Question

ten.textValue = [[NSMutableString alloc]init];
ten.textValue = [NSMutableString stringWithString:textField.text];

I am getting crash at second line.
ten.textValue is NSMutableString.

Answer 1

您创建<条码>。价值 = [[国家清单]init];, 您正在制造一个自己拥有的物体。

当你试图在下行一条路上加插座时,你正在制造一个自动释放的体。这混淆了汇编者,该汇编者正在报告“保留——这是已经分配的、拥有的物体”。

Instead:

if(ten.textValue)
{
    ten.textValue = [NSMutableString stringWithString: textField.text]};
}

Answer 2

您需要确保<代码>text不是nil 如果你通过,将予以复制,例如:

[NSMutableString stringWithString: textField.text ? textField.text : @""]

You should also eliminate the first line - it serves no purpose, because the allocated and assigned value gets overwritten immediately.