [self.brain enchantmentSectionData:section];
}
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
[self.brain convertSelectedTableCellToNumberOfPossibleEnchantments:indexPath];
[self.brain test];
}
@end
二的UITableViewController代碼:
#import "levelViewController.h"
#import "dataBrain.h"
@interface levelViewController()
@property (nonatomic, strong) dataBrain *brain;
@end
@implementation levelViewController
@synthesize brain = _brain;
- (dataBrain *)brain
{
if (!_brain){
_brain = [[dataBrain alloc] init];
}
return _brain;
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (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.
//NSLog(@"needing sections");
NSLog(@"value: %@", [self.brain levelNumberOfCells]);
return [self.brain.numberOfLevelsForCurrentEnchantment integerValue];
//[self.brain levelNumberOfCells];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"level";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
cell.textLabel.text = @"jo";//[self.brain levelCellText:indexPath];
return cell;
}
@end
[self.brain test]
返回是有問題的變量的值。
這可能是一個愚蠢的問題:什麼是「NSObject文件」? – 2012-01-06 01:54:56
一個NSObject的子類的新文件,抱歉沒有明確說明。 – blake305 2012-01-06 01:56:10
發佈一些代碼,它會幫助我們。 – esqew 2012-01-06 01:56:42