如何使用 NSNumberFormatter 从双精度数中截断 0.000 个零
好吧，如果我有一个双精度数，我该如何限制它或将数字截断为 1dp，因为我知道不需要查看它们
double a = 1.6;
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
NSString *numberAsString = [numberFormatter stringFromNumber:[NSNumber numberWithDouble:a]];
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
[numberFormatter setGeneratesDecimalNumbers:YES];
[numberFormatter setMaximumFractionDigits:1];
[numberFormatter setMinimumFractionDigits:1];
[numberFormatter setAlwaysShowsDecimalSeparator:YES];
NSLog(@"a raw: %f", a); //outputs 1.600000
myLabel.text = [NSString stringWithFormat:@"%@",numberAsString];
NSLog(@"Formatted a: %@", numberAsString); //outputs 2
[numberFormatter release];
所以问题是它四舍五入值并且不留下小数位，我正在尝试让它为 myLabel 输出 1.6。
Ok so if I have a double to begin with how do I limit it or truncate digits to 1dp since I know they're not needed to be viewed
double a = 1.6;
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
NSString *numberAsString = [numberFormatter stringFromNumber:[NSNumber numberWithDouble:a]];
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
[numberFormatter setGeneratesDecimalNumbers:YES];
[numberFormatter setMaximumFractionDigits:1];
[numberFormatter setMinimumFractionDigits:1];
[numberFormatter setAlwaysShowsDecimalSeparator:YES];
NSLog(@"a raw: %f", a); //outputs 1.600000
myLabel.text = [NSString stringWithFormat:@"%@",numberAsString];
NSLog(@"Formatted a: %@", numberAsString); //outputs 2
[numberFormatter release];
So the problem is it rounds the value and leaves no decimal place, I'm trying to get it to output just 1.6 for myLabel.
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我不确定，但您可以尝试使用
NSString *formatted = [NSString stringWithFormat:@"%.1f", a];，然后使用格式化的标签文本I am not sure but you can try with
NSString *formatted = [NSString stringWithFormat:@"%.1f", a];, then use the formatted as the label text