ios - 抑制不必要的零

Question

我想用 double 值创建一个带有 stringWithFormat 的字符串，最后没有不必要的零。

例子:

1. [NSString stringWithFormat:@"%.8f",2.344383933];

2. [NSString stringWithFormat:@"%.8f",2.0];

预期结果:

1. 2.344383933

2. 2

哪种格式是正确的？

谢谢。

Answer 1

使用NSNumberFormatter

[numberFormatter numberFromString:[NSString stringWithFormat:@"%.8f",0]]

示例:

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];

NSLog(@"1: %@",[numberFormatter numberFromString:[NSString stringWithFormat:@"%.8f",2.344383933]]);
NSLog(@"2: %@",[numberFormatter numberFromString:[NSString stringWithFormat:@"%.8f",2.0]]);

结果:

1: 2.344383933

2: 2