Question

我正在尝试制作一个等式（在x代码中），其中滑块值被假设除以100然后乘以文本字段值（由用户输入）。结果应该显示在另一个文本字段中。我的.h文件：

@property (weak, nonatomic) IBOutlet UISlider *slider;
@property (weak, nonatomic) IBOutlet UILabel *counter;
@property (weak, nonatomic) IBOutlet UILabel *label;
@property (weak, nonatomic) IBOutlet UITextField *numberfield1;
@property (weak, nonatomic) IBOutlet UITextField *numberfield2
- (IBAction)calculate:(id)sender;
- (IBAction)changeLabel;

我的.m文件：

- (IBAction)changeLabel {
    _counter.text = [[NSString alloc] initWithFormat:@"%1.f",_slider.value];
}

- (IBAction)calculate:(id)sender {
    float x = [_counter.text floatValue];
    float y = 100;
    float calc_result = x / y;
    float  calc_result2 = calc_result * _numberfield2; // (Invalid operand to binary expression ('float' and 'UITextField*'))
    self.numberfield2.text = [NSString stringWithFormat:@"%0.1f", calc_result2];
}

在（）中获取错误我做错了什么？我需要做些什么来修复它？还有其他缺陷吗？如果是这样我该怎么办呢？先谢谢！

Answer 1

试试这个：

- (IBAction)calculate:(id)sender {
    float x = [_counter.text floatValue];
    float y = 100;
    float calc_result = x / y;
    float numberField2Float = [_numberfield2.text floatValue]; //converts the string in the text field to a float
    float  calc_result2 = calc_result * numberField2Float;
    self.numberfield2.text = [NSString stringWithFormat:@"%0.1f", calc_result2];
}

滑块值不起作用的公式

1 个答案: