我正在尝试制作秒表应用程序并面临使其正常工作的问题。当我启动秒表并停止并再次启动时,它不会从停止的地方继续。它继续运行,就好像它没有停止一样。需要一些指导以使其正常工作。我从早上开始就一直在尝试,我所做的其他功能类似于苹果的秒表,只是这让我很烦恼..感谢任何帮助...
代码如下所示:
视图控制器.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>{
UILabel *lbl;
NSTimer *stopTimer;
NSDate *startDate,*currentDate;
BOOL running;
UIButton *bttn;
NSMutableArray *tableItems;
NSString *timeString,*currentString;
UITableView *tableview;
int counter;
}
@property (strong,nonatomic) IBOutlet UILabel *lbl;
@property (strong,nonatomic) IBOutlet UIButton *bttn;
@property (strong,nonatomic) NSMutableArray *tableItems;
@property (strong,nonatomic) NSString *timeString;
@property (strong,nonatomic) IBOutlet UITableView *tableview;
-(IBAction)startPressed:(id)sender;
-(IBAction)resetPressed:(id)sender;
-(void)updateTimer;
@end
视图控制器.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize lbl,bttn,tableItems,timeString,tableview;
- (void)viewDidLoad
{
[super viewDidLoad];
lbl.text = @"00.00.00.0";
running = FALSE;
//difference = @"0";
startDate = [NSDate date];
tableItems = [[NSMutableArray alloc] init];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(IBAction)startPressed:(id)sender{
if(!running){
running = TRUE;
[sender setTitle:@"Stop" forState:UIControlStateNormal];
[bttn setTitle:@"Lap" forState:UIControlStateNormal];
if (stopTimer == nil) {
stopTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/10.0
target:self
selector:@selector(updateTimer)
userInfo:nil
repeats:YES];
}
}else{
running = FALSE;
//startDate = currentDate;
//difference = currentString;
[sender setTitle:@"Start" forState:UIControlStateNormal];
[bttn setTitle:@"Restart" forState:UIControlStateNormal];
[stopTimer invalidate];
stopTimer = nil;
}
}
-(void)updateTimer{
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]];
timeString=[dateFormatter stringFromDate:timerDate];
lbl.text = timeString;
}
-(IBAction)resetPressed:(id)sender{
if (!running) {
[stopTimer invalidate];
stopTimer = nil;
tableItems = [[NSMutableArray alloc] init];
startDate = [NSDate date];
lbl.text = @"00.00.00.0";
running = FALSE;
}
else{
[tableItems insertObject:timeString atIndex:0];
[tableview reloadData];
}
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return tableItems.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
//Step 1:Check whether if we can reuse a cell
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
//Step2: If there are no new cells to reuse,create a new one
if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:(UITableViewCellStyleDefault) reuseIdentifier:@"cell"];
}
//Step 3: Set the cell text content
cell.textLabel.text = [tableItems objectAtIndex:indexPath.row];
//Step 4: Return the row
return cell;
}
@end