Question

华氏温度为NSObject，WakingTemperature为UIViewController。我正在更新从华氏度到WakingTemperature的选择器值（基本上是华氏和摄氏的两个对象来切换，我为华氏放置代码）。

现在我有问题恢复我的选择器值但是没有发生。这是我试过的在可更新，请帮助我。

@interface FertilityAppAppDelegate
----------------------------------
        NSInteger pickerRowCompzero;
        NSInteger pickerRowCompone;
        float valueConv;

        @property (nonatomic) NSInteger pickerRowCompzero;
        @property (nonatomic) NSInteger pickerRowCompone;
        @property (nonatomic) float valueConv;

@implementation FertilityAppAppDelegate
---------------------------------------
        @synthesize pickerRowCompzero,pickerRowCompone;
        @synthesize valueConv;

@implementation Fahrenheit
--------------------------
   - (id)init 
{        
 /* initialize data-arrays here */

 ArrayofTempIntegerofCelsius = [[NSMutableArray alloc] init];

 [ArrayofTempIntegerofCelsius addObject:@"36"];
 [ArrayofTempIntegerofCelsius addObject:@"37"];
 [ArrayofTempIntegerofCelsius addObject:@"38"];
 [ArrayofTempIntegerofCelsius addObject:@"39"];
 [ArrayofTempIntegerofCelsius addObject:@"40"];
 [ArrayofTempIntegerofCelsius addObject:@"41"];

 ArrayofbothTempfractional = [[NSMutableArray alloc] init];

 [ArrayofbothTempfractional addObject:@".0"];
 [ArrayofbothTempfractional addObject:@".1"];
 [ArrayofbothTempfractional addObject:@".2"];
 [ArrayofbothTempfractional addObject:@".3"];
 [ArrayofbothTempfractional addObject:@".4"];
 [ArrayofbothTempfractional addObject:@".5"];
 [ArrayofbothTempfractional addObject:@".6"];
 [ArrayofbothTempfractional addObject:@".7"];
 [ArrayofbothTempfractional addObject:@".8"];
 [ArrayofbothTempfractional addObject:@".9"];

 Appdelegate = (FertilityAppAppDelegate*)[[UIApplication sharedApplication] delegate];


 return self;             
}



    - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
    { 
        [self updateLabel];
    }

    -(void) updateLabel
    {
        Appdelegate.pickerRowCompzero=[pickerView selectedRowInComponent:0];
     Appdelegate.pickerRowCompone=[pickerView selectedRowInComponent:1];

     NSString *integer   = [ArrayofTempIntegerofFahrenheit objectAtIndex:Appdelegate.pickerRowCompzero];
     NSString *fraction  = [ArrayofbothTempfractional      objectAtIndex: Appdelegate.pickerRowCompone]; 

     NSString *fahrenheit  = [NSString stringWithFormat:@"%@%@",integer,fraction];
     Appdelegate.valueConv = [fahrenheit floatValue]; 

     label.text=[NSString stringWithFormat:@"%.1f",Appdelegate.valueConv];
     NSLog(@"float:%f ",Appdelegate.valueConv);

edit    // [pickerView reloadAllComponents];
    }

Answer 1

首先，为什么要在updateLabel结束时重新加载pickerview？

将您的选择器初始化为特定值xxx，您可以使用

[pickerView selectRow:xxx  inComponent:0 animated:FALSE]; // set default values

link text

上有一个关于无限选择器的好教程

Answer 2

从updateLabel

中删除

Appdelegate.pickerRowCompzero=[pickerView selectedRowInComponent:0];
Appdelegate.pickerRowCompone=[pickerView selectedRowInComponent:1];

在didSelectRow方法

中完成的更改

Appdelegate.pickerRowCompzero=[pickerView selectedRowInComponent:0];
Appdelegate.pickerRowCompone= [pickerView selectedRowInComponent:1];

如何恢复我的选择器值

2 个答案: