NSLog - 奇怪的行为
我发现最后一个单词用双引号显示。但为什么？
NSDictionary *guide2 = [NSDictionary dictionaryWithObjectsAndKeys:kArr, @"Kate", aArr, @"Ana-Lucia", kArr, @"John", nil];
NSArray *array = [guide2 allKeys];
NSLog(@"%@", [array description]);
输出：
(
John,
Kate,
"Ana-Lucia"
)
I found that last word showed with double quotes. But why?
NSDictionary *guide2 = [NSDictionary dictionaryWithObjectsAndKeys:kArr, @"Kate", aArr, @"Ana-Lucia", kArr, @"John", nil];
NSArray *array = [guide2 allKeys];
NSLog(@"%@", [array description]);
output:
(
John,
Kate,
"Ana-Lucia"
)
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评论（2）
看来是因为
Ana-Lucia键中的特殊字符-，所以它显示在双引号内。这可能是因为显示键是单个单词。如果您的密钥仅包含“AnaLucia”等字母，那么它将显示不带引号的键。如果键包含
字母以外的任何字符，即使它是下划线(_)或空格，该键也会显示在双引号中。It seems that because of the special character
-in the keyAna-Lucia, it displays it within double-quotes. May be this is because to show that the key is a single word. If your key contains onlyalphabetslike "AnaLucia", then it will display it without quotes.The key is displayed in double-quotes if it contains any characters other than
alphabets, even if it is anunderscore(_)orspace.因为它不是严格意义上的字母数字和一个单词。尝试 NSArray *array = [NSArray arrayWithObjects:@"abc", @"123", @"$abc", @"abc", @"ab c", nil];，你会只看到前两个没有引用。这只是编写描述代码的人的实现选择。
Because it's not strictly alphanumeric and one word only. Try
NSArray *array = [NSArray arrayWithObjects:@"abc", @"123", @"$abc", @"a-b-c", @"a b c", nil];, you'll see only the first two are not quoted. It's just an implementation choice from the guy who wrote the description code.