Question

我使用以下代码通过循环检查文本字段是否为空。下面是我的代码，它给出了以下错误。

-[UIImageView text]: unrecognized selector sent to instance 0x997c930

2014-03-19 16：54：49.227 IS [2837：a0b] * 由于未捕获的异常'NSInvalidArgumentException'终止应用程序，原因：' - [UIImageView text]：无法识别的选择器发送到实例0x997c930'

 //code

 NSString *strText;
 NSMutableArray *arrMsgs = [[NSMutableArray alloc] init];
[arrMsgs addObject:@"*Manifest Type is reuired."];
[arrMsgs addObject:@"*Suffix Code is required."];
[arrMsgs addObject:@"*Aircraft Registry is required."];
[arrMsgs addObject:@"*Flight Number is required."];
[arrMsgs addObject:@"*Embarkation ICAO/IATA required."];
[arrMsgs addObject:@"*ETD date (Local) is required."];
[arrMsgs addObject:@"*ETD Time (Local) is required."];
[arrMsgs addObject:@"*ETA date (Local) is required."];
[arrMsgs addObject:@"*ETA Time (Local) is required."];

NSLog(@"array:%d", [arrMsgs count]);
for(int i=1; i<=9;i++)
{
    UITextField *tf= (UITextField *)[self.view viewWithTag:i];
    int k=0;
    UILabel *lbl = (UILabel *)[self.view viewWithTag:k];
    if([tf.text length] == 0)
    {
        strText = [arrMsgs objectAtIndex:i-1];
        lbl.text = strText;
        NSLog(@"strText1:%@", strText);
        k++;
    }
}

我没有得到我错的地方，请指导以上。它在if条件下崩溃并出现上述错误。

Answer 1

此处k是integer value为0的{{1}}变量：

但是当你获取[self.view viewWithTag:k]时，它会UIImageView而不是UILabel。 Text property属UILabel而非UIImageView

使用UILabel检查其iskindOfClass是否与此类似：

id viewTag = [self.view viewWithTag:k];
if([viewTag iskindOfClass:[UIImageView class]])
   NSLog(@"image view");
else if([viewTag iskindOfClass:[UILabel class]])
   NSLog(@"label"); 
else if([viewTag iskindOfClass:[UITextField class]])
   NSLog(@"txtField"); 
else
    NSLog(@"%@",viewTag);

解决方案 add unique tag至UILabel，如999 or 9999 or 99999。

通过循环查找空文本字段

1 个答案: