如果需要声明建议

Question

我想,当我输入大于200的值,显示一个警告UITextField,rcdAtIan.text.我试过这个:

 Self.rcdAtIan.text = self.circuit.rcdAtIan;
    if (_rcdAtIan.text > @"200");{
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Value Exceeded" message:@"Message here............." delegate:nil cancelButtonTitle: @"Ok" otherButtonTitles: nil];
           [alert show];

然后这个:

Self.rcdAtIan.text = self.circuit.rcdAtIan;
 if (self.circuit.rcdAtIan > @"200");{
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Value Exceeded" message:@"Message here.........." delegate:nil cancelButtonTitle: @"Ok" otherButtonTitles: nil];
           [alert show];
    }

但是加载视图时会显示警报,而不是我的if声明.我知道我想说的是什么if (_rcdAtIan.text => 200 "show my alert");- 但我不确定正确的语法.

Answer 1

您正尝试对2个字符串值执行算术比较.你需要做的是问:

if ([_rcdAtIan.text intValue] > 200) {...