iOS开发之数字每隔3位用逗号分隔

demo: 源码下载：http://xiazai.jb51.net/201709/yuanma/dmlimtdemo_jb51.rar

之前做电商类app时，针对稍大的金额展示时，需要每隔千位添加逗号便于用户识别。

逻辑比较简单，这里按需要写了一个可选前后缀的一个转换方法：

#import "dmviewcontroller.h" 
 @interface dmviewcontroller () 
@property (weak, nonatomic) iboutlet uitextfield *titletext; 
@property (weak, nonatomic) iboutlet uilabel *numlab; 
@end 
@implementation dmviewcontroller 
- (ibaction)tapbuttonaction:(id)sender { 
 uibutton *tempbut = (uibutton *)sender; 
 if (tempbut.isselected) { 
 tempbut.selected = no; 
 _numlab.text = @"label"; 
 } else { 
 tempbut.selected = yes; 
 nsstring *newnumber = [self separatenumberusecommawith:_titletext.text]; 
 _numlab.text = newnumber; 
 } 
} 
// 将数字转为每隔3位整数由逗号“,”分隔的字符串 
- (nsstring *)separatenumberusecommawith:(nsstring *)number { 
 // 前缀 
 nsstring *prefix = @"￥"; 
 // 后缀 
 nsstring *suffix = @"元"; 
 // 分隔符 
 nsstring *divide = @","; 
 nsstring *integer = @""; 
 nsstring *radixpoint = @""; 
 bool contains = no; 
 if ([number containsstring:@"."]) { 
 contains = yes; 
 // 若传入浮点数，则需要将小数点后的数字分离出来 
 nsarray *comarray = [number componentsseparatedbystring:@"."]; 
 integer = [comarray firstobject]; 
 radixpoint = [comarray lastobject]; 
 } else { 
 integer = number; 
 } 
 // 将整数按各个字符为一组拆分成数组 
 nsmutablearray *integerarray = [[nsmutablearray alloc] init]; 
 for (int i = 0; i < integer.length; i ++) { 
 nsstring *substring = [integer substringwithrange:nsmakerange(i, 1)]; 
 [integerarray addobject:substring]; 
 } 
 // 将整数数组倒序每隔3个字符添加一个逗号“,” 
 nsstring *newnumber = @""; 
 for (nsinteger i = 0 ; i < integerarray.count ; i ++) { 
 nsstring *getstring = @""; 
 nsinteger index = (integerarray.count-1) - i; 
 if (integerarray.count > index) { 
  getstring = [integerarray objectatindex:index]; 
 } 
 bool result = yes; 
 if (index == 0 && integerarray.count%3 == 0) { 
  result = no; 
 } 
 if ((i+1)%3 == 0 && result) { 
  newnumber = [nsstring stringwithformat:@"%@%@%@",divide,getstring,newnumber]; 
 } else { 
  newnumber = [nsstring stringwithformat:@"%@%@",getstring,newnumber]; 
 } 
 } 
 if (contains) { 
 newnumber = [nsstring stringwithformat:@"%@.%@",newnumber,radixpoint]; 
 } 
 if (![prefix isequaltostring:@""]) { 
 newnumber = [nsstring stringwithformat:@"%@%@",prefix,newnumber]; 
 } 
 if (![suffix isequaltostring:@""]) { 
 newnumber = [nsstring stringwithformat:@"%@%@",newnumber,suffix]; 
 } 
 return newnumber; 
} 
@end 

  示意图：

总结

以上所述是小编给大家介绍的ios开发之数字每隔3位用逗号分隔，希望对大家有所帮助