Question

Just like with Apples timer app, you can t select "0". You have to choose at least 1 hour or 1 minute. Here is how I m formatting the textfield for the picker..

//Formats the textfield based on the pickers.
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

NSString *result = [feetArray objectAtIndex:[feetPicker selectedRowInComponent:0]];

result = [result stringByAppendingFormat:@"%@ft", [feetArray objectAtIndex:[feetPicker selectedRowInComponent:1]]];
result = [result stringByAppendingFormat:@" %@", [inchArray objectAtIndex:[inchesPicker selectedRowInComponent:0]]];
result = [result stringByAppendingFormat:@"%@", [inchArray objectAtIndex:[inchesPicker selectedRowInComponent:1]]];
result = [result stringByAppendingFormat:@" %@in", [fractionArray objectAtIndex:[fractionPicker selectedRowInComponent:0]]];

RiseTextField.text = result;
}

如果他们选择“0”一切方式,我就希望脚步自动走到1位。我认为,我有3名仲裁员。 2个元件,2个 in组件,1个零件。因此,它在10f 09 1/16in等文本领域表现出来。

Answer 1

基本上,你想要做的是:假设零值包含零值。

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    if (([feetPicker selectedRowInComponent:0] == 0)&&
        ([feetPicker selectedRowInComponent:1] == 0)&&
        ([inchesPicker selectedRowInComponent:0] == 0)&&
        ([inchesPicker selectedRowInComponent:1] == 0)&&
        ([fractionPicker selectedRowInComponent:0] == 0)){
        // All values zero
        [feetPicker selectRow:1 
                  inComponent:1 
                     animated:YES];
        return;
    }
    // Handle valid value
}

在一份附带说明中,考虑使用<代码>NSMutableString>>。然后不创建新的<代码>NSString。每一行均可打电话<条码>。

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