去掉小数点后面的0

原创于 2016-12-14 17:43:04 发布 · 2k 阅读

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这篇博客介绍了如何使用NSString处理浮点数时，去除小数点后面多余的0，确保显示的数字格式正确。

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- (void)display{
    /**
     *  方法1（正则表达式）
     */
    NSString *regexZero = @"[0]$";
    NSString *regexDot = @"[.]$";
    NSPredicate *predZero = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regexZero];
    NSPredicate *predDot = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regexDot];
    while ([predZero evaluateWithObject:_numTemp] || [predDot evaluateWithObject:_numTemp]) {
        _numTemp = [_numTemp substringToIndex:_numTemp.length - 1];
    }
/**
      方法2    NSString * testNumber = _numTemp;
    NSString * outNumber = [NSStringstringWithFormat:@"%@",@(testNumber.floatValue)];

     **/
    /**     *  方法3     *///    while ([[_numTemp substringFromIndex:_numTemp.length - 1] isEqualToString:@"0"] || [[_numTemp substringFromIndex:_numTemp.length - 1] isEqualToString:@"."]) {//        _numTemp = [_numTemp substringToIndex:_numTemp.length - 1];//    }    [self.numDisplay setText:[NSString stringWithFormat:@"%@",_numTemp]];