基于定时函数的iOS标签文本

Question

我一直在尝试创建一个设置计时器的脚本，并在每次运行时将值减少33。理论上，计时器应在6次运行后自行停止，但它会继续运行并达到负值。有这个原因吗？

-(void)checkValue:(NSTimer *)myTimer{

    if(pplint > 0){
        pplint = pplint-33;
        NSString *ppllefttext = [NSString stringWithFormat:@"%d", pplint];
        peopleleft.text = ppllefttext;
        NSLog(@"Reduced Timer");   
    }
    if(pplint < 0){
        NSLog(@"Stop Timer");
        [myTimer invalidate];
    }
}


- (IBAction)gotocongrats{
    pplint = 198;
    NSString *ppllefttext = [NSString stringWithFormat:@"%d", pplint];
    peopleleft.text = ppllefttext;
    NSTimer * myTimer = [NSTimer scheduledTimerWithTimeInterval:1
                                                     target:self
                                                   selector:@selector(checkValue:)
                                                   userInfo:nil
                                                    repeats:YES];
    NSLog(@"Started Timer");
}

Answer 1

我带了你的代码并编辑了一下，它对我来说很好。

-(void)checkValue:(NSTimer *)myTimer{

if(pplint > 0){
    pplint = pplint-33;

    NSLog(@"%i",pplint);
    NSLog(@"Reduced Timer");   
}
if(pplint <= 0){
    NSLog(@"Stop Timer");
    [myTimer invalidate];
    }
}

- (IBAction)gotocongrats{
pplint = 198;


NSTimer * myTimer = [NSTimer scheduledTimerWithTimeInterval:1
                                                     target:self
                                                   selector:@selector(checkValue:)
                                                   userInfo:nil
                                                    repeats:YES];
NSLog(@"Started Timer");
}