回答編集履歴
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アンダーラインに関する記述
answer
CHANGED
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@@ -1,10 +1,23 @@
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色を変えるにはTextAttributesを利用します
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TextAttributesを利用します
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```lang-objc
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UIBarButtonItem* button = [[UIBarButtonItem alloc]initWithTitle:@"ボタン" style:UIBarButtonItemStyleDone target:self action:@selector(action)];
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[button setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor
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[button setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor blueColor]} forState:UIControlStateNormal];
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self.navigationItem.rightBarButtonItem = button;
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```
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```
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NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle)
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で下線も引けるはずですが、うまく動作しませんでした。
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UIButtonを生成しUIBarbuttonとして入れ込む方法もあります
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```lang-objc
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UIButton*button2 = [UIButton buttonWithType:UIButtonTypeCustom];
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NSAttributedString*title = [[NSMutableAttributedString alloc] initWithString:@"ボタン" attributes:@{NSForegroundColorAttributeName:[UIColor blueColor],NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle)}];
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[button2 setAttributedTitle:title forState:UIControlStateNormal];
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[button2 sizeToFit];
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UIBarButtonItem*left = [[UIBarButtonItem alloc] initWithCustomView:button2];
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self.navigationItem.leftBarButtonItem = left;
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```
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