Boxing of NSString stringWithFormat like NSNumber

问题

We can create an NSNumber like this

NSNumber *number = [NSNumber numberWithFloat:4.5];
//or
NSNumber *number = @(4.5);
//or
NSNumber *number = @4.5;

I know we can convert to an NSString with the following statement

NSString *string = @("stuff"); //equivalent of [NSString stringWithUTF8String]

However, can we create an NSString like this?

NSString *string = @(@"Name is:%@",name); //equivalent of [NSString stringWithFormat]

回答1:

This is just off the top of my head. I do not think there's any syntactic sugar for this.

Though, I believe you could achieve what you are looking for like this:

Put this in your .pch file

#define format(s, ...) 
[NSString stringWithFormat:s, ##__VA_ARGS__]

And call it :

NSString *s = format(@"%@, %@", @"a", @"b");

来源：https://stackoverflow.com/questions/24794816/boxing-of-nsstring-stringwithformat-like-nsnumber