在字符串的前面添加空格？

Question

我想在字符串前面添加空格("")(如空格).这是空间的长度

 int spaces_needed=((36-[[dicBusinessDetails objectForKey:@"ResturantName"] length]))/2;

我想要的是创建一个像这样的字符串

 NSString stringWithFormat:@"               %@",[dicBusinessDetails objectForKey:@"ResturantName"];

但空间应该NOT被如上固定的,但可变长度INT spaces_needed.

这样做的实际原因是在收据中居中对齐字符串

Answer 1

你可能会喜欢NSString的stringByPaddingToLength:withString:startingAtIndex

NSString *result = [NSString stringWithFormat:@"%@%@",
                             [@" " stringByPaddingToLength:spaces_needed withString:@" " startingAtIndex:0]
                             [dicBusinessDetails objectForKey:@"ResturantName"]];