Ios UITextField inputView未在iPhone 6中显示

我有一个奇怪的bug，它只发生在Xcode 6的iPhone6模拟器中。我有一个通用组件，它扩展了UITextField，并在屏幕底部显示一个pickerView作为inputView

如果我使用iPhone5或iPhone5s来测试我的应用程序，它会按预期工作：inputView和inputAccessoryView显示正确。但若我切换到iPhone6或Plus模拟器，屏幕底部只会显示inputAccessoryView，而不会显示inputView

这是我的密码：

@interface DropDownTextField : UITextField

@property (strong,nonatomic) UIPickerView* pickerView;
@property (strong,nonatomic) UIToolbar *toolBar;
@property CGFloat originalFontSize;

@property (nonatomic) id<UIPickerViewDelegate> pickerDelegate;
@property (nonatomic) id<UIPickerViewDataSource> pickerDataSource;

- (CGFloat)requiredFontSize;
- (void)setDropdownMode:(BOOL)enabled;

@end

@implementation DropDownTextField

-(id)initWithCoder:(NSCoder *)aDecoder {
    if(self = [super initWithCoder:aDecoder]) {
        self.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
        self.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;

        [self setFont:[UIFont mediumRegular]];
        _originalFontSize = self.font.pointSize;

        self.layer.borderWidth = 1.0f;

        CGRect frame = [self frame];

        // rightview dropdown arrow
        UIImageView *dropDownImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, (frame.size.height-8)/2, 14.0f, 8.0f)];
        UIImage *dropDownImage = [UIImage imageNamed:@"DisclosureDown"];
        [dropDownImageView setImage:dropDownImage];
        dropDownImageView.contentMode = UIViewContentModeScaleAspectFit;
        UIView *dropDownView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 25.0f, frame.size.height)];
        [dropDownView addSubview:dropDownImageView];

        self.rightView = dropDownView;
        self.rightViewMode = UITextFieldViewModeAlways;
        [self.rightView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(becomeFirstResponder)]];

        // picker view
        _pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0,0,SCREEN_WIDTH,216)];
        _pickerView.showsSelectionIndicator = YES;
        [_pickerView setBackgroundColor:[UIColor colorWithRed:245/255.0 green:245/255.0 blue:245/255.0 alpha:1.0f]];
        self.inputView = _pickerView;

        // picker view toolbar
        _toolBar= [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,SCREEN_WIDTH,44)];
        [_toolBar setBackgroundColor:[UIColor colorWithRed:229/255.0 green:229/255.0 blue:229/255.0 alpha:1.0f]];
        [_toolBar setBarStyle:UIBarStyleBlackTranslucent];

        // to align button to the right
        UIBarButtonItem *flex = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];

        UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] init];
        [barButtonDone setTarget:self];
        [barButtonDone setAction:@selector(changeSelectionFromLabel:)];
        [barButtonDone setTitle:NSLocalizedString(@"ok", @"")];
        [barButtonDone setTintColor:[UIColor colorWithRed:229/255.0 green:229/255.0 blue:229/255.0 alpha:1.0f]];
        [barButtonDone setStyle:UIBarButtonItemStylePlain];
        [barButtonDone setTitleTextAttributes:[UIFont pickerTitleTextAttributes] forState:UIControlStateNormal];

        UIBarButtonItem *barButtonCancel = [[UIBarButtonItem alloc] init];
        [barButtonCancel setTarget:self];
        [barButtonCancel setAction:@selector(dismissPickerView:)];
        [barButtonCancel setTitle:NSLocalizedString(@"cancel", @"")];
        [barButtonCancel setTintColor:[UIColor colorWithRed:229/255.0 green:229/255.0 blue:229/255.0 alpha:1.0f]];
        [barButtonCancel setStyle:UIBarButtonItemStylePlain];
        [barButtonCancel setTitleTextAttributes:[UIFont pickerTitleTextAttributes] forState:UIControlStateNormal];

        self.toolBar.items = [[NSArray alloc] initWithObjects:barButtonCancel,flex,barButtonDone,nil];
        self.inputAccessoryView = _toolBar;


    }
    return self;
}

@interface DropDownTextField:UITextField
@属性（强，非原子）UIPickerView*pickerView；
@属性（强，非原子）UIToolbar*工具栏；
@属性CGFloat originalFontSize；
@属性（非原子）id pickerDelegate；
@属性（非原子）id pickerDataSource；
-（CGFloat）所需的字体大小；
-（void）setDropdownMode：（BOOL）已启用；
@结束
@实现DropDownTextField
-（id）initWithCoder:（NSCoder*）aDecoder{
if（self=[super initWithCoder:aDecoder]）{
self.contentVerticalAlignment=uicontrol contentVerticalAlignment中心；
self.contentHorizontalAlignment=uicontrol内容HorizontalAlignment右侧；
[self-setFont:[UIFont mediumRegular]]；
_originalFontSize=self.font.pointSize；
self.layer.borderWidth=1.0f；
CGRect帧=[自帧]；
//右视图下拉箭头
UIImageView*dropDownImageView=[[UIImageView alloc]initWithFrame:CGRectMake（0，（frame.size.height-8）/2,14.0f,8.0f）]；
UIImage*dropDownImage=[UIImage ImageName:@“DispositionDown”]；
[dropDownImageView设置图像：dropDownImage]；
dropDownImageView.contentMode=UIViewContentModeScaleAspectFit；
UIView*dropDownView=[[UIView alloc]initWithFrame:CGRectMake（0,0,25.0f，frame.size.height）]；
[dropDownView添加子视图：dropDownImageView]；
self.rightView=下拉视图；
self.rightViewMode=UITextFieldViewModeAlways；
[self.rightView addgestureRecognitzer:[[UITapgestureRecognitzer alloc]initWithTarget:self action:@selector（becomeFirstResponder）]；
//选择器视图
_pickerView=[[UIPickerView alloc]initWithFrame:CGRectMake（0,0，屏幕宽度，216）]；
_pickerView.showsSelectIndicator=是；
[_PickerViewSetBackgroundColor:[UIColor-WithRed:245/255.0绿色：245/255.0蓝色：245/255.0 alpha:1.0f]；
self.inputView=\u pickerView；
//选择器视图工具栏
_工具栏=[[UIToolbar alloc]initWithFrame:CGRectMake（0,0，屏幕宽度，44）]；
[_工具栏设置背景颜色：[UIColor color with red:229/255.0绿色：229/255.0蓝色：229/255.0 alpha:1.0f]；
[_工具栏setBarStyle:uiBarStyleBlack半透明]；
//将按钮向右对齐的步骤
UIBarButtonItem*flex=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarbuttonSystemFlexibleSpace目标：自我操作：nil]；
uibarbuttoneim*barbuttonone=[[uibarbuttoneim alloc]init]；
[BarbuttonOne setTarget:self]；
[BarbuttonOne设置操作：@selector（changeSelectionFromLabel:）]；
[BarbuttonOne设置标题：NSLocalizedString（@“ok”，@“）]；
[BarbuttonOne setTintColor:[UIColor颜色带红色：229/255.0绿色：229/255.0蓝色：229/255.0 alpha:1.0f]；
[BarbuttonOne设置样式：UIBarButtonItemStylePlain]；
[BarbuttonOne setTitleTextAttributes:[UIFont pickerTitleTextAttributes]用于状态：UIControlStateNormal]；
UIBarButtonItem*barButtonCancel=[[UIBarButtonItem alloc]init]；
[barButtonCancel设置目标：self]；
[barButtonCancel setAction:@selector（dismissPickerView:）]；
[barButtonCancel设置标题：NSLocalizedString（@“取消”，@“）]；
[barButtonCancel setTintColor:[UIColor WithRed:229/255.0 green:229/255.0 blue:229/255.0 alpha:1.0f]；
[barButtonCancel设置样式：UIBarButtonContimStyleplain]；
[barButtonCancel setTitleTextAttributes:[UIFont pickerTitleTextAttributes]用于状态：UIControlStateNormal]；
self.toolBar.items=[[NSArray alloc]initWithObjects:barButtonCancel、flex、barbuttonone、nil]；
self.inputAccessoryView=\u工具栏；
}
回归自我；
}

有人遇到过这样的问题吗？有什么解决办法吗

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PS：我已经尝试过清除构建目录、清理/重建项目、停止/重新启动模拟器和xcode方法。不工作。

尝试取消选中模拟器->硬件->键盘->连接硬件键盘

感谢您提供此答案