当我按下停止按钮来停止计时器时,它会重置为原始时间并再次开始倒计时。我到处都看了,发现的都是“无效”,而且不起作用。我希望当我点击停止时时间停止,并且标签显示原始时间。我还关闭了自动计数,因此我可以尝试释放,但它给了我一个错误:
0x10e20a5: movl 16(%edx), %edx EXC_BAD_ACCESS (code=2, address=0x10)
NSTimer *rockettTimer;
int rocketCount;
@interface FirstViewController ()
@property (strong, nonatomic) IBOutlet UILabel *rocketTimer;
- (IBAction)stopButton:(id)sender;
- (IBAction)startButton:(id)sender;
@end
@implementation FirstViewController
@synthesize rocketTimer;
-(void) rocketTimerRun{
rocketCount = rocketCount - 1;
int minuts = rocketCount / 60;
int seconds = rocketCount - (minuts * 60);
NSString *timerOutput = [NSString stringWithFormat:@"%d:%.2d", minuts, seconds];
rocketTimer.text = timerOutput;
}
- (IBAction)startButton:(id)sender {
rocketCount = 180;
rockettTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(rocketTimerRun) userInfo:nil repeats:YES];
- (IBAction)stopButton:(id)sender {
[rockettTimer invalidate];
//[rockettTimer release];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[self setRocketTimer:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
@end
最佳答案
我想您多次按下开始按钮。每次调用 startButton 函数时,它都会创建一个新的计时器并忘记旧的计时器。为了防止这种情况,我建议在创建新计时器之前立即放置一个[rockettTimer invalidate]
。
您还应该将 RockettTimer 初始化为零。更好的是,您应该将其作为该类的成员变量,因为现在您将无法拥有该类的多个实例。
关于objective-c - 如何停止 NSTimer,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12995101/