NSNumber格式化显示

NSNumber格式化显示主要用到的函数是：NSNumberFormatter，使用方法如下。

       //第一种显示方式    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];    formatter.numberStyle = NSNumberFormatterPercentStyle;    NSString *string = [formatter stringFromNumber:[NSNumber numberWithInt:0.5]];    NSLog(@"Formatted number string:%@",string);    //第二种显示方式    NSNumberFormatter *hereNumFormatter = [[NSNumberFormatter alloc] init];    [hereNumFormatter setNumberStyle:NSNumberFormatterPercentStyle];    NSString *str = [hereNumFormatter stringFromNumber:[NSNumber numberWithDouble:0.3333]];    NSLog(@"%@",str);