NSString stringWithFormat adding a percent [duplicate]

问题

This question already has an answer here:

• How to add percent sign to NSString 7 answers

How can I add a percent to my stringWithFormat function? For example, I'd like to have the following:

float someFloat = 40.233f;
NSString *str = [NSString stringWithFormat:@"%.02f%",someFloat];

This should cause the string to be:

40.23%

But it is not the case. How can I achieve this?

回答1:

% being the character beginning printf-style formats, it simply needs to be doubled:

float someFloat = 40.233f;
NSString *str = [NSString stringWithFormat:@"%.02f%%",someFloat];

回答2:

The escape code for a percent sign is “%%”, so your code would look like this

[NSString stringWithFormat:@"%d%%", someDigit];

This is also true for NSLog() and printf() formats.

Cited from How to add percent sign to NSString.

来源：https://stackoverflow.com/questions/4585904/nsstring-stringwithformat-adding-a-percent