iflet_age =age.text.toInt() { //可以根据此种方法判断是否是int类型

var_age:Int =age.text.toInt()!

row.setValue(_age,forKey:"age")

}else{

UIAlertView(title:"提示",message:年龄必须为正数nil,cancelButtonTitle:确认").show()

.becomeFirstResponder()

return

}