iPhone実機テスト

この度、無事にシュミレーターで成功したカスタムキーボードを、実機テストしましたが、キーボードの切り替え項目は出るのですが、実際にキーボードが表示されず、一つ前のキーボード状態に戻ります。
シミュレーターと実機での違いってなんでしょうか？
追加のコードが必要ということでしょうか？


#import "KeyboardViewController.h"
#import "Keyboard.h"
@interface KeyboardViewController ()
@property (strong,nonatomic) Keyboard *keyboard;
@end

@implementation KeyboardViewController

- (void)updateViewConstraints {
    [super updateViewConstraints];
    
    // Add custom view sizing constraints here
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Perform custom UI setup here
    self.keyboard = [[[NSBundle mainBundle] loadNibNamed:@"Keyboard" owner:nil options:nil]objectAtIndex:0];
    [self addGesturesToKeyboard];
    self.inputView = self.keyboard;
    
}


- (void)viewWillLayoutSubviews
{
    [super viewWillLayoutSubviews];
}

- (void)textWillChange:(id<UITextInput>)textInput {
    // The app is about to change the document's contents. Perform any preparation here.
}

- (void)textDidChange:(id<UITextInput>)textInput {
    // The app has just changed the document's contents, the document context has been updated.
    
    UIColor *textColor = nil;
    if (self.textDocumentProxy.keyboardAppearance == UIKeyboardAppearanceDark) {
        textColor = [UIColor whiteColor];
    } else {
        textColor = [UIColor blackColor];
    }
}

#pragma mark Keyboards
- (void)addGesturesToKeyboard{
    [self.keyboard.deleteKey addTarget:self action:@selector(pressDeleteKey) forControlEvents:UIControlEventTouchUpInside];
        [self.keyboard.spaceKey addTarget:self action:@selector(pressSpaceKey) forControlEvents:UIControlEventTouchUpInside];
            [self.keyboard.returnKey addTarget:self action:@selector(pressReturnKey) forControlEvents:UIControlEventTouchUpInside];
   //Change to next keyboard
    [self.keyboard.globeKey addTarget:self action:@selector(advanceToNextInputMode) forControlEvents:UIControlEventTouchUpInside];

for (UIButton *Key in self.keyboard.keysArray) {
    [Key addTarget:self action:@selector(pressKey:) forControlEvents:UIControlEventTouchUpInside];}
     }
- (void)pressDeleteKey{
        [self.textDocumentProxy deleteBackward];
    }
-(void)pressSpaceKey{
    [self.textDocumentProxy insertText:@" "];
}
-(void)pressReturnKey{
        [self.textDocumentProxy insertText:@"\n"];}
     -(void)pressKey:(UIButton *)key{
    [self.textDocumentProxy insertText:[key currentTitle]];
     
     }

@end