我试图通过使用计时器更新其值来每秒替换一个字符串。通常我可以很容易地替换一个 NSString
myString = [CCLabelTTF labelWithString:varyingParameterLabelString fontName:@"Helvetica" fontSize:14];
例如,但由于某种原因,它不会更新我的 NSString 的值。以下是我正在尝试做的事情。
@implementation Grid
{
NSTimer *timeRemainingTimer;
CCLabelTTF *_varyingParameterLabelValue;
}
-(void)setupLabels{
int timeRemaining = 30;
varyingParameterLabelValueString = [NSString stringWithFormat:@"%i", timeRemaining];
timeRemainingTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(decreaseTimeRemaining) userInfo:nil repeats:TRUE];
_varyingParameterLabelValue = [CCLabelTTF labelWithString:varyingParameterLabelValueString fontName:@"Helvetica" fontSize:20];
[self addChild:_varyingParameterLabelValue];
}
-(void)decreaseTimeRemaining{
timeRemaining--;
NSString *timeRemainingString = [NSString stringWithFormat:@"%i", timeRemaining];
_varyingParameterLabelValue = [CCLabelTTF labelWithString:@"timeRemainingString" fontName:@"Helvetica" fontSize:20];
//Still reads 30 after this runs
}
如果我只是将计时器方法的最后一行复制并粘贴到 setupLabels 方法中,它会像平常一样更改字符串,但在计时器方法内部它什么也不做。我已经登录以确保计时器正在运行,而且确实如此。谢谢您的帮助!