输入的数字表示金额时，习惯三位数字进行一次区分，一般情况下常用“，”
用NSString的扩展类实现这个效果
#import <Foundation/Foundation.h>
@interface NSString (YT_character)
//字符串中的数字每3位增加一个 “逗号”
+ (NSMutableAttributedString *)stringBySeparatorForString:(NSString *)string;
@end
#import "NSString+YT_character.h"
@implementation NSString (YT_character)
//字符串的数字中间添加 “，”
+ (NSMutableAttributedString *)stringBySeparatorForString:(NSString *)num {
if (num == nil) {
num = @"0";
}
NSString *newString = [num stringByReplacingOccurrencesOfString:@"," withString:@""];
NSNumberFormatter *fomatter = [[NSNumberFormatter alloc] init];
[fomatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSString *formatterStr = [fomatter stringFromNumber:[NSNumber numberWithInteger:[newString integerValue]]];
NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"%@",formatterStr] attributes:nil];
return attString;
}
@end
控制器中使用的方法，使用监听事件的方式
[_zijinTextField addTarget:self action:@selector(textFiledTextChange:) forControlEvents:UIControlEventEditingChanged];
//text输入框数字区分
- (void)textFiledTextChange:(UITextField *)textfile {
textfile.attributedText = [NSString stringBySeparatorForString:textfile.text];
if ([textfile.text isEqualToString:@"0"]) {
textfile.text = @"";
}
}
