我对iOS还是很陌生，还有很多东西要学习，希望你们能从我的错误中引导我。
我最近学习了将数据从TableView传递到DetailView的想法，然后思考为什么不这样做。我还开始构建StopWatch应用程序，并认为日志功能将非常有用。
话虽如此，我目前正在构建一个秒表应用程序，它可以用作计时器并具有高分日志功能。它从View（秒表）到tableView（日志板），我正在使用NSMutableArray作为临时存储来保存信息，因为这些信息在应用程序启动/关闭时会丢失。不幸的是，似乎通过在各处更改和跟踪变量，我感到困惑并陷入困境。
感谢您的建议和帮助，也感谢@Abizern给我的提示。设法解决所有问题。请将代码留在这里，以防将来有人做与此类似的事情。
TimerViewController.h
#import <UIKit/UIKit.h>
#import "SampleData.h"
#import "SampleDataDAO.h"
#import "HighScoreTableViewController.h"
@interface TimerViewController : UIViewController
{
NSTimer *stopWatchTimer; // Store the timer that fires after a certain time
NSDate *startDate; // Stores the date of the click on the start button
}
@property(nonatomic, strong) SampleDataDAO *daoDS;
@property(nonatomic, strong) NSMutableArray *ds;
@property (retain, nonatomic) IBOutlet UILabel *stopWatchLabel;
@property (weak, nonatomic) IBOutlet UIButton *onStartPressed;
@property (weak, nonatomic) IBOutlet UIButton *onStopPressed;
@property (weak, nonatomic) IBOutlet UIButton *onLogPressed;
@property (weak, nonatomic) IBOutlet UIButton *onHighscorePressed;
- (IBAction)onStartPressed:(id)sender;
- (IBAction)onStopPressed:(id)sender;
- (IBAction)onLogPressed:(id)sender;
- (IBAction)onHighscorePressed:(id)sender;
@end
TimerViewController.m
#import "TimerViewController.h"
@interface TimerViewController ()
@end
@implementation TimerViewController
@synthesize stopWatchLabel;
@synthesize onStartPressed;
@synthesize onStopPressed;
@synthesize onLogPressed;
@synthesize onHighscorePressed;
@synthesize ds,daoDS;
- (void)viewDidLoad
{
[super viewDidLoad];
daoDS = [[SampleDataDAO alloc] init];
self.ds = daoDS.PopulateDataSource;
onStopPressed.enabled=false;
}
- (void)viewDidUnload
{
[self setStopWatchLabel:nil];
[self setOnStartPressed:nil];
[self setOnLogPressed:nil];
[self setOnStopPressed:nil];
[self setOnHighscorePressed:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([[segue identifier] isEqualToString:@"showDetail"]) {
HighScoreTableViewController *detailViewController = [segue destinationViewController];
detailViewController.arrayOfSampleData = self.ds;
}
}
- (void)updateTimer
{
NSDate *currentDate = [NSDate date];
NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:startDate];
NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"HH:mm:ss.S"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
NSString *timeString=[dateFormatter stringFromDate:timerDate];
stopWatchLabel.text = timeString;
}
- (IBAction)onStartPressed:(id)sender {
startDate = [NSDate date];
// Create the stop watch timer that fires every 10 ms
stopWatchTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/10.0
target:self
selector:@selector(updateTimer)
userInfo:nil
repeats:YES];
onStartPressed.enabled=false;
onStopPressed.enabled=true;
}
- (IBAction)onStopPressed:(id)sender {
[stopWatchTimer invalidate];
stopWatchTimer = nil;
[self updateTimer];
onStartPressed.enabled=true;
}
- (IBAction)onLogPressed:(id)sender {
NSString * timeCaptured = stopWatchLabel.text;
static NSInteger i = 1 ;
SampleData* mydata = [[SampleData alloc]init];
mydata.clueName=[NSString stringWithFormat:@"clue %d",i++ ];
mydata.timeLog = timeCaptured;
[self.ds addObject:mydata];
NSLog(@"%@",mydata.clueName);
NSLog(@"time %@", mydata.timeLog);
NSLog(@"%d",[self.ds count]);
mydata=nil;
}
- (IBAction)onHighscorePressed:(id)sender {
NSLog(@"Proceeding to HighScore");
}
@end
HighScoreTableView.h
#import <UIKit/UIKit.h>
#import "SampleData.h"
#import "SampleDataDAO.h"
#import "TimerViewController.h"
@interface HighScoreTableViewController : UITableViewController
@property (nonatomic, strong) NSMutableArray *arrayOfSampleData;
@property (nonatomic, strong) SampleData * highscoreData;
@end
HighScoreTableView.m
#import "HighScoreTableViewController.h"
@interface HighScoreTableViewController ()
@end
@implementation HighScoreTableViewController
@synthesize highscoreData;
@synthesize arrayOfSampleData;
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
highscoreData = [[SampleData alloc]init];
[super viewDidLoad];
}
- (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 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.arrayOfSampleData.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"highscoreCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// Configure the cell...
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
//highscoreData = [self.arrayOfSampleData objectAtIndex:indexPath.row];
highscoreData = (SampleData *)[self.arrayOfSampleData objectAtIndex:indexPath.row]; //if above line doesn't work, use this
cell.textLabel.text=[NSString stringWithFormat:@"%@ time %@",highscoreData.clueName, highscoreData.timeLog];
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
*/
}
@end
SampleData.h
#import <Foundation/Foundation.h>
@interface SampleData : NSObject
@property(nonatomic,strong) NSString * clueName;
@property(nonatomic,strong) NSString * timeLog;
@end
SampleData.m
#import "SampleData.h"
@implementation SampleData
@synthesize clueName,timeLog;
@end
SampleDataDAO.h
#import <Foundation/Foundation.h>
#import "SampleData.h"
@interface SampleDataDAO : NSObject
@property(nonatomic, strong) NSMutableArray * someDataArray;
-(NSMutableArray *)PopulateDataSource;
@end
SampleDataDAO.m（不确定是否需要此DAO NSObject）
#import "SampleDataDAO.h"
@implementation SampleDataDAO
@synthesize someDataArray;
-(NSMutableArray *)PopulateDataSource
{
someDataArray = [[NSMutableArray alloc] init];
SampleData * mydata = [[SampleData alloc] init];
mydata = nil;
return someDataArray;
}
@end
最佳答案
您的编码中有几个错误步骤：
您确实需要使用prepareForSegue将数据从父视图控制器传递给子视图控制器。您的情况是从TimerViewController到HighScoreTableViewController。
在您的HighScoreTableViewController类中，创建一个iVar数组，该数组将保存您将通过sampleData从TimerViewController即时传递过来的prepareForSeque数组。像这样：
HighScoreTableViewController.h
@property (nonatomic, strong) NSArray *arrayOfSampleData;
3。在
prepareForSeque的TimerViewController中，此行是错误的：//TimerViewController.highscoreData = [self.ds objectAtIndex：[self.tableView indexPathForSelectedRow] .row];
尝试这个：
detailViewController.arrayOfSampleData = self.ds;
4。在HighScoreTableViewController.m中的viewDidLoad下，替换为
highscoreData = (SampleData *)self.highscoreData;
与：
highscoreData = [SampleData alloc]init];
5。在numberOfRowsInSection中，您现在可以执行以下操作：
return self.arrayOfSampleData.count;
6。在cellForRowAtIndexPath中，
highscoreData = [self.arrayOfSampleData objectAtIndex:indexPath.row];
//highscoreData = (SampleData *)[self.arrayOfSampleData objectAtIndex:indexPath.row]; //if above line doesn't work, use this
cell.textLabel.text = @"%@ time %@ ", highscoreData.clueName, highscoreData.timeLog;
关于objective-c - iOS使用数据加载表格 View ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/11342284/