#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
    NSString *string = @"  ffdsfmcbhvewifdcan   ";
    string = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    unsigned long len = string.length;
    NSString *string1 = [string substringToIndex:len-1];
    NSMutableString *str = [NSMutableString new];
    [str appendString:[NSString stringWithFormat:@"%@",string1]];
    [str appendFormat:@"*"];
    NSLog(@"-%@-",str);
    return 0;
}

马上就要学到了...

恩,你是谁啊?吴伟吗?

double-w 发表于 2017-6-12 22:33
马上就要学到了...

现在学会了吗?