ios Objective-C 字符串格式化
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/7251454/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Objective-C string formatting
提问by Ben
Possible Duplicates:
Format string, integer with leading zeros
String Formatting Tricks/Docs
可能的重复项：
格式化字符串、带前导零的整数
字符串格式化技巧/文档
I have a really simple question but didn′t find document about.
我有一个非常简单的问题，但没有找到相关文件。
I am using this code :
我正在使用此代码：
NSString *fileName = [NSString stringWithFormat:@"0%i.mp3", i];
so the @"0%i.mp3" = 01.mp3, 02.mp3 ... 09.mp3 files
所以@"0%i.mp3" = 01.mp3, 02.mp3 ... 09.mp3 文件
My issue is I have this mp3 with a longer name like 01-thefirstsong.mp3 , 02-mysecondsong.mp3 ... 15-mylastsong.mp3
我的问题是我有这个 mp3 的名字更长，比如 01-thefirstsong.mp3 , 02-mysecondsong.mp3 ... 15-mylastsong.mp3
How can I write this like @"allmyfiles.mp3" ?
我怎么能写这个像@"allmyfiles.mp3"？
Regards
问候
回答by Mike Hay
If you use this
如果你使用这个
int i = 1;
NSString *name = @"thefirstsong";
NSString *filename = [NSString stringWithFormat:@"%0d-%@.mp3", i, name];
filenamewill contain 01-thefirstsong.mp3.
filename将包含01-thefirstsong.mp3.
%@is the placeholder for objectiveC strings (NSString).
%@是objectiveC 字符串（NSString）的占位符。
