objective-c - 格式化数字字符串，到多个尾随/数字/零

Question

我有一个简单的计算

float x = ([_enterValue.text floatValue]);
//known constant number
float y = (My value here);
[_resultTxt setText:[NSString stringWithFormat:@"%f", x * y]];

结果stringWithFormat有很多零，即。1.806700000000

我将如何去格式化这个所以我string的只是像 1.8

Answer 1

Try this:

[NSString stringWithFormat:@"%.1f", x * y]

The number after the decimal denotes the number of decimal places to be printed.