如何消除小數點後面的零

使用NSNumberFormatter

先看NSNumberFormatter簡介

如何抓出小數後面有幾位數

	+ (NSString*) removeTrialZero:(NSString*)strData
	{
	NSRange range = [strData rangeOfString:@"."];
	int digits;
	if (range.location != NSNotFound) {
	digits = [strData length];
	} else {
	range = [strData rangeOfString:@"e-"];
	if (range.location != NSNotFound) {
	digits = [strData intValue];
	} else {
	digits = 0;
	}
	}
	//小數後面沒有東西
	if (digits == 0) {
	return strData;
	}
	/*
	http://stackoverflow.com/questions/7469614/remove-more-than-2-trailing-zero
	*/
	NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
	[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
	//原來小數後面幾位數就保留幾位數
	[formatter setMaximumFractionDigits:digits];
	//小數後面最小零位，這樣就可以把多餘的0剔除了
	[formatter setMinimumFractionDigits:0];
	[formatter setUsesGroupingSeparator:YES];
	[formatter setGroupingSeparator:@","];
	[formatter setGroupingSize:3];
	NSNumber *strDataNumber = [formatter numberFromString:strData];
	if (strDataNumber == nil) {
	return nil;
	}
	NSString *resultString = [formatter stringFromNumber:strDataNumber];
	[formatter release];
	return resultString;
	}

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