Question

我有这样的代码。

else if ([controlIn isKindOfClass:UITextField.class]) {
    UITextField *cast = (UITextField *)controlIn;
    if (cast.inputView != NULL) {
        cast.text = [self setResolvedValue:cast metrixUIViewControllerIn:metrixUIViewControllerIn valueIn:valueIn];
    } else {
        cast.text = valueIn;
    }

但是在这个if (cast.inputView != NULL)行我得到了一个异常

“[NSPlaceholderMutableString initWithString：]：nil参数”

我的cast不是零。但是有什么理由得到这个错误。请帮我。感谢

更新

+ (NSString*) setResolvedValue:(UIView *)viewIn metrixUIViewControllerIn:(MetrixUIViewController *)metrixUIViewControllerIn valueIn:(NSString *)valueIn {
NSMutableString *resolvedValue = [NSMutableString stringWithString:valueIn];
if (![MetrixStringHelper isNullOrEmpty:valueIn] && [viewIn.inputView isKindOfClass:[UIPickerView class]]) {
    MetrixColumnDef *columnDef = [MetrixControlAssistant getColumnDefAssociatedToPicker:metrixUIViewControllerIn picker:(UIPickerView *)viewIn.inputView];
    NSString *uniqueName = [MetrixControlAssistant getUniqueNameAssociatedToPicker:metrixUIViewControllerIn picker:(UIPickerView *)viewIn.inputView];
    NSMutableArray *dataSet = [metrixUIViewControllerIn.pickerData objectForKey:uniqueName];
    for (NSDictionary *dictionary in dataSet) {
        if ([MetrixStringHelper value:valueIn isEqualTo:[dictionary objectForKey:columnDef.lookupDef.valueColumn]]) {
            resolvedValue = [dictionary objectForKey:columnDef.lookupDef.displayColumn];
            break;
        }
    }
}
return resolvedValue;

}

Answer 1

问题是因为初始化valueIn时resolvedValue为零。在使用valueIn初始化resolvedValue之前，请检查并确保+ (NSString*) setResolvedValue:(UIView *)viewIn metrixUIViewControllerIn:(MetrixUIViewController *)metrixUIViewControllerIn valueIn:(NSString *)valueIn { if ([MetrixStringHelper isNullOrEmpty:valueIn] || ![viewIn.inputView isKindOfClass:[UIPickerView class]]) { return @""; } NSMutableString *resolvedValue = [NSMutableString stringWithString:valueIn]; MetrixColumnDef *columnDef = [MetrixControlAssistant getColumnDefAssociatedToPicker:metrixUIViewControllerIn picker:(UIPickerView *)viewIn.inputView]; NSString *uniqueName = [MetrixControlAssistant getUniqueNameAssociatedToPicker:metrixUIViewControllerIn picker:(UIPickerView *)viewIn.inputView]; NSMutableArray *dataSet = [metrixUIViewControllerIn.pickerData objectForKey:uniqueName]; for (NSDictionary *dictionary in dataSet) { if ([MetrixStringHelper value:valueIn isEqualTo:[dictionary objectForKey:columnDef.lookupDef.valueColumn]]) { resolvedValue = [dictionary objectForKey:columnDef.lookupDef.displayColumn]; break; } } return resolvedValue; }不为零。

您应该查看Apple文档中的stringWithString:方法。

如果aString为nil，则引发NSInvalidArgumentException。

尝试使用以下代码替换您的方法

POST https://account.visualstudio.com/DefaultCollection/_apis/wit/wiql?api-version=1.0

[NSPlaceholderMutableString initWithString：]：在转换UITextField之后出现nil参数异常

1 个答案: