我正在使用带有下一步和完成按钮的 inputAccessoryView 来帮助管理键盘。但是，我遇到了一个问题，当使用 resignFirstResponder 关闭键盘时，应用程序经常会因 EXC_BAD_ACCESS 错误而崩溃。

我使用的代码如下

- (void)keyboardNextClicked {
    int i = 0;
    for(ALFReportField *field in _reportfields) {
        UITextView *textView = field.txtvValue;
        if(textView.isFirstResponder) {
        if(_reportfields.count > i + 1){
                ALFReportField *nextField = _reportfields[i + 1];
                [nextField.txtvValue becomeFirstResponder];
            }
            else {
//                [textView performSelector:@selector(resignFirstResponder) withObject:nil afterDelay:0.125];
                [textView resignFirstResponder];
            }
            return;
        }
        i++;
    }
}

-(void)keyboardDoneClicked {
    for(ALFReportField *field in _reportfields) {
        UITextView *textView = field.txtvValue;
        if(textView.isFirstResponder) {
//            [textView performSelector:@selector(resignFirstResponder)  withObject:nil afterDelay:0.125];
            [textView resignFirstResponder];
            return;
        }
    }
}

注释行试图通过延迟 resignFirstResponder 调用(我在其他地方读到的解决方案)来解决问题，但没有奏效。

应用程序毫无问题地运行代码，直至返回，我的代码中没有出现任何错误。但是，就在它通过代码退出之后，我收到以下堆栈跟踪错误:

objc_retain + 10, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x1178f8b9)
    frame #0: 0x33b5067a libobjc.A.dylib`objc_retain + 10
    frame #1: 0x26c3e1fa UIKit`-[UIResponder _preserveResponderOverridesWhilePerforming:] + 122
    frame #2: 0x27125230 UIKit`-[UIInputWindowController invalidateInputAccessoryView] + 112
    frame #3: 0x27125b58 UIKit`-[UIInputWindowController changeToInputViewSet:] + 972
    frame #4: 0x271208a2 UIKit`__77-[UIInputWindowController moveFromPlacement:toPlacement:starting:completion:]_block_invoke886 + 414
    frame #5: 0x268e59b4 UIKit`-[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 540
    frame #6: 0x268e5494 UIKit`-[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 204
    frame #7: 0x268e538e UIKit`-[UIViewAnimationState animationDidStop:finished:] + 78
    frame #8: 0x2617aa50 QuartzCore`CA::Layer::run_animation_callbacks(void*) + 252
    frame #9: 0x3425bbd6 libdispatch.dylib`_dispatch_client_callout + 22
    frame #10: 0x34269f70 libdispatch.dylib`_dispatch_main_queue_callback_4CF$VARIANT$mp + 1524
    frame #11: 0x2277e96c CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
    frame #12: 0x2277ce66 CoreFoundation`__CFRunLoopRun + 1574
    frame #13: 0x226d0118 CoreFoundation`CFRunLoopRunSpecific + 520
    frame #14: 0x226cff04 CoreFoundation`CFRunLoopRunInMode + 108
    frame #15: 0x2b886ac8 GraphicsServices`GSEventRunModal + 160
    frame #16: 0x26912f14 UIKit`UIApplicationMain + 144
  * frame #17: 0x000eee44 Alfix app`main(argc=1, argv=0x00584a48) + 108 at main.m:14

有人知道出了什么问题吗？在此过程中，除了 resignFirstResponder 调用之外，我没有以任何方式、形状或形式接触 TextView 。再加上堆栈跟踪，我认为一定是 InputAccessoryView 导致了错误。

编辑:

输入附件 View 是通过 View Controller View 上的通用覆盖方法创建的:

- (UIView *)inputAccessoryView {
    CGRect frame = CGRectMake(0, 0, 320, 36);
    UIView *inputAccessoryView = [[UIView alloc] initWithFrame:frame];
    UIButton *btnNext = [inputAccessoryView addButton];
    UIButton *btnDone = [inputAccessoryView addButton];

    [inputAccessoryView setHeight:36];
    [btnNext topInset:0 leftInset:0 bottomInset:0];
    [btnNext rightOffset:0 to:btnDone];
    [btnDone topInset:0 rightInset:0 bottomInset:0];
    [btnNext setWidthEqualTo:btnDone];

    [inputAccessoryView setBackgroundColor:[UIColor colorWithHexString:@"#DCDFE3"]];

    [btnNext setTitle:@"Next" forState:UIControlStateNormal];
    [btnNext setTitleColor:kColorBlack forState:UIControlStateNormal];
    [btnDone setTitle:@"Done" forState:UIControlStateNormal];
    [btnDone setTitleColor:kColorBlack forState:UIControlStateNormal];

    [btnNext addTarget:self action:@selector(keyboardNextClicked) forControlEvents:UIControlEventTouchUpInside];
    [btnDone addTarget:self action:@selector(keyboardDoneClicked) forControlEvents:UIControlEventTouchUpInside];

    return inputAccessoryView;
}

最佳答案

事后看来，问题很明显。在创建输入附件 View 时，我将 IA View 传递给了键盘，但我自己并没有将其存储在任何地方。因此，当键盘关闭时，IA View 被释放，从而导致崩溃和错误消息。

当我第一次创建它时，将 inputAccessoryView 保存为一个属性，问题就很简单地解决了。

- (UIView *)inputAccessoryView {
    CGRect frame = CGRectMake(0, 0, 320, 36);
    _inputAccessoryView = [[UIView alloc] initWithFrame:frame];
    ...

然后当键盘关闭时它不会被释放，一切正常。

关于ios - InputAccessoryView 在 UITextview resignFirstResponder 上导致 EXC_BAD_ACCESS，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33670933/