点击UITextField时出现运行时错误

Question

每当我点击文本字段时都会遇到错误。我无法理解其含义。当我尝试在用户点击文本字段时加载viewController时会发生这种情况。

func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
        if textField == self.location {

            let vc = RquestDetailViewController()

            self.show(vc, sender: nil)
        }
        return false
}

错误

attribute, Arg[1] = [Closure Propagated : reabstraction thunk helper from @callee_owned (@unowned Swift.UnsafeBufferPointer<Swift.UInt8>) -> () to @callee_owned (@unowned Swift.UnsafeBufferPointer<Swift.UInt8>) -> (@out ()), Argument Types : [@callee_owned (@unowned Swift.UnsafeBufferPointer<Swift.UInt8>) -> ()]> of generic specialization <preserving fragile attribute, ()> of Swift.StaticString.withUTF8Buffer <A> ((Swift.UnsafeBufferPointer<Swift.UInt8>) -> A) -> A
->  0x102358014 <+120>: brk    #0x1

Answer 1

函数textFieldShouldBeginEditing用于在编辑之前检查前提条件。你错过了它的视图变化。这可能会导致textfield委托流中出现一些内部运行时错误。

尝试改为使用UIButton或UILabel & UITapGestureRecognizer。