选取器视图崩溃

Question

我想从UIPickerView中获得两个值，并将它们合并为一个字符串。我可以正确地获取它们，但当我尝试NSLog时，最后一个NSString中的合并一直与sigabrt崩溃。

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
UIPickerView *pickerView = (UIPickerView *)[actionSheet viewWithTag:101];
NSLog(@"Time:: %@%@",[dataArray objectAtIndex:[pickerView selectedRowInComponent:0]],[minArray objectAtIndex:[pickerView selectedRowInComponent:1]]);  
NSString *hour = [dataArray objectAtIndex:[pickerView selectedRowInComponent:0]];
NSLog(@"%@", hour);
NSString *minute = [minArray objectAtIndex:[pickerView selectedRowInComponent:1]];
NSLog(@"%@", minute);
NSString *totalTime = [totalTime stringByAppendingFormat:@"%@%@", hour, minute];
NSLog(@"%@", totalTime);
//[self.tableView reloadData];
}

Answer 1

声明中的totalTime在其自身的初始值设定项中使用。更改此行：

NSString *totalTime = [totalTime stringByAppendingFormat:@"%@%@", hour, minute];

到此行：

NSString *totalTime = [NSString stringWithFormat:@"%@%@", hour, minute];

Answer 2

NSString *totalTime = [hour stringByAppendingString:minute];  

将是一个简单的解决方案。