我试图将NSString像“12000.54”转换成“12.000,54”.我写了一个NSNumberFormatter实例.
NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] autorelease]; [formatter setFormatterBehavior:NSNumberFormatterBehavior10_4]; [formatter setNumberStyle:NSNumberFormatterDecimalStyle]; [formatter setGroupingSeparator:@"."]; [formatter setDecimalSeparator:@","];
但是当我NSLog这个：
NSLog(@"%@",[formatter stringFromNumber:[formatter numberFromString:value]]);
它打印空值.如果我改变一个逗号,它的工作正常.我只想把我想要的分隔符字段(逗号,点,斜杠等)放在我身上,我有不同的输出：例如12 / 000,54 12.000.54 12,000,54.
你知道我能如何处理这个问题吗？
解决方法
我建议不要对分隔符进行硬编码,以确保基于iPhone区域设置的正确的分隔符行为.最简单的方法是：
使用目标c
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc]init]; numberFormatter.locale = [NSLocale currentLocale];// this ensures the right separator behavior numberFormatter.numberStyle = NSNumberFormatterDecimalStyle; numberFormatter.usesGroupingSeparator = YES; // example for writing the number object into a label cell.finalValueLabel.text = [NSString StringWithFormat:@"%@",[numberFormatter stringForObjectValue:numberFromString]]; // your var name is not well chosen
使用SWIFT 3
let formatter = NumberFormatter() formatter.locale = NSLocale.current // this ensures the right separator behavior formatter.numberStyle = NumberFormatter.Style.decimal formatter.usesGroupingSeparator = true // example for writing the number object into a label // your variable "numberFromString" needs to be a NSNumber object finalValueLabel.text = formatter.string(from: numberFromString)! // your var name is not well chosen
并且我不会使用var-name“numberFromString”,因为它是一个NSNumberFormatter方法.祝你好运！
