iOSTextField 千位分隔符带小数点后两位

默认支持小数点之前每三位用逗号分隔,可输入小数点,小数点后最多输入两位

#import 

@interface UITextField (MicrometerLevelFormat)
/*!
 *  @author ma dongkai, 16-03-15 18:03:03
 *
 *  @brief 打开数字千分位的开关，需要设置数字键盘、需要在
 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string中打开
 *
 *  @since 1.0
 */
- (void)openMicrometerLevelFormat;

//直接赋值的时候 手动调用此方法防止光标错位
- (void)reformatAsMicrometerLevel:(UITextField *)textField;
@end

import "UITextField+MicrometerLevelFormat.h"
#import 
@interface UITextField ()
@property (retain, nonatomic) UITextRange * textrange;
@property (retain, nonatomic) NSString * preString;
@end

@implementation UITextField (MicrometerLevelFormat)

static char kTextRange;
static char kPreString;

#pragma mark - method swizzle
- (void)setTextrange:(UITextRange *)textrange{
    objc_setAssociatedObject(self, &kTextRange, textrange, OBJC_ASSOCIATION_COPY);
}
- (UITextRange *)textrange{
   return objc_getAssociatedObject(self, &kTextRange);
}

- (void)setPreString:(NSString *)preString{
    objc_setAssociatedObject(self, &kPreString, preString, OBJC_ASSOCIATION_COPY);
}

- (NSString *)preString{
    return objc_getAssociatedObject(self, &kPreString);
}

#pragma mark - 千分位
//开启千分位模式
- (void)openMicrometerLevelFormat {
    
    [self addTarget:self action:@selector(reformatAsMicrometerLevel:) forControlEvents:UIControlEventEditingChanged];
    NSLog(@"++++ = %lu",(unsigned long)[[self allTargets] count]);
    [self configSelectedRange];
}


-(NSString*)formatString:(NSString*)replaceString
{
    
    if([replaceString rangeOfString:@"."].length == 0){
      NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
        numberFormatter.numberStyle = NSNumberFormatterDecimalStyle;
        NSString * formattedNumberString = [numberFormatter stringFromNumber:[NSNumber numberWithDouble:replaceString.doubleValue]];
        if ([replaceString isEqualToString:@""]) {
            return @"";
        }else{
            return formattedNumberString;
        }
    }else{
        NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
        numberFormatter.numberStyle = NSNumberFormatterDecimalStyle;
        NSString * formattedNumberString = [numberFormatter stringFromNumber:[NSNumber numberWithDouble:replaceString.doubleValue]];
        NSMutableString *resultStre = [[NSMutableString alloc]init];
        [resultStre appendString:formattedNumberString];

        
        if ([[replaceString substringFromIndex:replaceString.length-1] isEqualToString:@"."]) {
            [resultStre appendString:@"."];
        } else {
            NSString *pointStr = [replaceString componentsSeparatedByString:@"."][1];//点后面的数字
            if (pointStr.length >2) {
                return self.preString;
            }
            NSLog(@"%@",self.preString);
            return [NSString stringWithFormat:@"%@.%@",[resultStre componentsSeparatedByString:@"."][0],pointStr];
        }
//        if ((replaceString.length-1) - [replaceString rangeOfString:@"."].location == 0) {
//
//        }else if ((replaceString.length-1) - [replaceString rangeOfString:@"."].location > 2)
//        {
//
//            return self.preString;
//        }
        
        
        
        return resultStre;
    }
    
    
  
}
#pragma mark - private method
//千分位校验
- (void)reformatAsMicrometerLevel:(UITextField *)textField {
    NSString *replaceString = [textField.text stringByReplacingOccurrencesOfString:@"," withString:@""];
    
    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    
    //[numberFormatter setPositiveFormat:@"###,###.00"];
    numberFormatter.numberStyle = NSNumberFormatterDecimalStyle;
    
    NSString * formattedNumberString = [self formatString:replaceString];
    
    textField.text = formattedNumberString;
    
    textField.selectedTextRange = self.textrange;   //保证光标在逗号后时，删除功能正常
    
    NSString * beforeString = self.preString;
    NSString * afterString = formattedNumberString;
    
    NSInteger off ;
    UITextPosition *newPos;
    if([formattedNumberString rangeOfString:@"."].length == 0){
        if(beforeString.length - afterString.length == 1){//仅减一个数字
            off = -1;
            newPos = [textField positionFromPosition:self.textrange.start offset:off];
            textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
        }else if (beforeString.length - afterString.length == 2){//减一个数字  一个逗号
            off = -2;
            newPos = [textField positionFromPosition:self.textrange.start offset:off];
            textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
        }else if (beforeString.length - afterString.length == -1){//仅加一个数字
            off = 1;
            newPos = [textField positionFromPosition:self.textrange.end offset:off];
            textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
        }else if (beforeString.length-afterString.length == -2){//加一个数字  一个逗号
            off = 2;
            newPos = [textField positionFromPosition:self.textrange.start offset:off];
            textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
        }
    }else{
        //有小数点了
        NSString *lastChara = [afterString substringFromIndex:afterString.length-1];
        if (![lastChara isEqualToString:@"."]) {
            if(beforeString.length - afterString.length == 1){//仅减一个数字
                off = -1;
                newPos = [textField positionFromPosition:self.textrange.start offset:off];
                textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
            } if (beforeString.length - afterString.length == -1){//仅加一个数字
                off = 1;
                newPos = [textField positionFromPosition:self.textrange.end offset:off];
                textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
            }
        } else {
            if(beforeString.length - afterString.length == 1){//仅减一个数字
                off = -1;
                newPos = [textField positionFromPosition:self.textrange.start offset:off];
                textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
            } if (beforeString.length - afterString.length == -1){//仅加一个数字
                off = 1;
                newPos = [textField positionFromPosition:self.textrange.end offset:off];
                textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
            }
//            NSInteger offset = textField.text.length;
//            [textField setSelectedTextRange:[textField textRangeFromPosition:[textField positionFromPosition:textField.beginningOfDocument offset:offset] toPosition:[textField positionFromPosition:textField.beginningOfDocument offset:offset]]];
        }


    }
    
    
   
    
    self.preString = formattedNumberString;//把修改之后的赋值给prestring
}

- (void)configSelectedRange{
    UITextRange *selectedRange = [self selectedTextRange];
    [self textRange:selectedRange];
}
//传回光标的位置
- (void)textRange:(UITextRange *)range {
    self.textrange = range;
}
@end

使用方法:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    [textField openMicrometerLevelFormat];
    return YES;
}