IBOutlet NSMenuItem* item1;
IBOutlet NSMenuItem* item2;
IBOutlet NSMenuItem* item3;
IBOutlet NSMenuItem* item4;
if ([item1 state]) { // item1を選択済み
str3 = [str1 stringByAppendingString:str2];
[textView3 setString:str3];
} else if ([item2 state]) { // item2を選択済み
} else if ([item3 state]) { // item3を選択済み
str3 = [str1 stringByReplacingOccurrencesOfString:@"入力" withString:@"出力"];
[textView3 setString:str3];
} else { // item4を選択済み
str3 = [str1 stringByAppendingFormat:@"に含まれる文字数は%ld文字です。\n", [str1 length]];
str3 = [str3 stringByAppendingString:[str2 stringByAppendingFormat:@"に含まれる文字数は%ld文字です。", [str2 length]]];
[textView3 setString:str3];
}
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