componentsSeparatedByString返回错误的结果

Question

我用这段代码来剪切字符串

    NSString *titleString = @"22.225453615805794,113.554006577014889";
    NSArray *array = [titleString componentsSeparatedByString:@","];
    NSLog(@"title string %@", titleString);
    NSLog(@"first %.15f", [[array objectAtIndex:0] floatValue]);
    NSLog(@"second %.15f", [[array objectAtIndex:1] floatValue]);

但为什么它会回来

22.225454330444336和113.554008483886719

Answer 1

由于浮点数不准确,因此可以通过调用doubleValue而不是floatValue:

NSLog(@"second %.15f", [[array objectAtIndex:1] doubleValue]);

这不是问题componentsSeparatedByString:.