ios常用的格式化代码工具

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1.NSByteCountFormatter 计算（格式化）文件的大小

 我们很多时候需要计算文件的大小，我看到很多人使用操蛋的公式，好吧！其实Apple官方提供了一套牛逼的API，这个API是将 ***文件字节数***转成对应的文件大小，注意是 ***文件字节数* **，类型是long long 别超过了，超过了你就有可能得到一个负数的值

    NSByteCountFormatter *format = [[NSByteCountFormatter alloc] init];    format.allowedUnits = NSByteCountFormatterUseMB; //以MB输出    format.countStyle = NSByteCountFormatterCountStyleBinary;//1024字节为1KB    format.includesUnit =  YES; /// 输出结果显示单位    format.includesCount = YES;  /// 输出结果显示数据    NSString *str = [format stringFromByteCount:4577781312988388823];    NSLog(@" %@ ",str);

2.NSDateFormatter 通过日期获取星期

我看过很多人写的代码，不管OC还是Java通过日期计算星期的时候，都不约而同的蛋疼的使用日历这个类，获取当日是一个星期的第几天，那么其实NSDateFormatter提供了格式化星期的方法，而且还包括国际化，也就是可以设置语言环境

 NSDateFormatter *format = [[NSDateFormatter alloc] init]; format.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"ja"]; // zh 输出：星期二 // us 输出：Tuesday // fr 输出：mardi // ru 输出：вторник // th 输出：วันอังคาร // ko 输出：화요일 // ja 输出：火曜日 [format setDateFormat:@"EEEE"]; NSString *str = [format stringFromDate:[NSDate date]]; NSLog(@" %@ ",str); [format setDateFormat:@"EEE"]; str = [format stringFromDate:[NSDate date]]; NSLog(@" %@ ",str);

这是objective-c的代码，Java里面跟这个是类似的，同样Java代码奉上

  SimpleDateFormat dateFormat = new SimpleDateFormat("EEEE",Locale.GERMAN);  String string = dateFormat.format(new Date());  System.out.println(string);

3.NSDateIntervalFormatter 两个日期范围格式化

这个用于两个日期，起始日期到终点日期；然后格式化这两个日期

 NSDateIntervalFormatter* formatter = [[NSDateIntervalFormatter alloc] init]; formatter.dateStyle = NSDateIntervalFormatterFullStyle; formatter.timeStyle = NSDateIntervalFormatterFullStyle; NSDate* startDate = [NSDate date]; NSDate* endDate = [NSDate dateWithTimeInterval:86400 sinceDate:startDate]; NSString* outputString = [formatter stringFromDate:startDate toDate:endDate]; NSLog(@" %@ ",outputString);

20XX年XX月XX日星期二中国标准时间下午X:XX:XX – 20XX年XX月XX日星期三中国标准时间下午XX:XX:XX

4.NSISO8601DateFormatter 格式化日期

我的理解是快速格式化日期或时间

NSISO8601DateFormatter *formatter = [[NSISO8601DateFormatter alloc] init];formatter.formatOptions = NSISO8601DateFormatWithInternetDateTime;NSString* outputString = [formatter stringFromDate:[NSDate date]];NSLog(@"#### %@  ####",outputString);

格式化输出日期或时间，可以把它理解为快速格式化日期

5.NSMassFormatter 质量格式化

直接上代码

   NSMassFormatter *formatter = [[NSMassFormatter alloc] init];// [formatter.numberFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh"]];  formatter.unitStyle = NSFormattingUnitStyleLong;  NSString *outputString1 = [formatter stringFromValue:200 unit:NSMassFormatterUnitGram];  /// 输出 200克  NSString *outputString2 = [formatter stringFromKilograms:200];  /// 输出 200千克   NSString *outputString3 = [formatter unitStringFromValue:33333.2 unit:NSMassFormatterUnitKilogram];  /// 输出 kilograms  NSMassFormatterUnit uko = NSMassFormatterUnitKilogram;  NSString *outputString4 = [formatter unitStringFromKilograms:200 usedUnit:&uko];        /// 输出 kilograms

6.NSLengthFormatter 长度格式化

格式化长度，直接上代码

NSLengthFormatter  *formatter = [[NSLengthFormatter alloc] init];formatter.unitStyle = NSFormattingUnitStyleLong;NSString *outputString1 = [formatter stringFromValue:200 unit:NSLengthFormatterUnitMeter];/// 输出 200克NSString *outputString2 = [formatter stringFromMeters:222];/// 输出 200千克NSString *outputString3 = [formatter unitStringFromValue:33333.2 unit:NSLengthFormatterUnitMeter];/// 输出 kilogramsNSLengthFormatterUnit uko = NSLengthFormatterUnitMeter;NSString *outputString4 = [formatter unitStringFromMeters:222 usedUnit:&uko];/// 输出 kilograms

7.NSEnergyFormatter 能量格式化

以焦耳为单位

NSEnergyFormatter *formatter = [[NSEnergyFormatter alloc] init];formatter.forFoodEnergyUse = YES;double value = 1000.0;NSString *outputString = [formatter stringFromJoules:value];

8.NSMeasurementFormatter 测量器

这个我会在以后跟量纲一起作写一篇一直，尽情期待！

9.NSPersonNameComponentsFormatter 名片格式化

在此忍不住黑一把三胖子，谁让他长得胖了

NSPersonNameComponentsFormatter *formatter = [[NSPersonNameComponentsFormatter alloc] init];NSPersonNameComponents *p = [[NSPersonNameComponents alloc] init];p.givenName = @"三胖";p.familyName = @"金";p.nameSuffix = @"先生";p.namePrefix = @"朝鲜领导人";p.nickname = @"三胖子";p.middleName = @"#";NSString *outputString1 =[formatter stringFromPersonNameComponents:p];// 金三胖formatter.style = NSPersonNameComponentsFormatterStyleLong;NSString *outputString2 =[formatter stringFromPersonNameComponents:p];//朝鲜领导人金三胖 # 先生

9.NSNumberFormatter 数字格式化比较重要的

数字格式化是可以根据不同的国家设置的

NSNumber *num1 = [NSNumber numberWithDouble:1234567.8369];NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];  // ==================== 类方法 ====================// 四舍五入的整数NSString *numberNoStyleStr                 = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterNoStyle];// 小数形式NSString *numberDecimalStyleStr            = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterDecimalStyle];// 货币形式 -- 本地化NSString *numberCurrencyStyleStr           = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyStyle];// 百分数形式NSString *numberPercentStyleStr            = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterPercentStyle];// 科学计数NSString *numberScientificStyleStr         = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterScientificStyle];// 朗读形式 -- 本地化NSString *numberSpellOutStyleStr           = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterSpellOutStyle];// 序数形式 -- 本地化NSString *numberOrdinalStyleStr            = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterOrdinalStyle];// 货币形式 ISO -- 本地化NSString *numberCurrencyISOStyleStr        = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyISOCodeStyle];// 货币形式 -- 本地化NSString *numberCurrencyPluralStyleStr     = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyPluralStyle];// 会计计数 -- 本地化NSString *numberCurrencyAccountingStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyAccountingStyle];NSLog(@"No Style= %@",numberNoStyleStr);                // No Style                  = 1234568NSLog(@"Decimal Style= %@",numberDecimalStyleStr);           // Decimal Style             = 1,234,567.837NSLog(@"Currency Style = %@",numberCurrencyStyleStr);          // Currency Style            = $1,234,567.84NSLog(@"Percent Style  = %@",numberPercentStyleStr);           // Percent Style             = 123,456,784%NSLog(@"Scientific Style = %@",numberScientificStyleStr);        // Scientific Style          = 1.2345678369E6// Spell Out Style           = one million two hundred thirty-four thousand five hundred sixty-seven point eight three six nineNSLog(@"Spell Out Style = %@",numberSpellOutStyleStr);NSLog(@"Ordinal Style = %@",numberOrdinalStyleStr);            // Ordinal Style             = 1,234,568thNSLog(@"Currency ISO Style = %@",numberCurrencyISOStyleStr);        // Currency ISO Style        = USD1,234,567.84NSLog(@"Currency plural Style     = %@",numberCurrencyPluralStyleStr);     // Currency plural Style     = 1,234,567.84 US dollarsNSLog(@"Currency accounting Style = %@",numberCurrencyAccountingStyleStr); // Currency accounting Style = $1,234,567.84// ==================== 定制 ====================NSNumberFormatter *numberFormatter = [NSNumberFormatter new];numberFormatter.numberStyle = NSNumberFormatterDecimalStyle;// 格式宽度numberFormatter.formatWidth = 15;// 填充符numberFormatter.paddingCharacter = @"?";// 填充位置numberFormatter.paddingPosition = kCFNumberFormatterPadBeforeSuffix;numberFormatter.positiveSuffix = @"元";NSLog(@"%@",[numberFormatter numberFromString:@"10000000元"]);  // 10000000// 缩放因子,你可以将一个数缩放指定比例,然后给其添加后缀,如传入一个3000,你希望表示为3千,就要用到这个属性// 防止影响后面的测试,故注掉//    numberFormatter.multiplier = @1000;    //    NSLog(@"%@千",[numberFormatter numberFromString:@"1000"]);  // 1千//    numberFormatter.multiplier     = @0.001;//    numberFormatter.positiveSuffix = @"千";//    NSLog(@"%@",[numberFormatter stringFromNumber:@10000]);    // 10千// 机制不明确,负号,正号//    numberFormatter.negativeFormat = @"^";//    numberFormatter.positiveFormat = @"~0";// 貌似没什么用numberFormatter.allowsFloats = NO;numberFormatter.alwaysShowsDecimalSeparator = NO;numberFormatter.maximum = @1000;numberFormatter.minimum = @100;// 小数点样式numberFormatter.decimalSeparator = @".";// 零的样式numberFormatter.zeroSymbol       = @"-";// 前缀和后缀numberFormatter.positivePrefix = @"!";numberFormatter.positiveSuffix = @"元";numberFormatter.negativePrefix = @"@";numberFormatter.negativeSuffix = @"亏";// 指定符号,与我们在前面类方法中说明的一致NSLog(@"货币代码%@",numberFormatter.currencyCode);                     // 货币代码USDNSLog(@"货币符号%@",numberFormatter.currencySymbol);                   // 货币符号$NSLog(@"国际货币符号%@",numberFormatter.internationalCurrencySymbol);   // 国际货币符号USDNSLog(@"百分比符号%@",numberFormatter.percentSymbol);                   // 百分比符号%NSLog(@"千分号符号%@",numberFormatter.perMillSymbol);                   // 千分号符号‰NSLog(@"减号符号%@",numberFormatter.minusSign);                         // 减号符号-NSLog(@"加号符号%@",numberFormatter.plusSign);                          // 加号符号+NSLog(@"指数符号%@",numberFormatter.exponentSymbol);                    // 指数符号E // 整数最多位数numberFormatter.maximumIntegerDigits = 10;     // 整数最少位数numberFormatter.minimumIntegerDigits = 2;// 小数位最多位数numberFormatter.maximumFractionDigits = 3;// 小数位最少位数numberFormatter.minimumFractionDigits = 1;// 数字分割的尺寸numberFormatter.groupingSize = 4;// 除了groupingSize决定的尺寸外,其他数字位分割的尺寸numberFormatter.secondaryGroupingSize = 2;// 最大有效数字个数numberFormatter.maximumSignificantDigits = 12;// 最少有效数字个数numberFormatter.minimumSignificantDigits = 3;NSLog(@"正数%@,负数%@",[numberFormatter stringFromNumber:@(+12135230.2346)],[numberFormatter stringFromNumber:@(-12135231.2346)]);  // 正数!12,13,5230.2346元,负数@12,13,5231.2346亏NSLog(@"零 = %@",[numberFormatter stringFromNumber:@(0)]); //  零 = -// 舍入值,比如以10为进位值,那么156就进位为160,154进位为150numberFormatter.roundingIncrement = @10;// 舍入方式numberFormatter.roundingMode = kCFNumberFormatterRoundHalfUp;NSLog(@"%@",[numberFormatter stringFromNumber:@123456.7890]);  // !12,3460元

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