• 我最近的项目中需要给服务器报送数据，但是在报送前需要先判断用户填写数据的正确性。我对oc不是特别熟悉，没有发现比较方便的方法，因此将我的解决方法记录下来，给需要的人，当然如果你有好方法，欢迎留言！
  关于正则表达式，请自行google!

NSString+FormValidation.h

#import <Foundation/Foundation.h>

@interface NSString (FormValidation)
//判断是否在0-99之间
- (BOOL)isValidBetween0_99;
//判断是否在0-999之间
- (BOOL)isValidBetween0_999;
//判断是否在1-15之间
- (BOOL)isValidBetween1_15;
//判断是否在0-99.9之间（支持 ".",".1"等）
- (BOOL)isValidBetween0_0_to_99_9;
@end

NSString+FormValidation.m

#import "NSString+FormValidation.h"

@implementation NSString (FormValidation)
- (BOOL)isValidBetween0_99 {
    NSError* error=nil;
    NSString* regex=@"^\\d{1,2}$";
    NSRegularExpression* reg=[NSRegularExpression regularExpressionWithPattern:regex options:NSRegularExpressionCaseInsensitive error:&error];
    NSArray* match =[reg matchesInString:self options:0 range:NSMakeRange(0, self.length)];
    NSLog(@"match count %li",match.count);
    if (match.count!=0) {
        return YES;
    }
    return NO;
}
- (BOOL)isValidBetween0_999 {
    NSError* error=nil;
    NSString* regex=@"^\\d{1,3}$";
    NSRegularExpression* reg=[NSRegularExpression regularExpressionWithPattern:regex options:NSRegularExpressionCaseInsensitive error:&error];
    NSArray* match =[reg matchesInString:self options:0 range:NSMakeRange(0, self.length)];
    NSLog(@"match count %li",match.count);
    if (match.count!=0) {
        return YES;
    }
    return NO;
}
- (BOOL)isValidBetween1_15
{
    NSError* error=nil;
    NSString* regex=@"^[0-1][0-5]$|^\\d$";
    NSRegularExpression* reg=[NSRegularExpression regularExpressionWithPattern:regex options:NSRegularExpressionCaseInsensitive error:&error];
    NSArray* match =[reg matchesInString:self options:0 range:NSMakeRange(0, self.length)];
    NSLog(@"match count %li",match.count);
    if (match.count!=0) {
        return YES;
    }
    return NO;
}
- (BOOL)isValidBetween0_0_to_99_9
{
    NSError* error=nil;
    NSString* regex=@"^\\d?\\.\\d?$|^\\d{2}\\.\\d?$|^\\d{1,2}$";
    NSRegularExpression* reg=[NSRegularExpression regularExpressionWithPattern:regex options:NSRegularExpressionCaseInsensitive error:&error];
    NSArray* match =[reg matchesInString:self options:0 range:NSMakeRange(0, self.length)];
    NSLog(@"match count %li",match.count);
    if (match.count!=0) {
        return YES;
    }
    return NO;
}
@end