问题描述
有人可以给出一个代码示例，说明如何在objective-c中正确填充NSString吗？
Can someone give a code example of how to right pad an NSString in objective-c please?
例如想要这些字符串：
Testing 123 Long String
Hello World
Short
如果右边填充到12的列宽：然后在每个末尾添加一个刺XXX，它将给出：
if right padded to a column width of say 12: and then a sting "XXX" is added to the end of each, it would give:
Testing 123 xxx
Hello World xxx
Short xxx
这是第二列想要的。
推荐答案
亚当走在正确的轨道上，但不完全在那里。你做想要使用+ stringWithFormat：，但不像他建议的那样。如果要将someString填充到（比如说）至少12个字符，则可以使用宽度说明符作为格式的一部分。由于您希望结果左对齐，因此您需要在宽度说明符前加一个减号：
Adam is on the right track, but not quite there. You do want to use +stringWithFormat:, but not quite as he suggested. If you want to pad "someString" to (say) a minimum of 12 characters, you'd use a width specifier as part of the format. Since you want the result to be left-justified, you need to precede the width specifier with a minus:
NSString *padded = [NSString stringWithFormat:@"%-12@", someString];
或者，如果您希望结果完全 12个字符，那么可以使用最小和最大宽度说明符：
Or, if you wanted the result to be exactly 12 characters, you can use both minimum and maximum width specifiers:
NSString *padded = [NSString stringWithFormat:@"%-12.12@", someString];
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