帮助UISlider

Question

使用我的UISlider，如果我的值'tipPercentage'达到10或更多，标签'costWithTipLabel'将被设置回textField的'costWithoutTip'值，从10％的小费增加开始。

如果您能查看我的代码并让我知道导致此问题的问题，我将非常感激。

先谢谢。

- (IBAction)aSliderChanged:(id)sender {
    UISlider *slider = (UISlider *)sender;
    if (slider == tipslide) {
        NSString *tip = [NSString stringWithFormat:@"%.f", slider.value * 100];
        float tipPercentage = [tip floatValue];
        NSString *multiplier = [NSString stringWithFormat:@"1.%.f", tipPercentage];
        [costWithTipLabel setText:[NSString stringWithFormat:@"%.2f", [[costWithoutTip text] floatValue] * [multiplier floatValue]]];
        [tipTextLabel setText:[[NSString stringWithFormat:@"Tip (%.f", slider.value *100]stringByAppendingString:@"%):"]];
    }
    else if (slider == peopleslide) {
        NSString *p = [NSString stringWithFormat:@"%.f", slider.value*10];
        float numOfPeople = [p floatValue];
        [numberOfPeopleTextLabel setText:[NSString stringWithFormat:@"Each (%.f):", numOfPeople]];
        [numberOfPeopleLabel setText:[NSString stringWithFormat:@"%.2f", [[costWithTipLabel text] floatValue]/numOfPeople]];
    }
    [totalBillCost setText:[NSString stringWithFormat:@"%.2f", [[costWithTipLabel text] floatValue]]];
}

Answer 1

我希望它与字符串的意外格式有关。我建议你将stringWithFormat赋值分解为多个简单（非嵌套）语句，然后使用尽可能通用的格式（％f）NSLog值。然后你应该能够找出问题所在。